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94e2996c717b-18 | "\n",
" ",
"",
]
elif language == Language.LATEX:
return [
# First, try to split along Latex sections
"\n\\\chapter{",
"\n\\\section{",
"\n\\\subsection{",
"\n\\\subsubsection{",
# Now split by environments
"\n\\\begin{enumerate}",
"\n\\\begin{itemize}",
"\n\\\begin{description}",
"\n\\\begin{list}",
"\n\\\begin{quote}",
"\n\\\begin{quotation}",
"\n\\\begin{verse}",
"\n\\\begin{verbatim}",
# Now split by math environments
"\n\\\begin{align}",
"$$",
"$",
# Now split by the normal type of lines
" ",
"",
]
elif language == Language.HTML:
return [
# First, try to split along HTML tags
"<body",
"<div",
"<p",
"<br",
"<li",
"<h1",
"<h2",
"<h3",
"<h4",
"<h5",
"<h6",
"<span",
"<table",
"<tr",
"<td",
"<th",
"<ul",
"<ol",
"<header",
"<footer",
"<nav",
# Head
"<head",
"<style",
"<script",
"<meta",
"<title",
"",
]
elif language == Language.SOL:
return [
# Split along compiler informations definitions
"\npragma ", | https://api.python.langchain.com/en/latest/_modules/langchain/text_splitter.html |
94e2996c717b-19 | return [
# Split along compiler informations definitions
"\npragma ",
"\nusing ",
# Split along contract definitions
"\ncontract ",
"\ninterface ",
"\nlibrary ",
# Split along method definitions
"\nconstructor ",
"\ntype ",
"\nfunction ",
"\nevent ",
"\nmodifier ",
"\nerror ",
"\nstruct ",
"\nenum ",
# Split along control flow statements
"\nif ",
"\nfor ",
"\nwhile ",
"\ndo while ",
"\nassembly ",
# Split by the normal type of lines
"\n\n",
"\n",
" ",
"",
]
else:
raise ValueError(
f"Language {language} is not supported! "
f"Please choose from {list(Language)}"
)
[docs]class NLTKTextSplitter(TextSplitter):
"""Implementation of splitting text that looks at sentences using NLTK."""
def __init__(self, separator: str = "\n\n", **kwargs: Any) -> None:
"""Initialize the NLTK splitter."""
super().__init__(**kwargs)
try:
from nltk.tokenize import sent_tokenize
self._tokenizer = sent_tokenize
except ImportError:
raise ImportError(
"NLTK is not installed, please install it with `pip install nltk`."
)
self._separator = separator
[docs] def split_text(self, text: str) -> List[str]:
"""Split incoming text and return chunks."""
# First we naively split the large input into a bunch of smaller ones.
splits = self._tokenizer(text) | https://api.python.langchain.com/en/latest/_modules/langchain/text_splitter.html |
94e2996c717b-20 | splits = self._tokenizer(text)
return self._merge_splits(splits, self._separator)
[docs]class SpacyTextSplitter(TextSplitter):
"""Implementation of splitting text that looks at sentences using Spacy."""
def __init__(
self, separator: str = "\n\n", pipeline: str = "en_core_web_sm", **kwargs: Any
) -> None:
"""Initialize the spacy text splitter."""
super().__init__(**kwargs)
try:
import spacy
except ImportError:
raise ImportError(
"Spacy is not installed, please install it with `pip install spacy`."
)
self._tokenizer = spacy.load(pipeline)
self._separator = separator
[docs] def split_text(self, text: str) -> List[str]:
"""Split incoming text and return chunks."""
splits = (str(s) for s in self._tokenizer(text).sents)
return self._merge_splits(splits, self._separator)
# For backwards compatibility
[docs]class PythonCodeTextSplitter(RecursiveCharacterTextSplitter):
"""Attempts to split the text along Python syntax."""
def __init__(self, **kwargs: Any) -> None:
"""Initialize a PythonCodeTextSplitter."""
separators = self.get_separators_for_language(Language.PYTHON)
super().__init__(separators=separators, **kwargs)
[docs]class MarkdownTextSplitter(RecursiveCharacterTextSplitter):
"""Attempts to split the text along Markdown-formatted headings."""
def __init__(self, **kwargs: Any) -> None:
"""Initialize a MarkdownTextSplitter."""
separators = self.get_separators_for_language(Language.MARKDOWN) | https://api.python.langchain.com/en/latest/_modules/langchain/text_splitter.html |
94e2996c717b-21 | separators = self.get_separators_for_language(Language.MARKDOWN)
super().__init__(separators=separators, **kwargs)
[docs]class LatexTextSplitter(RecursiveCharacterTextSplitter):
"""Attempts to split the text along Latex-formatted layout elements."""
def __init__(self, **kwargs: Any) -> None:
"""Initialize a LatexTextSplitter."""
separators = self.get_separators_for_language(Language.LATEX)
super().__init__(separators=separators, **kwargs) | https://api.python.langchain.com/en/latest/_modules/langchain/text_splitter.html |
9c176e0cb7c3-0 | Source code for langchain.requests
"""Lightweight wrapper around requests library, with async support."""
from contextlib import asynccontextmanager
from typing import Any, AsyncGenerator, Dict, Optional
import aiohttp
import requests
from pydantic import BaseModel, Extra
class Requests(BaseModel):
"""Wrapper around requests to handle auth and async.
The main purpose of this wrapper is to handle authentication (by saving
headers) and enable easy async methods on the same base object.
"""
headers: Optional[Dict[str, str]] = None
aiosession: Optional[aiohttp.ClientSession] = None
class Config:
"""Configuration for this pydantic object."""
extra = Extra.forbid
arbitrary_types_allowed = True
def get(self, url: str, **kwargs: Any) -> requests.Response:
"""GET the URL and return the text."""
return requests.get(url, headers=self.headers, **kwargs)
def post(self, url: str, data: Dict[str, Any], **kwargs: Any) -> requests.Response:
"""POST to the URL and return the text."""
return requests.post(url, json=data, headers=self.headers, **kwargs)
def patch(self, url: str, data: Dict[str, Any], **kwargs: Any) -> requests.Response:
"""PATCH the URL and return the text."""
return requests.patch(url, json=data, headers=self.headers, **kwargs)
def put(self, url: str, data: Dict[str, Any], **kwargs: Any) -> requests.Response:
"""PUT the URL and return the text."""
return requests.put(url, json=data, headers=self.headers, **kwargs)
def delete(self, url: str, **kwargs: Any) -> requests.Response: | https://api.python.langchain.com/en/latest/_modules/langchain/requests.html |
9c176e0cb7c3-1 | def delete(self, url: str, **kwargs: Any) -> requests.Response:
"""DELETE the URL and return the text."""
return requests.delete(url, headers=self.headers, **kwargs)
@asynccontextmanager
async def _arequest(
self, method: str, url: str, **kwargs: Any
) -> AsyncGenerator[aiohttp.ClientResponse, None]:
"""Make an async request."""
if not self.aiosession:
async with aiohttp.ClientSession() as session:
async with session.request(
method, url, headers=self.headers, **kwargs
) as response:
yield response
else:
async with self.aiosession.request(
method, url, headers=self.headers, **kwargs
) as response:
yield response
@asynccontextmanager
async def aget(
self, url: str, **kwargs: Any
) -> AsyncGenerator[aiohttp.ClientResponse, None]:
"""GET the URL and return the text asynchronously."""
async with self._arequest("GET", url, **kwargs) as response:
yield response
@asynccontextmanager
async def apost(
self, url: str, data: Dict[str, Any], **kwargs: Any
) -> AsyncGenerator[aiohttp.ClientResponse, None]:
"""POST to the URL and return the text asynchronously."""
async with self._arequest("POST", url, **kwargs) as response:
yield response
@asynccontextmanager
async def apatch(
self, url: str, data: Dict[str, Any], **kwargs: Any
) -> AsyncGenerator[aiohttp.ClientResponse, None]:
"""PATCH the URL and return the text asynchronously.""" | https://api.python.langchain.com/en/latest/_modules/langchain/requests.html |
9c176e0cb7c3-2 | """PATCH the URL and return the text asynchronously."""
async with self._arequest("PATCH", url, **kwargs) as response:
yield response
@asynccontextmanager
async def aput(
self, url: str, data: Dict[str, Any], **kwargs: Any
) -> AsyncGenerator[aiohttp.ClientResponse, None]:
"""PUT the URL and return the text asynchronously."""
async with self._arequest("PUT", url, **kwargs) as response:
yield response
@asynccontextmanager
async def adelete(
self, url: str, **kwargs: Any
) -> AsyncGenerator[aiohttp.ClientResponse, None]:
"""DELETE the URL and return the text asynchronously."""
async with self._arequest("DELETE", url, **kwargs) as response:
yield response
[docs]class TextRequestsWrapper(BaseModel):
"""Lightweight wrapper around requests library.
The main purpose of this wrapper is to always return a text output.
"""
headers: Optional[Dict[str, str]] = None
aiosession: Optional[aiohttp.ClientSession] = None
class Config:
"""Configuration for this pydantic object."""
extra = Extra.forbid
arbitrary_types_allowed = True
@property
def requests(self) -> Requests:
return Requests(headers=self.headers, aiosession=self.aiosession)
[docs] def get(self, url: str, **kwargs: Any) -> str:
"""GET the URL and return the text."""
return self.requests.get(url, **kwargs).text
[docs] def post(self, url: str, data: Dict[str, Any], **kwargs: Any) -> str: | https://api.python.langchain.com/en/latest/_modules/langchain/requests.html |
9c176e0cb7c3-3 | """POST to the URL and return the text."""
return self.requests.post(url, data, **kwargs).text
[docs] def patch(self, url: str, data: Dict[str, Any], **kwargs: Any) -> str:
"""PATCH the URL and return the text."""
return self.requests.patch(url, data, **kwargs).text
[docs] def put(self, url: str, data: Dict[str, Any], **kwargs: Any) -> str:
"""PUT the URL and return the text."""
return self.requests.put(url, data, **kwargs).text
[docs] def delete(self, url: str, **kwargs: Any) -> str:
"""DELETE the URL and return the text."""
return self.requests.delete(url, **kwargs).text
[docs] async def aget(self, url: str, **kwargs: Any) -> str:
"""GET the URL and return the text asynchronously."""
async with self.requests.aget(url, **kwargs) as response:
return await response.text()
[docs] async def apost(self, url: str, data: Dict[str, Any], **kwargs: Any) -> str:
"""POST to the URL and return the text asynchronously."""
async with self.requests.apost(url, **kwargs) as response:
return await response.text()
[docs] async def apatch(self, url: str, data: Dict[str, Any], **kwargs: Any) -> str:
"""PATCH the URL and return the text asynchronously."""
async with self.requests.apatch(url, **kwargs) as response:
return await response.text()
[docs] async def aput(self, url: str, data: Dict[str, Any], **kwargs: Any) -> str: | https://api.python.langchain.com/en/latest/_modules/langchain/requests.html |
9c176e0cb7c3-4 | """PUT the URL and return the text asynchronously."""
async with self.requests.aput(url, **kwargs) as response:
return await response.text()
[docs] async def adelete(self, url: str, **kwargs: Any) -> str:
"""DELETE the URL and return the text asynchronously."""
async with self.requests.adelete(url, **kwargs) as response:
return await response.text()
# For backwards compatibility
RequestsWrapper = TextRequestsWrapper | https://api.python.langchain.com/en/latest/_modules/langchain/requests.html |
d04e2872c89e-0 | Source code for langchain.schema
"""Common schema objects."""
from __future__ import annotations
from abc import ABC, abstractmethod
from dataclasses import dataclass
from typing import (
Any,
Dict,
Generic,
List,
NamedTuple,
Optional,
Sequence,
TypeVar,
Union,
)
from uuid import UUID
from pydantic import BaseModel, Field, root_validator
from langchain.load.serializable import Serializable
RUN_KEY = "__run"
[docs]def get_buffer_string(
messages: List[BaseMessage], human_prefix: str = "Human", ai_prefix: str = "AI"
) -> str:
"""Get buffer string of messages."""
string_messages = []
for m in messages:
if isinstance(m, HumanMessage):
role = human_prefix
elif isinstance(m, AIMessage):
role = ai_prefix
elif isinstance(m, SystemMessage):
role = "System"
elif isinstance(m, FunctionMessage):
role = "Function"
elif isinstance(m, ChatMessage):
role = m.role
else:
raise ValueError(f"Got unsupported message type: {m}")
message = f"{role}: {m.content}"
if isinstance(m, AIMessage) and "function_call" in m.additional_kwargs:
message += f"{m.additional_kwargs['function_call']}"
string_messages.append(message)
return "\n".join(string_messages)
[docs]@dataclass
class AgentAction:
"""Agent's action to take."""
tool: str
tool_input: Union[str, dict]
log: str
[docs]class AgentFinish(NamedTuple):
"""Agent's return value."""
return_values: dict | https://api.python.langchain.com/en/latest/_modules/langchain/schema.html |
d04e2872c89e-1 | """Agent's return value."""
return_values: dict
log: str
[docs]class Generation(Serializable):
"""Output of a single generation."""
text: str
"""Generated text output."""
generation_info: Optional[Dict[str, Any]] = None
"""Raw generation info response from the provider"""
"""May include things like reason for finishing (e.g. in OpenAI)"""
# TODO: add log probs
@property
def lc_serializable(self) -> bool:
"""This class is LangChain serializable."""
return True
[docs]class BaseMessage(Serializable):
"""Message object."""
content: str
additional_kwargs: dict = Field(default_factory=dict)
@property
@abstractmethod
def type(self) -> str:
"""Type of the message, used for serialization."""
@property
def lc_serializable(self) -> bool:
"""This class is LangChain serializable."""
return True
[docs]class HumanMessage(BaseMessage):
"""Type of message that is spoken by the human."""
example: bool = False
@property
def type(self) -> str:
"""Type of the message, used for serialization."""
return "human"
[docs]class AIMessage(BaseMessage):
"""Type of message that is spoken by the AI."""
example: bool = False
@property
def type(self) -> str:
"""Type of the message, used for serialization."""
return "ai"
[docs]class SystemMessage(BaseMessage):
"""Type of message that is a system message."""
@property
def type(self) -> str:
"""Type of the message, used for serialization."""
return "system" | https://api.python.langchain.com/en/latest/_modules/langchain/schema.html |
d04e2872c89e-2 | """Type of the message, used for serialization."""
return "system"
[docs]class FunctionMessage(BaseMessage):
name: str
@property
def type(self) -> str:
"""Type of the message, used for serialization."""
return "function"
[docs]class ChatMessage(BaseMessage):
"""Type of message with arbitrary speaker."""
role: str
@property
def type(self) -> str:
"""Type of the message, used for serialization."""
return "chat"
def _message_to_dict(message: BaseMessage) -> dict:
return {"type": message.type, "data": message.dict()}
[docs]def messages_to_dict(messages: List[BaseMessage]) -> List[dict]:
"""Convert messages to dict.
Args:
messages: List of messages to convert.
Returns:
List of dicts.
"""
return [_message_to_dict(m) for m in messages]
def _message_from_dict(message: dict) -> BaseMessage:
_type = message["type"]
if _type == "human":
return HumanMessage(**message["data"])
elif _type == "ai":
return AIMessage(**message["data"])
elif _type == "system":
return SystemMessage(**message["data"])
elif _type == "chat":
return ChatMessage(**message["data"])
else:
raise ValueError(f"Got unexpected type: {_type}")
[docs]def messages_from_dict(messages: List[dict]) -> List[BaseMessage]:
"""Convert messages from dict.
Args:
messages: List of messages (dicts) to convert.
Returns:
List of messages (BaseMessages).
""" | https://api.python.langchain.com/en/latest/_modules/langchain/schema.html |
d04e2872c89e-3 | Returns:
List of messages (BaseMessages).
"""
return [_message_from_dict(m) for m in messages]
[docs]class ChatGeneration(Generation):
"""Output of a single generation."""
text = ""
message: BaseMessage
@root_validator
def set_text(cls, values: Dict[str, Any]) -> Dict[str, Any]:
values["text"] = values["message"].content
return values
[docs]class RunInfo(BaseModel):
"""Class that contains all relevant metadata for a Run."""
run_id: UUID
[docs]class ChatResult(BaseModel):
"""Class that contains all relevant information for a Chat Result."""
generations: List[ChatGeneration]
"""List of the things generated."""
llm_output: Optional[dict] = None
"""For arbitrary LLM provider specific output."""
[docs]class LLMResult(BaseModel):
"""Class that contains all relevant information for an LLM Result."""
generations: List[List[Generation]]
"""List of the things generated. This is List[List[]] because
each input could have multiple generations."""
llm_output: Optional[dict] = None
"""For arbitrary LLM provider specific output."""
run: Optional[List[RunInfo]] = None
"""Run metadata."""
[docs] def flatten(self) -> List[LLMResult]:
"""Flatten generations into a single list."""
llm_results = []
for i, gen_list in enumerate(self.generations):
# Avoid double counting tokens in OpenAICallback
if i == 0:
llm_results.append(
LLMResult(
generations=[gen_list],
llm_output=self.llm_output,
)
) | https://api.python.langchain.com/en/latest/_modules/langchain/schema.html |
d04e2872c89e-4 | llm_output=self.llm_output,
)
)
else:
if self.llm_output is not None:
llm_output = self.llm_output.copy()
llm_output["token_usage"] = dict()
else:
llm_output = None
llm_results.append(
LLMResult(
generations=[gen_list],
llm_output=llm_output,
)
)
return llm_results
def __eq__(self, other: object) -> bool:
if not isinstance(other, LLMResult):
return NotImplemented
return (
self.generations == other.generations
and self.llm_output == other.llm_output
)
[docs]class PromptValue(Serializable, ABC):
[docs] @abstractmethod
def to_string(self) -> str:
"""Return prompt as string."""
[docs] @abstractmethod
def to_messages(self) -> List[BaseMessage]:
"""Return prompt as messages."""
[docs]class BaseMemory(Serializable, ABC):
"""Base interface for memory in chains."""
class Config:
"""Configuration for this pydantic object."""
arbitrary_types_allowed = True
@property
@abstractmethod
def memory_variables(self) -> List[str]:
"""Input keys this memory class will load dynamically."""
[docs] @abstractmethod
def load_memory_variables(self, inputs: Dict[str, Any]) -> Dict[str, Any]:
"""Return key-value pairs given the text input to the chain.
If None, return all memories
"""
[docs] @abstractmethod
def save_context(self, inputs: Dict[str, Any], outputs: Dict[str, str]) -> None: | https://api.python.langchain.com/en/latest/_modules/langchain/schema.html |
d04e2872c89e-5 | """Save the context of this model run to memory."""
[docs] @abstractmethod
def clear(self) -> None:
"""Clear memory contents."""
[docs]class BaseChatMessageHistory(ABC):
"""Base interface for chat message history
See `ChatMessageHistory` for default implementation.
"""
"""
Example:
.. code-block:: python
class FileChatMessageHistory(BaseChatMessageHistory):
storage_path: str
session_id: str
@property
def messages(self):
with open(os.path.join(storage_path, session_id), 'r:utf-8') as f:
messages = json.loads(f.read())
return messages_from_dict(messages)
def add_message(self, message: BaseMessage) -> None:
messages = self.messages.append(_message_to_dict(message))
with open(os.path.join(storage_path, session_id), 'w') as f:
json.dump(f, messages)
def clear(self):
with open(os.path.join(storage_path, session_id), 'w') as f:
f.write("[]")
"""
messages: List[BaseMessage]
[docs] def add_user_message(self, message: str) -> None:
"""Add a user message to the store"""
self.add_message(HumanMessage(content=message))
[docs] def add_ai_message(self, message: str) -> None:
"""Add an AI message to the store"""
self.add_message(AIMessage(content=message))
[docs] def add_message(self, message: BaseMessage) -> None:
"""Add a self-created message to the store"""
raise NotImplementedError
[docs] @abstractmethod
def clear(self) -> None: | https://api.python.langchain.com/en/latest/_modules/langchain/schema.html |
d04e2872c89e-6 | raise NotImplementedError
[docs] @abstractmethod
def clear(self) -> None:
"""Remove all messages from the store"""
[docs]class Document(Serializable):
"""Interface for interacting with a document."""
page_content: str
metadata: dict = Field(default_factory=dict)
[docs]class BaseRetriever(ABC):
"""Base interface for retrievers."""
[docs] @abstractmethod
def get_relevant_documents(self, query: str) -> List[Document]:
"""Get documents relevant for a query.
Args:
query: string to find relevant documents for
Returns:
List of relevant documents
"""
[docs] @abstractmethod
async def aget_relevant_documents(self, query: str) -> List[Document]:
"""Get documents relevant for a query.
Args:
query: string to find relevant documents for
Returns:
List of relevant documents
"""
# For backwards compatibility
Memory = BaseMemory
T = TypeVar("T")
[docs]class BaseLLMOutputParser(Serializable, ABC, Generic[T]):
[docs] @abstractmethod
def parse_result(self, result: List[Generation]) -> T:
"""Parse LLM Result."""
[docs]class BaseOutputParser(BaseLLMOutputParser, ABC, Generic[T]):
"""Class to parse the output of an LLM call.
Output parsers help structure language model responses.
"""
[docs] def parse_result(self, result: List[Generation]) -> T:
return self.parse(result[0].text)
[docs] @abstractmethod
def parse(self, text: str) -> T:
"""Parse the output of an LLM call. | https://api.python.langchain.com/en/latest/_modules/langchain/schema.html |
d04e2872c89e-7 | """Parse the output of an LLM call.
A method which takes in a string (assumed output of a language model )
and parses it into some structure.
Args:
text: output of language model
Returns:
structured output
"""
[docs] def parse_with_prompt(self, completion: str, prompt: PromptValue) -> Any:
"""Optional method to parse the output of an LLM call with a prompt.
The prompt is largely provided in the event the OutputParser wants
to retry or fix the output in some way, and needs information from
the prompt to do so.
Args:
completion: output of language model
prompt: prompt value
Returns:
structured output
"""
return self.parse(completion)
[docs] def get_format_instructions(self) -> str:
"""Instructions on how the LLM output should be formatted."""
raise NotImplementedError
@property
def _type(self) -> str:
"""Return the type key."""
raise NotImplementedError(
f"_type property is not implemented in class {self.__class__.__name__}."
" This is required for serialization."
)
[docs] def dict(self, **kwargs: Any) -> Dict:
"""Return dictionary representation of output parser."""
output_parser_dict = super().dict()
output_parser_dict["_type"] = self._type
return output_parser_dict
[docs]class NoOpOutputParser(BaseOutputParser[str]):
"""Output parser that just returns the text as is."""
@property
def lc_serializable(self) -> bool:
return True
@property
def _type(self) -> str:
return "default" | https://api.python.langchain.com/en/latest/_modules/langchain/schema.html |
d04e2872c89e-8 | @property
def _type(self) -> str:
return "default"
[docs] def parse(self, text: str) -> str:
return text
[docs]class OutputParserException(ValueError):
"""Exception that output parsers should raise to signify a parsing error.
This exists to differentiate parsing errors from other code or execution errors
that also may arise inside the output parser. OutputParserExceptions will be
available to catch and handle in ways to fix the parsing error, while other
errors will be raised.
"""
def __init__(
self,
error: Any,
observation: str | None = None,
llm_output: str | None = None,
send_to_llm: bool = False,
):
super(OutputParserException, self).__init__(error)
if send_to_llm:
if observation is None or llm_output is None:
raise ValueError(
"Arguments 'observation' & 'llm_output'"
" are required if 'send_to_llm' is True"
)
self.observation = observation
self.llm_output = llm_output
self.send_to_llm = send_to_llm
[docs]class BaseDocumentTransformer(ABC):
"""Base interface for transforming documents."""
[docs] @abstractmethod
def transform_documents(
self, documents: Sequence[Document], **kwargs: Any
) -> Sequence[Document]:
"""Transform a list of documents."""
[docs] @abstractmethod
async def atransform_documents(
self, documents: Sequence[Document], **kwargs: Any
) -> Sequence[Document]:
"""Asynchronously transform a list of documents.""" | https://api.python.langchain.com/en/latest/_modules/langchain/schema.html |
1b552510fc88-0 | Source code for langchain.document_transformers
"""Transform documents"""
from typing import Any, Callable, List, Sequence
import numpy as np
from pydantic import BaseModel, Field
from langchain.embeddings.base import Embeddings
from langchain.math_utils import cosine_similarity
from langchain.schema import BaseDocumentTransformer, Document
class _DocumentWithState(Document):
"""Wrapper for a document that includes arbitrary state."""
state: dict = Field(default_factory=dict)
"""State associated with the document."""
def to_document(self) -> Document:
"""Convert the DocumentWithState to a Document."""
return Document(page_content=self.page_content, metadata=self.metadata)
@classmethod
def from_document(cls, doc: Document) -> "_DocumentWithState":
"""Create a DocumentWithState from a Document."""
if isinstance(doc, cls):
return doc
return cls(page_content=doc.page_content, metadata=doc.metadata)
[docs]def get_stateful_documents(
documents: Sequence[Document],
) -> Sequence[_DocumentWithState]:
"""Convert a list of documents to a list of documents with state.
Args:
documents: The documents to convert.
Returns:
A list of documents with state.
"""
return [_DocumentWithState.from_document(doc) for doc in documents]
def _filter_similar_embeddings(
embedded_documents: List[List[float]], similarity_fn: Callable, threshold: float
) -> List[int]:
"""Filter redundant documents based on the similarity of their embeddings."""
similarity = np.tril(similarity_fn(embedded_documents, embedded_documents), k=-1)
redundant = np.where(similarity > threshold)
redundant_stacked = np.column_stack(redundant) | https://api.python.langchain.com/en/latest/_modules/langchain/document_transformers.html |
1b552510fc88-1 | redundant_stacked = np.column_stack(redundant)
redundant_sorted = np.argsort(similarity[redundant])[::-1]
included_idxs = set(range(len(embedded_documents)))
for first_idx, second_idx in redundant_stacked[redundant_sorted]:
if first_idx in included_idxs and second_idx in included_idxs:
# Default to dropping the second document of any highly similar pair.
included_idxs.remove(second_idx)
return list(sorted(included_idxs))
def _get_embeddings_from_stateful_docs(
embeddings: Embeddings, documents: Sequence[_DocumentWithState]
) -> List[List[float]]:
if len(documents) and "embedded_doc" in documents[0].state:
embedded_documents = [doc.state["embedded_doc"] for doc in documents]
else:
embedded_documents = embeddings.embed_documents(
[d.page_content for d in documents]
)
for doc, embedding in zip(documents, embedded_documents):
doc.state["embedded_doc"] = embedding
return embedded_documents
[docs]class EmbeddingsRedundantFilter(BaseDocumentTransformer, BaseModel):
"""Filter that drops redundant documents by comparing their embeddings."""
embeddings: Embeddings
"""Embeddings to use for embedding document contents."""
similarity_fn: Callable = cosine_similarity
"""Similarity function for comparing documents. Function expected to take as input
two matrices (List[List[float]]) and return a matrix of scores where higher values
indicate greater similarity."""
similarity_threshold: float = 0.95
"""Threshold for determining when two documents are similar enough
to be considered redundant."""
class Config:
"""Configuration for this pydantic object."""
arbitrary_types_allowed = True
[docs] def transform_documents( | https://api.python.langchain.com/en/latest/_modules/langchain/document_transformers.html |
1b552510fc88-2 | arbitrary_types_allowed = True
[docs] def transform_documents(
self, documents: Sequence[Document], **kwargs: Any
) -> Sequence[Document]:
"""Filter down documents."""
stateful_documents = get_stateful_documents(documents)
embedded_documents = _get_embeddings_from_stateful_docs(
self.embeddings, stateful_documents
)
included_idxs = _filter_similar_embeddings(
embedded_documents, self.similarity_fn, self.similarity_threshold
)
return [stateful_documents[i] for i in sorted(included_idxs)]
[docs] async def atransform_documents(
self, documents: Sequence[Document], **kwargs: Any
) -> Sequence[Document]:
raise NotImplementedError | https://api.python.langchain.com/en/latest/_modules/langchain/document_transformers.html |
8cfc73f54b33-0 | Source code for langchain.agents.loading
"""Functionality for loading agents."""
import json
import logging
from pathlib import Path
from typing import Any, List, Optional, Union
import yaml
from langchain.agents.agent import BaseMultiActionAgent, BaseSingleActionAgent
from langchain.agents.tools import Tool
from langchain.agents.types import AGENT_TO_CLASS
from langchain.base_language import BaseLanguageModel
from langchain.chains.loading import load_chain, load_chain_from_config
from langchain.utilities.loading import try_load_from_hub
logger = logging.getLogger(__file__)
URL_BASE = "https://raw.githubusercontent.com/hwchase17/langchain-hub/master/agents/"
def _load_agent_from_tools(
config: dict, llm: BaseLanguageModel, tools: List[Tool], **kwargs: Any
) -> Union[BaseSingleActionAgent, BaseMultiActionAgent]:
config_type = config.pop("_type")
if config_type not in AGENT_TO_CLASS:
raise ValueError(f"Loading {config_type} agent not supported")
agent_cls = AGENT_TO_CLASS[config_type]
combined_config = {**config, **kwargs}
return agent_cls.from_llm_and_tools(llm, tools, **combined_config)
def load_agent_from_config(
config: dict,
llm: Optional[BaseLanguageModel] = None,
tools: Optional[List[Tool]] = None,
**kwargs: Any,
) -> Union[BaseSingleActionAgent, BaseMultiActionAgent]:
"""Load agent from Config Dict."""
if "_type" not in config:
raise ValueError("Must specify an agent Type in config")
load_from_tools = config.pop("load_from_llm_and_tools", False)
if load_from_tools:
if llm is None: | https://api.python.langchain.com/en/latest/_modules/langchain/agents/loading.html |
8cfc73f54b33-1 | if load_from_tools:
if llm is None:
raise ValueError(
"If `load_from_llm_and_tools` is set to True, "
"then LLM must be provided"
)
if tools is None:
raise ValueError(
"If `load_from_llm_and_tools` is set to True, "
"then tools must be provided"
)
return _load_agent_from_tools(config, llm, tools, **kwargs)
config_type = config.pop("_type")
if config_type not in AGENT_TO_CLASS:
raise ValueError(f"Loading {config_type} agent not supported")
agent_cls = AGENT_TO_CLASS[config_type]
if "llm_chain" in config:
config["llm_chain"] = load_chain_from_config(config.pop("llm_chain"))
elif "llm_chain_path" in config:
config["llm_chain"] = load_chain(config.pop("llm_chain_path"))
else:
raise ValueError("One of `llm_chain` and `llm_chain_path` should be specified.")
if "output_parser" in config:
logger.warning(
"Currently loading output parsers on agent is not supported, "
"will just use the default one."
)
del config["output_parser"]
combined_config = {**config, **kwargs}
return agent_cls(**combined_config) # type: ignore
[docs]def load_agent(
path: Union[str, Path], **kwargs: Any
) -> Union[BaseSingleActionAgent, BaseMultiActionAgent]:
"""Unified method for loading a agent from LangChainHub or local fs."""
if hub_result := try_load_from_hub( | https://api.python.langchain.com/en/latest/_modules/langchain/agents/loading.html |
8cfc73f54b33-2 | if hub_result := try_load_from_hub(
path, _load_agent_from_file, "agents", {"json", "yaml"}
):
return hub_result
else:
return _load_agent_from_file(path, **kwargs)
def _load_agent_from_file(
file: Union[str, Path], **kwargs: Any
) -> Union[BaseSingleActionAgent, BaseMultiActionAgent]:
"""Load agent from file."""
# Convert file to Path object.
if isinstance(file, str):
file_path = Path(file)
else:
file_path = file
# Load from either json or yaml.
if file_path.suffix == ".json":
with open(file_path) as f:
config = json.load(f)
elif file_path.suffix == ".yaml":
with open(file_path, "r") as f:
config = yaml.safe_load(f)
else:
raise ValueError("File type must be json or yaml")
# Load the agent from the config now.
return load_agent_from_config(config, **kwargs) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/loading.html |
cacf3f41db8b-0 | Source code for langchain.agents.agent_types
from enum import Enum
[docs]class AgentType(str, Enum):
"""Enumerator with the Agent types."""
ZERO_SHOT_REACT_DESCRIPTION = "zero-shot-react-description"
REACT_DOCSTORE = "react-docstore"
SELF_ASK_WITH_SEARCH = "self-ask-with-search"
CONVERSATIONAL_REACT_DESCRIPTION = "conversational-react-description"
CHAT_ZERO_SHOT_REACT_DESCRIPTION = "chat-zero-shot-react-description"
CHAT_CONVERSATIONAL_REACT_DESCRIPTION = "chat-conversational-react-description"
STRUCTURED_CHAT_ZERO_SHOT_REACT_DESCRIPTION = (
"structured-chat-zero-shot-react-description"
)
OPENAI_FUNCTIONS = "openai-functions"
OPENAI_MULTI_FUNCTIONS = "openai-multi-functions" | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent_types.html |
10c3327965d4-0 | Source code for langchain.agents.initialize
"""Load agent."""
from typing import Any, Optional, Sequence
from langchain.agents.agent import AgentExecutor
from langchain.agents.agent_types import AgentType
from langchain.agents.loading import AGENT_TO_CLASS, load_agent
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.base import BaseCallbackManager
from langchain.tools.base import BaseTool
[docs]def initialize_agent(
tools: Sequence[BaseTool],
llm: BaseLanguageModel,
agent: Optional[AgentType] = None,
callback_manager: Optional[BaseCallbackManager] = None,
agent_path: Optional[str] = None,
agent_kwargs: Optional[dict] = None,
*,
tags: Optional[Sequence[str]] = None,
**kwargs: Any,
) -> AgentExecutor:
"""Load an agent executor given tools and LLM.
Args:
tools: List of tools this agent has access to.
llm: Language model to use as the agent.
agent: Agent type to use. If None and agent_path is also None, will default to
AgentType.ZERO_SHOT_REACT_DESCRIPTION.
callback_manager: CallbackManager to use. Global callback manager is used if
not provided. Defaults to None.
agent_path: Path to serialized agent to use.
agent_kwargs: Additional key word arguments to pass to the underlying agent
tags: Tags to apply to the traced runs.
**kwargs: Additional key word arguments passed to the agent executor
Returns:
An agent executor
"""
tags_ = list(tags) if tags else []
if agent is None and agent_path is None:
agent = AgentType.ZERO_SHOT_REACT_DESCRIPTION | https://api.python.langchain.com/en/latest/_modules/langchain/agents/initialize.html |
10c3327965d4-1 | agent = AgentType.ZERO_SHOT_REACT_DESCRIPTION
if agent is not None and agent_path is not None:
raise ValueError(
"Both `agent` and `agent_path` are specified, "
"but at most only one should be."
)
if agent is not None:
if agent not in AGENT_TO_CLASS:
raise ValueError(
f"Got unknown agent type: {agent}. "
f"Valid types are: {AGENT_TO_CLASS.keys()}."
)
tags_.append(agent.value if isinstance(agent, AgentType) else agent)
agent_cls = AGENT_TO_CLASS[agent]
agent_kwargs = agent_kwargs or {}
agent_obj = agent_cls.from_llm_and_tools(
llm, tools, callback_manager=callback_manager, **agent_kwargs
)
elif agent_path is not None:
agent_obj = load_agent(
agent_path, llm=llm, tools=tools, callback_manager=callback_manager
)
try:
# TODO: Add tags from the serialized object directly.
tags_.append(agent_obj._agent_type)
except NotImplementedError:
pass
else:
raise ValueError(
"Somehow both `agent` and `agent_path` are None, "
"this should never happen."
)
return AgentExecutor.from_agent_and_tools(
agent=agent_obj,
tools=tools,
callback_manager=callback_manager,
tags=tags_,
**kwargs,
) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/initialize.html |
45339159c89f-0 | Source code for langchain.agents.agent
"""Chain that takes in an input and produces an action and action input."""
from __future__ import annotations
import asyncio
import json
import logging
import time
from abc import abstractmethod
from pathlib import Path
from typing import Any, Callable, Dict, List, Optional, Sequence, Tuple, Union
import yaml
from pydantic import BaseModel, root_validator
from langchain.agents.agent_types import AgentType
from langchain.agents.tools import InvalidTool
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.base import BaseCallbackManager
from langchain.callbacks.manager import (
AsyncCallbackManagerForChainRun,
AsyncCallbackManagerForToolRun,
CallbackManagerForChainRun,
CallbackManagerForToolRun,
Callbacks,
)
from langchain.chains.base import Chain
from langchain.chains.llm import LLMChain
from langchain.input import get_color_mapping
from langchain.prompts.base import BasePromptTemplate
from langchain.prompts.few_shot import FewShotPromptTemplate
from langchain.prompts.prompt import PromptTemplate
from langchain.schema import (
AgentAction,
AgentFinish,
BaseMessage,
BaseOutputParser,
OutputParserException,
)
from langchain.tools.base import BaseTool
from langchain.utilities.asyncio import asyncio_timeout
logger = logging.getLogger(__name__)
[docs]class BaseSingleActionAgent(BaseModel):
"""Base Agent class."""
@property
def return_values(self) -> List[str]:
"""Return values of the agent."""
return ["output"]
[docs] def get_allowed_tools(self) -> Optional[List[str]]:
return None
[docs] @abstractmethod
def plan(
self, | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-1 | return None
[docs] @abstractmethod
def plan(
self,
intermediate_steps: List[Tuple[AgentAction, str]],
callbacks: Callbacks = None,
**kwargs: Any,
) -> Union[AgentAction, AgentFinish]:
"""Given input, decided what to do.
Args:
intermediate_steps: Steps the LLM has taken to date,
along with observations
callbacks: Callbacks to run.
**kwargs: User inputs.
Returns:
Action specifying what tool to use.
"""
[docs] @abstractmethod
async def aplan(
self,
intermediate_steps: List[Tuple[AgentAction, str]],
callbacks: Callbacks = None,
**kwargs: Any,
) -> Union[AgentAction, AgentFinish]:
"""Given input, decided what to do.
Args:
intermediate_steps: Steps the LLM has taken to date,
along with observations
callbacks: Callbacks to run.
**kwargs: User inputs.
Returns:
Action specifying what tool to use.
"""
@property
@abstractmethod
def input_keys(self) -> List[str]:
"""Return the input keys.
:meta private:
"""
[docs] def return_stopped_response(
self,
early_stopping_method: str,
intermediate_steps: List[Tuple[AgentAction, str]],
**kwargs: Any,
) -> AgentFinish:
"""Return response when agent has been stopped due to max iterations."""
if early_stopping_method == "force":
# `force` just returns a constant string
return AgentFinish( | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-2 | # `force` just returns a constant string
return AgentFinish(
{"output": "Agent stopped due to iteration limit or time limit."}, ""
)
else:
raise ValueError(
f"Got unsupported early_stopping_method `{early_stopping_method}`"
)
[docs] @classmethod
def from_llm_and_tools(
cls,
llm: BaseLanguageModel,
tools: Sequence[BaseTool],
callback_manager: Optional[BaseCallbackManager] = None,
**kwargs: Any,
) -> BaseSingleActionAgent:
raise NotImplementedError
@property
def _agent_type(self) -> str:
"""Return Identifier of agent type."""
raise NotImplementedError
[docs] def dict(self, **kwargs: Any) -> Dict:
"""Return dictionary representation of agent."""
_dict = super().dict()
_type = self._agent_type
if isinstance(_type, AgentType):
_dict["_type"] = str(_type.value)
else:
_dict["_type"] = _type
return _dict
[docs] def save(self, file_path: Union[Path, str]) -> None:
"""Save the agent.
Args:
file_path: Path to file to save the agent to.
Example:
.. code-block:: python
# If working with agent executor
agent.agent.save(file_path="path/agent.yaml")
"""
# Convert file to Path object.
if isinstance(file_path, str):
save_path = Path(file_path)
else:
save_path = file_path
directory_path = save_path.parent
directory_path.mkdir(parents=True, exist_ok=True)
# Fetch dictionary to save | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-3 | directory_path.mkdir(parents=True, exist_ok=True)
# Fetch dictionary to save
agent_dict = self.dict()
if save_path.suffix == ".json":
with open(file_path, "w") as f:
json.dump(agent_dict, f, indent=4)
elif save_path.suffix == ".yaml":
with open(file_path, "w") as f:
yaml.dump(agent_dict, f, default_flow_style=False)
else:
raise ValueError(f"{save_path} must be json or yaml")
[docs] def tool_run_logging_kwargs(self) -> Dict:
return {}
[docs]class BaseMultiActionAgent(BaseModel):
"""Base Agent class."""
@property
def return_values(self) -> List[str]:
"""Return values of the agent."""
return ["output"]
[docs] def get_allowed_tools(self) -> Optional[List[str]]:
return None
[docs] @abstractmethod
def plan(
self,
intermediate_steps: List[Tuple[AgentAction, str]],
callbacks: Callbacks = None,
**kwargs: Any,
) -> Union[List[AgentAction], AgentFinish]:
"""Given input, decided what to do.
Args:
intermediate_steps: Steps the LLM has taken to date,
along with observations
callbacks: Callbacks to run.
**kwargs: User inputs.
Returns:
Actions specifying what tool to use.
"""
[docs] @abstractmethod
async def aplan(
self,
intermediate_steps: List[Tuple[AgentAction, str]],
callbacks: Callbacks = None,
**kwargs: Any,
) -> Union[List[AgentAction], AgentFinish]: | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-4 | **kwargs: Any,
) -> Union[List[AgentAction], AgentFinish]:
"""Given input, decided what to do.
Args:
intermediate_steps: Steps the LLM has taken to date,
along with observations
callbacks: Callbacks to run.
**kwargs: User inputs.
Returns:
Actions specifying what tool to use.
"""
@property
@abstractmethod
def input_keys(self) -> List[str]:
"""Return the input keys.
:meta private:
"""
[docs] def return_stopped_response(
self,
early_stopping_method: str,
intermediate_steps: List[Tuple[AgentAction, str]],
**kwargs: Any,
) -> AgentFinish:
"""Return response when agent has been stopped due to max iterations."""
if early_stopping_method == "force":
# `force` just returns a constant string
return AgentFinish({"output": "Agent stopped due to max iterations."}, "")
else:
raise ValueError(
f"Got unsupported early_stopping_method `{early_stopping_method}`"
)
@property
def _agent_type(self) -> str:
"""Return Identifier of agent type."""
raise NotImplementedError
[docs] def dict(self, **kwargs: Any) -> Dict:
"""Return dictionary representation of agent."""
_dict = super().dict()
_dict["_type"] = str(self._agent_type)
return _dict
[docs] def save(self, file_path: Union[Path, str]) -> None:
"""Save the agent.
Args:
file_path: Path to file to save the agent to.
Example:
.. code-block:: python | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-5 | Example:
.. code-block:: python
# If working with agent executor
agent.agent.save(file_path="path/agent.yaml")
"""
# Convert file to Path object.
if isinstance(file_path, str):
save_path = Path(file_path)
else:
save_path = file_path
directory_path = save_path.parent
directory_path.mkdir(parents=True, exist_ok=True)
# Fetch dictionary to save
agent_dict = self.dict()
if save_path.suffix == ".json":
with open(file_path, "w") as f:
json.dump(agent_dict, f, indent=4)
elif save_path.suffix == ".yaml":
with open(file_path, "w") as f:
yaml.dump(agent_dict, f, default_flow_style=False)
else:
raise ValueError(f"{save_path} must be json or yaml")
[docs] def tool_run_logging_kwargs(self) -> Dict:
return {}
[docs]class AgentOutputParser(BaseOutputParser):
[docs] @abstractmethod
def parse(self, text: str) -> Union[AgentAction, AgentFinish]:
"""Parse text into agent action/finish."""
[docs]class LLMSingleActionAgent(BaseSingleActionAgent):
llm_chain: LLMChain
output_parser: AgentOutputParser
stop: List[str]
@property
def input_keys(self) -> List[str]:
return list(set(self.llm_chain.input_keys) - {"intermediate_steps"})
[docs] def dict(self, **kwargs: Any) -> Dict:
"""Return dictionary representation of agent."""
_dict = super().dict()
del _dict["output_parser"]
return _dict
[docs] def plan( | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-6 | return _dict
[docs] def plan(
self,
intermediate_steps: List[Tuple[AgentAction, str]],
callbacks: Callbacks = None,
**kwargs: Any,
) -> Union[AgentAction, AgentFinish]:
"""Given input, decided what to do.
Args:
intermediate_steps: Steps the LLM has taken to date,
along with observations
callbacks: Callbacks to run.
**kwargs: User inputs.
Returns:
Action specifying what tool to use.
"""
output = self.llm_chain.run(
intermediate_steps=intermediate_steps,
stop=self.stop,
callbacks=callbacks,
**kwargs,
)
return self.output_parser.parse(output)
[docs] async def aplan(
self,
intermediate_steps: List[Tuple[AgentAction, str]],
callbacks: Callbacks = None,
**kwargs: Any,
) -> Union[AgentAction, AgentFinish]:
"""Given input, decided what to do.
Args:
intermediate_steps: Steps the LLM has taken to date,
along with observations
callbacks: Callbacks to run.
**kwargs: User inputs.
Returns:
Action specifying what tool to use.
"""
output = await self.llm_chain.arun(
intermediate_steps=intermediate_steps,
stop=self.stop,
callbacks=callbacks,
**kwargs,
)
return self.output_parser.parse(output)
[docs] def tool_run_logging_kwargs(self) -> Dict:
return {
"llm_prefix": "",
"observation_prefix": "" if len(self.stop) == 0 else self.stop[0],
} | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-7 | }
[docs]class Agent(BaseSingleActionAgent):
"""Class responsible for calling the language model and deciding the action.
This is driven by an LLMChain. The prompt in the LLMChain MUST include
a variable called "agent_scratchpad" where the agent can put its
intermediary work.
"""
llm_chain: LLMChain
output_parser: AgentOutputParser
allowed_tools: Optional[List[str]] = None
[docs] def dict(self, **kwargs: Any) -> Dict:
"""Return dictionary representation of agent."""
_dict = super().dict()
del _dict["output_parser"]
return _dict
[docs] def get_allowed_tools(self) -> Optional[List[str]]:
return self.allowed_tools
@property
def return_values(self) -> List[str]:
return ["output"]
def _fix_text(self, text: str) -> str:
"""Fix the text."""
raise ValueError("fix_text not implemented for this agent.")
@property
def _stop(self) -> List[str]:
return [
f"\n{self.observation_prefix.rstrip()}",
f"\n\t{self.observation_prefix.rstrip()}",
]
def _construct_scratchpad(
self, intermediate_steps: List[Tuple[AgentAction, str]]
) -> Union[str, List[BaseMessage]]:
"""Construct the scratchpad that lets the agent continue its thought process."""
thoughts = ""
for action, observation in intermediate_steps:
thoughts += action.log
thoughts += f"\n{self.observation_prefix}{observation}\n{self.llm_prefix}"
return thoughts
[docs] def plan(
self, | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-8 | return thoughts
[docs] def plan(
self,
intermediate_steps: List[Tuple[AgentAction, str]],
callbacks: Callbacks = None,
**kwargs: Any,
) -> Union[AgentAction, AgentFinish]:
"""Given input, decided what to do.
Args:
intermediate_steps: Steps the LLM has taken to date,
along with observations
callbacks: Callbacks to run.
**kwargs: User inputs.
Returns:
Action specifying what tool to use.
"""
full_inputs = self.get_full_inputs(intermediate_steps, **kwargs)
full_output = self.llm_chain.predict(callbacks=callbacks, **full_inputs)
return self.output_parser.parse(full_output)
[docs] async def aplan(
self,
intermediate_steps: List[Tuple[AgentAction, str]],
callbacks: Callbacks = None,
**kwargs: Any,
) -> Union[AgentAction, AgentFinish]:
"""Given input, decided what to do.
Args:
intermediate_steps: Steps the LLM has taken to date,
along with observations
callbacks: Callbacks to run.
**kwargs: User inputs.
Returns:
Action specifying what tool to use.
"""
full_inputs = self.get_full_inputs(intermediate_steps, **kwargs)
full_output = await self.llm_chain.apredict(callbacks=callbacks, **full_inputs)
return self.output_parser.parse(full_output)
[docs] def get_full_inputs(
self, intermediate_steps: List[Tuple[AgentAction, str]], **kwargs: Any
) -> Dict[str, Any]:
"""Create the full inputs for the LLMChain from intermediate steps.""" | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-9 | """Create the full inputs for the LLMChain from intermediate steps."""
thoughts = self._construct_scratchpad(intermediate_steps)
new_inputs = {"agent_scratchpad": thoughts, "stop": self._stop}
full_inputs = {**kwargs, **new_inputs}
return full_inputs
@property
def input_keys(self) -> List[str]:
"""Return the input keys.
:meta private:
"""
return list(set(self.llm_chain.input_keys) - {"agent_scratchpad"})
@root_validator()
def validate_prompt(cls, values: Dict) -> Dict:
"""Validate that prompt matches format."""
prompt = values["llm_chain"].prompt
if "agent_scratchpad" not in prompt.input_variables:
logger.warning(
"`agent_scratchpad` should be a variable in prompt.input_variables."
" Did not find it, so adding it at the end."
)
prompt.input_variables.append("agent_scratchpad")
if isinstance(prompt, PromptTemplate):
prompt.template += "\n{agent_scratchpad}"
elif isinstance(prompt, FewShotPromptTemplate):
prompt.suffix += "\n{agent_scratchpad}"
else:
raise ValueError(f"Got unexpected prompt type {type(prompt)}")
return values
@property
@abstractmethod
def observation_prefix(self) -> str:
"""Prefix to append the observation with."""
@property
@abstractmethod
def llm_prefix(self) -> str:
"""Prefix to append the LLM call with."""
[docs] @classmethod
@abstractmethod
def create_prompt(cls, tools: Sequence[BaseTool]) -> BasePromptTemplate:
"""Create a prompt for this class."""
@classmethod | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-10 | """Create a prompt for this class."""
@classmethod
def _validate_tools(cls, tools: Sequence[BaseTool]) -> None:
"""Validate that appropriate tools are passed in."""
pass
@classmethod
@abstractmethod
def _get_default_output_parser(cls, **kwargs: Any) -> AgentOutputParser:
"""Get default output parser for this class."""
[docs] @classmethod
def from_llm_and_tools(
cls,
llm: BaseLanguageModel,
tools: Sequence[BaseTool],
callback_manager: Optional[BaseCallbackManager] = None,
output_parser: Optional[AgentOutputParser] = None,
**kwargs: Any,
) -> Agent:
"""Construct an agent from an LLM and tools."""
cls._validate_tools(tools)
llm_chain = LLMChain(
llm=llm,
prompt=cls.create_prompt(tools),
callback_manager=callback_manager,
)
tool_names = [tool.name for tool in tools]
_output_parser = output_parser or cls._get_default_output_parser()
return cls(
llm_chain=llm_chain,
allowed_tools=tool_names,
output_parser=_output_parser,
**kwargs,
)
[docs] def return_stopped_response(
self,
early_stopping_method: str,
intermediate_steps: List[Tuple[AgentAction, str]],
**kwargs: Any,
) -> AgentFinish:
"""Return response when agent has been stopped due to max iterations."""
if early_stopping_method == "force":
# `force` just returns a constant string
return AgentFinish( | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-11 | # `force` just returns a constant string
return AgentFinish(
{"output": "Agent stopped due to iteration limit or time limit."}, ""
)
elif early_stopping_method == "generate":
# Generate does one final forward pass
thoughts = ""
for action, observation in intermediate_steps:
thoughts += action.log
thoughts += (
f"\n{self.observation_prefix}{observation}\n{self.llm_prefix}"
)
# Adding to the previous steps, we now tell the LLM to make a final pred
thoughts += (
"\n\nI now need to return a final answer based on the previous steps:"
)
new_inputs = {"agent_scratchpad": thoughts, "stop": self._stop}
full_inputs = {**kwargs, **new_inputs}
full_output = self.llm_chain.predict(**full_inputs)
# We try to extract a final answer
parsed_output = self.output_parser.parse(full_output)
if isinstance(parsed_output, AgentFinish):
# If we can extract, we send the correct stuff
return parsed_output
else:
# If we can extract, but the tool is not the final tool,
# we just return the full output
return AgentFinish({"output": full_output}, full_output)
else:
raise ValueError(
"early_stopping_method should be one of `force` or `generate`, "
f"got {early_stopping_method}"
)
[docs] def tool_run_logging_kwargs(self) -> Dict:
return {
"llm_prefix": self.llm_prefix,
"observation_prefix": self.observation_prefix,
}
class ExceptionTool(BaseTool):
name = "_Exception" | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-12 | }
class ExceptionTool(BaseTool):
name = "_Exception"
description = "Exception tool"
def _run(
self,
query: str,
run_manager: Optional[CallbackManagerForToolRun] = None,
) -> str:
return query
async def _arun(
self,
query: str,
run_manager: Optional[AsyncCallbackManagerForToolRun] = None,
) -> str:
return query
[docs]class AgentExecutor(Chain):
"""Consists of an agent using tools."""
agent: Union[BaseSingleActionAgent, BaseMultiActionAgent]
"""The agent to run for creating a plan and determining actions
to take at each step of the execution loop."""
tools: Sequence[BaseTool]
"""The valid tools the agent can call."""
return_intermediate_steps: bool = False
"""Whether to return the agent's trajectory of intermediate steps
at the end in addition to the final output."""
max_iterations: Optional[int] = 15
"""The maximum number of steps to take before ending the execution
loop.
Setting to 'None' could lead to an infinite loop."""
max_execution_time: Optional[float] = None
"""The maximum amount of wall clock time to spend in the execution
loop.
"""
early_stopping_method: str = "force"
"""The method to use for early stopping if the agent never
returns `AgentFinish`. Either 'force' or 'generate'.
`"force"` returns a string saying that it stopped because it met a
time or iteration limit.
`"generate"` calls the agent's LLM Chain one final time to generate | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-13 | `"generate"` calls the agent's LLM Chain one final time to generate
a final answer based on the previous steps.
"""
handle_parsing_errors: Union[
bool, str, Callable[[OutputParserException], str]
] = False
"""How to handle errors raised by the agent's output parser.
Defaults to `False`, which raises the error.
s
If `true`, the error will be sent back to the LLM as an observation.
If a string, the string itself will be sent to the LLM as an observation.
If a callable function, the function will be called with the exception
as an argument, and the result of that function will be passed to the agent
as an observation.
"""
[docs] @classmethod
def from_agent_and_tools(
cls,
agent: Union[BaseSingleActionAgent, BaseMultiActionAgent],
tools: Sequence[BaseTool],
callback_manager: Optional[BaseCallbackManager] = None,
**kwargs: Any,
) -> AgentExecutor:
"""Create from agent and tools."""
return cls(
agent=agent, tools=tools, callback_manager=callback_manager, **kwargs
)
@root_validator()
def validate_tools(cls, values: Dict) -> Dict:
"""Validate that tools are compatible with agent."""
agent = values["agent"]
tools = values["tools"]
allowed_tools = agent.get_allowed_tools()
if allowed_tools is not None:
if set(allowed_tools) != set([tool.name for tool in tools]):
raise ValueError(
f"Allowed tools ({allowed_tools}) different than "
f"provided tools ({[tool.name for tool in tools]})" | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-14 | f"provided tools ({[tool.name for tool in tools]})"
)
return values
@root_validator()
def validate_return_direct_tool(cls, values: Dict) -> Dict:
"""Validate that tools are compatible with agent."""
agent = values["agent"]
tools = values["tools"]
if isinstance(agent, BaseMultiActionAgent):
for tool in tools:
if tool.return_direct:
raise ValueError(
"Tools that have `return_direct=True` are not allowed "
"in multi-action agents"
)
return values
[docs] def save(self, file_path: Union[Path, str]) -> None:
"""Raise error - saving not supported for Agent Executors."""
raise ValueError(
"Saving not supported for agent executors. "
"If you are trying to save the agent, please use the "
"`.save_agent(...)`"
)
[docs] def save_agent(self, file_path: Union[Path, str]) -> None:
"""Save the underlying agent."""
return self.agent.save(file_path)
@property
def input_keys(self) -> List[str]:
"""Return the input keys.
:meta private:
"""
return self.agent.input_keys
@property
def output_keys(self) -> List[str]:
"""Return the singular output key.
:meta private:
"""
if self.return_intermediate_steps:
return self.agent.return_values + ["intermediate_steps"]
else:
return self.agent.return_values
[docs] def lookup_tool(self, name: str) -> BaseTool:
"""Lookup tool by name."""
return {tool.name: tool for tool in self.tools}[name] | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-15 | return {tool.name: tool for tool in self.tools}[name]
def _should_continue(self, iterations: int, time_elapsed: float) -> bool:
if self.max_iterations is not None and iterations >= self.max_iterations:
return False
if (
self.max_execution_time is not None
and time_elapsed >= self.max_execution_time
):
return False
return True
def _return(
self,
output: AgentFinish,
intermediate_steps: list,
run_manager: Optional[CallbackManagerForChainRun] = None,
) -> Dict[str, Any]:
if run_manager:
run_manager.on_agent_finish(output, color="green", verbose=self.verbose)
final_output = output.return_values
if self.return_intermediate_steps:
final_output["intermediate_steps"] = intermediate_steps
return final_output
async def _areturn(
self,
output: AgentFinish,
intermediate_steps: list,
run_manager: Optional[AsyncCallbackManagerForChainRun] = None,
) -> Dict[str, Any]:
if run_manager:
await run_manager.on_agent_finish(
output, color="green", verbose=self.verbose
)
final_output = output.return_values
if self.return_intermediate_steps:
final_output["intermediate_steps"] = intermediate_steps
return final_output
def _take_next_step(
self,
name_to_tool_map: Dict[str, BaseTool],
color_mapping: Dict[str, str],
inputs: Dict[str, str],
intermediate_steps: List[Tuple[AgentAction, str]],
run_manager: Optional[CallbackManagerForChainRun] = None, | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-16 | run_manager: Optional[CallbackManagerForChainRun] = None,
) -> Union[AgentFinish, List[Tuple[AgentAction, str]]]:
"""Take a single step in the thought-action-observation loop.
Override this to take control of how the agent makes and acts on choices.
"""
try:
# Call the LLM to see what to do.
output = self.agent.plan(
intermediate_steps,
callbacks=run_manager.get_child() if run_manager else None,
**inputs,
)
except OutputParserException as e:
if isinstance(self.handle_parsing_errors, bool):
raise_error = not self.handle_parsing_errors
else:
raise_error = False
if raise_error:
raise e
text = str(e)
if isinstance(self.handle_parsing_errors, bool):
if e.send_to_llm:
observation = str(e.observation)
text = str(e.llm_output)
else:
observation = "Invalid or incomplete response"
elif isinstance(self.handle_parsing_errors, str):
observation = self.handle_parsing_errors
elif callable(self.handle_parsing_errors):
observation = self.handle_parsing_errors(e)
else:
raise ValueError("Got unexpected type of `handle_parsing_errors`")
output = AgentAction("_Exception", observation, text)
if run_manager:
run_manager.on_agent_action(output, color="green")
tool_run_kwargs = self.agent.tool_run_logging_kwargs()
observation = ExceptionTool().run(
output.tool_input,
verbose=self.verbose,
color=None,
callbacks=run_manager.get_child() if run_manager else None,
**tool_run_kwargs,
) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-17 | **tool_run_kwargs,
)
return [(output, observation)]
# If the tool chosen is the finishing tool, then we end and return.
if isinstance(output, AgentFinish):
return output
actions: List[AgentAction]
if isinstance(output, AgentAction):
actions = [output]
else:
actions = output
result = []
for agent_action in actions:
if run_manager:
run_manager.on_agent_action(agent_action, color="green")
# Otherwise we lookup the tool
if agent_action.tool in name_to_tool_map:
tool = name_to_tool_map[agent_action.tool]
return_direct = tool.return_direct
color = color_mapping[agent_action.tool]
tool_run_kwargs = self.agent.tool_run_logging_kwargs()
if return_direct:
tool_run_kwargs["llm_prefix"] = ""
# We then call the tool on the tool input to get an observation
observation = tool.run(
agent_action.tool_input,
verbose=self.verbose,
color=color,
callbacks=run_manager.get_child() if run_manager else None,
**tool_run_kwargs,
)
else:
tool_run_kwargs = self.agent.tool_run_logging_kwargs()
observation = InvalidTool().run(
agent_action.tool,
verbose=self.verbose,
color=None,
callbacks=run_manager.get_child() if run_manager else None,
**tool_run_kwargs,
)
result.append((agent_action, observation))
return result
async def _atake_next_step(
self,
name_to_tool_map: Dict[str, BaseTool],
color_mapping: Dict[str, str],
inputs: Dict[str, str], | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-18 | color_mapping: Dict[str, str],
inputs: Dict[str, str],
intermediate_steps: List[Tuple[AgentAction, str]],
run_manager: Optional[AsyncCallbackManagerForChainRun] = None,
) -> Union[AgentFinish, List[Tuple[AgentAction, str]]]:
"""Take a single step in the thought-action-observation loop.
Override this to take control of how the agent makes and acts on choices.
"""
try:
# Call the LLM to see what to do.
output = await self.agent.aplan(
intermediate_steps,
callbacks=run_manager.get_child() if run_manager else None,
**inputs,
)
except OutputParserException as e:
if isinstance(self.handle_parsing_errors, bool):
raise_error = not self.handle_parsing_errors
else:
raise_error = False
if raise_error:
raise e
text = str(e)
if isinstance(self.handle_parsing_errors, bool):
if e.send_to_llm:
observation = str(e.observation)
text = str(e.llm_output)
else:
observation = "Invalid or incomplete response"
elif isinstance(self.handle_parsing_errors, str):
observation = self.handle_parsing_errors
elif callable(self.handle_parsing_errors):
observation = self.handle_parsing_errors(e)
else:
raise ValueError("Got unexpected type of `handle_parsing_errors`")
output = AgentAction("_Exception", observation, text)
tool_run_kwargs = self.agent.tool_run_logging_kwargs()
observation = await ExceptionTool().arun(
output.tool_input,
verbose=self.verbose,
color=None, | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-19 | output.tool_input,
verbose=self.verbose,
color=None,
callbacks=run_manager.get_child() if run_manager else None,
**tool_run_kwargs,
)
return [(output, observation)]
# If the tool chosen is the finishing tool, then we end and return.
if isinstance(output, AgentFinish):
return output
actions: List[AgentAction]
if isinstance(output, AgentAction):
actions = [output]
else:
actions = output
async def _aperform_agent_action(
agent_action: AgentAction,
) -> Tuple[AgentAction, str]:
if run_manager:
await run_manager.on_agent_action(
agent_action, verbose=self.verbose, color="green"
)
# Otherwise we lookup the tool
if agent_action.tool in name_to_tool_map:
tool = name_to_tool_map[agent_action.tool]
return_direct = tool.return_direct
color = color_mapping[agent_action.tool]
tool_run_kwargs = self.agent.tool_run_logging_kwargs()
if return_direct:
tool_run_kwargs["llm_prefix"] = ""
# We then call the tool on the tool input to get an observation
observation = await tool.arun(
agent_action.tool_input,
verbose=self.verbose,
color=color,
callbacks=run_manager.get_child() if run_manager else None,
**tool_run_kwargs,
)
else:
tool_run_kwargs = self.agent.tool_run_logging_kwargs()
observation = await InvalidTool().arun(
agent_action.tool,
verbose=self.verbose,
color=None,
callbacks=run_manager.get_child() if run_manager else None,
**tool_run_kwargs,
) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-20 | **tool_run_kwargs,
)
return agent_action, observation
# Use asyncio.gather to run multiple tool.arun() calls concurrently
result = await asyncio.gather(
*[_aperform_agent_action(agent_action) for agent_action in actions]
)
return list(result)
def _call(
self,
inputs: Dict[str, str],
run_manager: Optional[CallbackManagerForChainRun] = None,
) -> Dict[str, Any]:
"""Run text through and get agent response."""
# Construct a mapping of tool name to tool for easy lookup
name_to_tool_map = {tool.name: tool for tool in self.tools}
# We construct a mapping from each tool to a color, used for logging.
color_mapping = get_color_mapping(
[tool.name for tool in self.tools], excluded_colors=["green", "red"]
)
intermediate_steps: List[Tuple[AgentAction, str]] = []
# Let's start tracking the number of iterations and time elapsed
iterations = 0
time_elapsed = 0.0
start_time = time.time()
# We now enter the agent loop (until it returns something).
while self._should_continue(iterations, time_elapsed):
next_step_output = self._take_next_step(
name_to_tool_map,
color_mapping,
inputs,
intermediate_steps,
run_manager=run_manager,
)
if isinstance(next_step_output, AgentFinish):
return self._return(
next_step_output, intermediate_steps, run_manager=run_manager
)
intermediate_steps.extend(next_step_output)
if len(next_step_output) == 1:
next_step_action = next_step_output[0] | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-21 | next_step_action = next_step_output[0]
# See if tool should return directly
tool_return = self._get_tool_return(next_step_action)
if tool_return is not None:
return self._return(
tool_return, intermediate_steps, run_manager=run_manager
)
iterations += 1
time_elapsed = time.time() - start_time
output = self.agent.return_stopped_response(
self.early_stopping_method, intermediate_steps, **inputs
)
return self._return(output, intermediate_steps, run_manager=run_manager)
async def _acall(
self,
inputs: Dict[str, str],
run_manager: Optional[AsyncCallbackManagerForChainRun] = None,
) -> Dict[str, str]:
"""Run text through and get agent response."""
# Construct a mapping of tool name to tool for easy lookup
name_to_tool_map = {tool.name: tool for tool in self.tools}
# We construct a mapping from each tool to a color, used for logging.
color_mapping = get_color_mapping(
[tool.name for tool in self.tools], excluded_colors=["green"]
)
intermediate_steps: List[Tuple[AgentAction, str]] = []
# Let's start tracking the number of iterations and time elapsed
iterations = 0
time_elapsed = 0.0
start_time = time.time()
# We now enter the agent loop (until it returns something).
async with asyncio_timeout(self.max_execution_time):
try:
while self._should_continue(iterations, time_elapsed):
next_step_output = await self._atake_next_step(
name_to_tool_map,
color_mapping,
inputs,
intermediate_steps, | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-22 | color_mapping,
inputs,
intermediate_steps,
run_manager=run_manager,
)
if isinstance(next_step_output, AgentFinish):
return await self._areturn(
next_step_output,
intermediate_steps,
run_manager=run_manager,
)
intermediate_steps.extend(next_step_output)
if len(next_step_output) == 1:
next_step_action = next_step_output[0]
# See if tool should return directly
tool_return = self._get_tool_return(next_step_action)
if tool_return is not None:
return await self._areturn(
tool_return, intermediate_steps, run_manager=run_manager
)
iterations += 1
time_elapsed = time.time() - start_time
output = self.agent.return_stopped_response(
self.early_stopping_method, intermediate_steps, **inputs
)
return await self._areturn(
output, intermediate_steps, run_manager=run_manager
)
except TimeoutError:
# stop early when interrupted by the async timeout
output = self.agent.return_stopped_response(
self.early_stopping_method, intermediate_steps, **inputs
)
return await self._areturn(
output, intermediate_steps, run_manager=run_manager
)
def _get_tool_return(
self, next_step_output: Tuple[AgentAction, str]
) -> Optional[AgentFinish]:
"""Check if the tool is a returning tool."""
agent_action, observation = next_step_output
name_to_tool_map = {tool.name: tool for tool in self.tools}
# Invalid tools won't be in the map, so we return False.
if agent_action.tool in name_to_tool_map: | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
45339159c89f-23 | if agent_action.tool in name_to_tool_map:
if name_to_tool_map[agent_action.tool].return_direct:
return AgentFinish(
{self.agent.return_values[0]: observation},
"",
)
return None | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent.html |
96bcfe0241f4-0 | Source code for langchain.agents.load_tools
# flake8: noqa
"""Load tools."""
import warnings
from typing import Any, Dict, List, Optional, Callable, Tuple
from mypy_extensions import Arg, KwArg
from langchain.agents.tools import Tool
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.base import BaseCallbackManager
from langchain.callbacks.manager import Callbacks
from langchain.chains.api import news_docs, open_meteo_docs, podcast_docs, tmdb_docs
from langchain.chains.api.base import APIChain
from langchain.chains.llm_math.base import LLMMathChain
from langchain.chains.pal.base import PALChain
from langchain.requests import TextRequestsWrapper
from langchain.tools.arxiv.tool import ArxivQueryRun
from langchain.tools.pubmed.tool import PubmedQueryRun
from langchain.tools.base import BaseTool
from langchain.tools.bing_search.tool import BingSearchRun
from langchain.tools.ddg_search.tool import DuckDuckGoSearchRun
from langchain.tools.google_search.tool import GoogleSearchResults, GoogleSearchRun
from langchain.tools.metaphor_search.tool import MetaphorSearchResults
from langchain.tools.google_serper.tool import GoogleSerperResults, GoogleSerperRun
from langchain.tools.graphql.tool import BaseGraphQLTool
from langchain.tools.human.tool import HumanInputRun
from langchain.tools.python.tool import PythonREPLTool
from langchain.tools.requests.tool import (
RequestsDeleteTool,
RequestsGetTool,
RequestsPatchTool,
RequestsPostTool,
RequestsPutTool,
)
from langchain.tools.scenexplain.tool import SceneXplainTool
from langchain.tools.searx_search.tool import SearxSearchResults, SearxSearchRun
from langchain.tools.shell.tool import ShellTool | https://api.python.langchain.com/en/latest/_modules/langchain/agents/load_tools.html |
96bcfe0241f4-1 | from langchain.tools.shell.tool import ShellTool
from langchain.tools.sleep.tool import SleepTool
from langchain.tools.wikipedia.tool import WikipediaQueryRun
from langchain.tools.wolfram_alpha.tool import WolframAlphaQueryRun
from langchain.tools.openweathermap.tool import OpenWeatherMapQueryRun
from langchain.utilities import ArxivAPIWrapper
from langchain.utilities import PubMedAPIWrapper
from langchain.utilities.bing_search import BingSearchAPIWrapper
from langchain.utilities.duckduckgo_search import DuckDuckGoSearchAPIWrapper
from langchain.utilities.google_search import GoogleSearchAPIWrapper
from langchain.utilities.google_serper import GoogleSerperAPIWrapper
from langchain.utilities.metaphor_search import MetaphorSearchAPIWrapper
from langchain.utilities.awslambda import LambdaWrapper
from langchain.utilities.graphql import GraphQLAPIWrapper
from langchain.utilities.searx_search import SearxSearchWrapper
from langchain.utilities.serpapi import SerpAPIWrapper
from langchain.utilities.twilio import TwilioAPIWrapper
from langchain.utilities.wikipedia import WikipediaAPIWrapper
from langchain.utilities.wolfram_alpha import WolframAlphaAPIWrapper
from langchain.utilities.openweathermap import OpenWeatherMapAPIWrapper
def _get_python_repl() -> BaseTool:
return PythonREPLTool()
def _get_tools_requests_get() -> BaseTool:
return RequestsGetTool(requests_wrapper=TextRequestsWrapper())
def _get_tools_requests_post() -> BaseTool:
return RequestsPostTool(requests_wrapper=TextRequestsWrapper())
def _get_tools_requests_patch() -> BaseTool:
return RequestsPatchTool(requests_wrapper=TextRequestsWrapper())
def _get_tools_requests_put() -> BaseTool:
return RequestsPutTool(requests_wrapper=TextRequestsWrapper())
def _get_tools_requests_delete() -> BaseTool: | https://api.python.langchain.com/en/latest/_modules/langchain/agents/load_tools.html |
96bcfe0241f4-2 | def _get_tools_requests_delete() -> BaseTool:
return RequestsDeleteTool(requests_wrapper=TextRequestsWrapper())
def _get_terminal() -> BaseTool:
return ShellTool()
def _get_sleep() -> BaseTool:
return SleepTool()
_BASE_TOOLS: Dict[str, Callable[[], BaseTool]] = {
"python_repl": _get_python_repl,
"requests": _get_tools_requests_get, # preserved for backwards compatability
"requests_get": _get_tools_requests_get,
"requests_post": _get_tools_requests_post,
"requests_patch": _get_tools_requests_patch,
"requests_put": _get_tools_requests_put,
"requests_delete": _get_tools_requests_delete,
"terminal": _get_terminal,
"sleep": _get_sleep,
}
def _get_pal_math(llm: BaseLanguageModel) -> BaseTool:
return Tool(
name="PAL-MATH",
description="A language model that is really good at solving complex word math problems. Input should be a fully worded hard word math problem.",
func=PALChain.from_math_prompt(llm).run,
)
def _get_pal_colored_objects(llm: BaseLanguageModel) -> BaseTool:
return Tool(
name="PAL-COLOR-OBJ",
description="A language model that is really good at reasoning about position and the color attributes of objects. Input should be a fully worded hard reasoning problem. Make sure to include all information about the objects AND the final question you want to answer.",
func=PALChain.from_colored_object_prompt(llm).run,
)
def _get_llm_math(llm: BaseLanguageModel) -> BaseTool:
return Tool(
name="Calculator", | https://api.python.langchain.com/en/latest/_modules/langchain/agents/load_tools.html |
96bcfe0241f4-3 | return Tool(
name="Calculator",
description="Useful for when you need to answer questions about math.",
func=LLMMathChain.from_llm(llm=llm).run,
coroutine=LLMMathChain.from_llm(llm=llm).arun,
)
def _get_open_meteo_api(llm: BaseLanguageModel) -> BaseTool:
chain = APIChain.from_llm_and_api_docs(llm, open_meteo_docs.OPEN_METEO_DOCS)
return Tool(
name="Open Meteo API",
description="Useful for when you want to get weather information from the OpenMeteo API. The input should be a question in natural language that this API can answer.",
func=chain.run,
)
_LLM_TOOLS: Dict[str, Callable[[BaseLanguageModel], BaseTool]] = {
"pal-math": _get_pal_math,
"pal-colored-objects": _get_pal_colored_objects,
"llm-math": _get_llm_math,
"open-meteo-api": _get_open_meteo_api,
}
def _get_news_api(llm: BaseLanguageModel, **kwargs: Any) -> BaseTool:
news_api_key = kwargs["news_api_key"]
chain = APIChain.from_llm_and_api_docs(
llm, news_docs.NEWS_DOCS, headers={"X-Api-Key": news_api_key}
)
return Tool(
name="News API",
description="Use this when you want to get information about the top headlines of current news stories. The input should be a question in natural language that this API can answer.",
func=chain.run,
) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/load_tools.html |
96bcfe0241f4-4 | func=chain.run,
)
def _get_tmdb_api(llm: BaseLanguageModel, **kwargs: Any) -> BaseTool:
tmdb_bearer_token = kwargs["tmdb_bearer_token"]
chain = APIChain.from_llm_and_api_docs(
llm,
tmdb_docs.TMDB_DOCS,
headers={"Authorization": f"Bearer {tmdb_bearer_token}"},
)
return Tool(
name="TMDB API",
description="Useful for when you want to get information from The Movie Database. The input should be a question in natural language that this API can answer.",
func=chain.run,
)
def _get_podcast_api(llm: BaseLanguageModel, **kwargs: Any) -> BaseTool:
listen_api_key = kwargs["listen_api_key"]
chain = APIChain.from_llm_and_api_docs(
llm,
podcast_docs.PODCAST_DOCS,
headers={"X-ListenAPI-Key": listen_api_key},
)
return Tool(
name="Podcast API",
description="Use the Listen Notes Podcast API to search all podcasts or episodes. The input should be a question in natural language that this API can answer.",
func=chain.run,
)
def _get_lambda_api(**kwargs: Any) -> BaseTool:
return Tool(
name=kwargs["awslambda_tool_name"],
description=kwargs["awslambda_tool_description"],
func=LambdaWrapper(**kwargs).run,
)
def _get_wolfram_alpha(**kwargs: Any) -> BaseTool:
return WolframAlphaQueryRun(api_wrapper=WolframAlphaAPIWrapper(**kwargs))
def _get_google_search(**kwargs: Any) -> BaseTool: | https://api.python.langchain.com/en/latest/_modules/langchain/agents/load_tools.html |
96bcfe0241f4-5 | def _get_google_search(**kwargs: Any) -> BaseTool:
return GoogleSearchRun(api_wrapper=GoogleSearchAPIWrapper(**kwargs))
def _get_wikipedia(**kwargs: Any) -> BaseTool:
return WikipediaQueryRun(api_wrapper=WikipediaAPIWrapper(**kwargs))
def _get_arxiv(**kwargs: Any) -> BaseTool:
return ArxivQueryRun(api_wrapper=ArxivAPIWrapper(**kwargs))
def _get_pupmed(**kwargs: Any) -> BaseTool:
return PubmedQueryRun(api_wrapper=PubMedAPIWrapper(**kwargs))
def _get_google_serper(**kwargs: Any) -> BaseTool:
return GoogleSerperRun(api_wrapper=GoogleSerperAPIWrapper(**kwargs))
def _get_google_serper_results_json(**kwargs: Any) -> BaseTool:
return GoogleSerperResults(api_wrapper=GoogleSerperAPIWrapper(**kwargs))
def _get_google_search_results_json(**kwargs: Any) -> BaseTool:
return GoogleSearchResults(api_wrapper=GoogleSearchAPIWrapper(**kwargs))
def _get_serpapi(**kwargs: Any) -> BaseTool:
return Tool(
name="Search",
description="A search engine. Useful for when you need to answer questions about current events. Input should be a search query.",
func=SerpAPIWrapper(**kwargs).run,
coroutine=SerpAPIWrapper(**kwargs).arun,
)
def _get_twilio(**kwargs: Any) -> BaseTool:
return Tool(
name="Text Message",
description="Useful for when you need to send a text message to a provided phone number.",
func=TwilioAPIWrapper(**kwargs).run,
)
def _get_searx_search(**kwargs: Any) -> BaseTool: | https://api.python.langchain.com/en/latest/_modules/langchain/agents/load_tools.html |
96bcfe0241f4-6 | )
def _get_searx_search(**kwargs: Any) -> BaseTool:
return SearxSearchRun(wrapper=SearxSearchWrapper(**kwargs))
def _get_searx_search_results_json(**kwargs: Any) -> BaseTool:
wrapper_kwargs = {k: v for k, v in kwargs.items() if k != "num_results"}
return SearxSearchResults(wrapper=SearxSearchWrapper(**wrapper_kwargs), **kwargs)
def _get_bing_search(**kwargs: Any) -> BaseTool:
return BingSearchRun(api_wrapper=BingSearchAPIWrapper(**kwargs))
def _get_metaphor_search(**kwargs: Any) -> BaseTool:
return MetaphorSearchResults(api_wrapper=MetaphorSearchAPIWrapper(**kwargs))
def _get_ddg_search(**kwargs: Any) -> BaseTool:
return DuckDuckGoSearchRun(api_wrapper=DuckDuckGoSearchAPIWrapper(**kwargs))
def _get_human_tool(**kwargs: Any) -> BaseTool:
return HumanInputRun(**kwargs)
def _get_scenexplain(**kwargs: Any) -> BaseTool:
return SceneXplainTool(**kwargs)
def _get_graphql_tool(**kwargs: Any) -> BaseTool:
graphql_endpoint = kwargs["graphql_endpoint"]
wrapper = GraphQLAPIWrapper(graphql_endpoint=graphql_endpoint)
return BaseGraphQLTool(graphql_wrapper=wrapper)
def _get_openweathermap(**kwargs: Any) -> BaseTool:
return OpenWeatherMapQueryRun(api_wrapper=OpenWeatherMapAPIWrapper(**kwargs))
_EXTRA_LLM_TOOLS: Dict[
str,
Tuple[Callable[[Arg(BaseLanguageModel, "llm"), KwArg(Any)], BaseTool], List[str]],
] = { | https://api.python.langchain.com/en/latest/_modules/langchain/agents/load_tools.html |
96bcfe0241f4-7 | ] = {
"news-api": (_get_news_api, ["news_api_key"]),
"tmdb-api": (_get_tmdb_api, ["tmdb_bearer_token"]),
"podcast-api": (_get_podcast_api, ["listen_api_key"]),
}
_EXTRA_OPTIONAL_TOOLS: Dict[str, Tuple[Callable[[KwArg(Any)], BaseTool], List[str]]] = {
"wolfram-alpha": (_get_wolfram_alpha, ["wolfram_alpha_appid"]),
"google-search": (_get_google_search, ["google_api_key", "google_cse_id"]),
"google-search-results-json": (
_get_google_search_results_json,
["google_api_key", "google_cse_id", "num_results"],
),
"searx-search-results-json": (
_get_searx_search_results_json,
["searx_host", "engines", "num_results", "aiosession"],
),
"bing-search": (_get_bing_search, ["bing_subscription_key", "bing_search_url"]),
"metaphor-search": (_get_metaphor_search, ["metaphor_api_key"]),
"ddg-search": (_get_ddg_search, []),
"google-serper": (_get_google_serper, ["serper_api_key", "aiosession"]),
"google-serper-results-json": (
_get_google_serper_results_json,
["serper_api_key", "aiosession"],
),
"serpapi": (_get_serpapi, ["serpapi_api_key", "aiosession"]),
"twilio": (_get_twilio, ["account_sid", "auth_token", "from_number"]), | https://api.python.langchain.com/en/latest/_modules/langchain/agents/load_tools.html |
96bcfe0241f4-8 | "searx-search": (_get_searx_search, ["searx_host", "engines", "aiosession"]),
"wikipedia": (_get_wikipedia, ["top_k_results", "lang"]),
"arxiv": (
_get_arxiv,
["top_k_results", "load_max_docs", "load_all_available_meta"],
),
"pupmed": (
_get_pupmed,
["top_k_results", "load_max_docs", "load_all_available_meta"],
),
"human": (_get_human_tool, ["prompt_func", "input_func"]),
"awslambda": (
_get_lambda_api,
["awslambda_tool_name", "awslambda_tool_description", "function_name"],
),
"sceneXplain": (_get_scenexplain, []),
"graphql": (_get_graphql_tool, ["graphql_endpoint"]),
"openweathermap-api": (_get_openweathermap, ["openweathermap_api_key"]),
}
def _handle_callbacks(
callback_manager: Optional[BaseCallbackManager], callbacks: Callbacks
) -> Callbacks:
if callback_manager is not None:
warnings.warn(
"callback_manager is deprecated. Please use callbacks instead.",
DeprecationWarning,
)
if callbacks is not None:
raise ValueError(
"Cannot specify both callback_manager and callbacks arguments."
)
return callback_manager
return callbacks
[docs]def load_huggingface_tool(
task_or_repo_id: str,
model_repo_id: Optional[str] = None,
token: Optional[str] = None,
remote: bool = False,
**kwargs: Any,
) -> BaseTool: | https://api.python.langchain.com/en/latest/_modules/langchain/agents/load_tools.html |
96bcfe0241f4-9 | **kwargs: Any,
) -> BaseTool:
"""Loads a tool from the HuggingFace Hub.
Args:
task_or_repo_id: Task or model repo id.
model_repo_id: Optional model repo id.
token: Optional token.
remote: Optional remote. Defaults to False.
**kwargs:
Returns:
A tool.
"""
try:
from transformers import load_tool
except ImportError:
raise ImportError(
"HuggingFace tools require the libraries `transformers>=4.29.0`"
" and `huggingface_hub>=0.14.1` to be installed."
" Please install it with"
" `pip install --upgrade transformers huggingface_hub`."
)
hf_tool = load_tool(
task_or_repo_id,
model_repo_id=model_repo_id,
token=token,
remote=remote,
**kwargs,
)
outputs = hf_tool.outputs
if set(outputs) != {"text"}:
raise NotImplementedError("Multimodal outputs not supported yet.")
inputs = hf_tool.inputs
if set(inputs) != {"text"}:
raise NotImplementedError("Multimodal inputs not supported yet.")
return Tool.from_function(
hf_tool.__call__, name=hf_tool.name, description=hf_tool.description
)
[docs]def load_tools(
tool_names: List[str],
llm: Optional[BaseLanguageModel] = None,
callbacks: Callbacks = None,
**kwargs: Any,
) -> List[BaseTool]:
"""Load tools based on their name.
Args:
tool_names: name of tools to load. | https://api.python.langchain.com/en/latest/_modules/langchain/agents/load_tools.html |
96bcfe0241f4-10 | Args:
tool_names: name of tools to load.
llm: Optional language model, may be needed to initialize certain tools.
callbacks: Optional callback manager or list of callback handlers.
If not provided, default global callback manager will be used.
Returns:
List of tools.
"""
tools = []
callbacks = _handle_callbacks(
callback_manager=kwargs.get("callback_manager"), callbacks=callbacks
)
for name in tool_names:
if name == "requests":
warnings.warn(
"tool name `requests` is deprecated - "
"please use `requests_all` or specify the requests method"
)
if name == "requests_all":
# expand requests into various methods
requests_method_tools = [
_tool for _tool in _BASE_TOOLS if _tool.startswith("requests_")
]
tool_names.extend(requests_method_tools)
elif name in _BASE_TOOLS:
tools.append(_BASE_TOOLS[name]())
elif name in _LLM_TOOLS:
if llm is None:
raise ValueError(f"Tool {name} requires an LLM to be provided")
tool = _LLM_TOOLS[name](llm)
tools.append(tool)
elif name in _EXTRA_LLM_TOOLS:
if llm is None:
raise ValueError(f"Tool {name} requires an LLM to be provided")
_get_llm_tool_func, extra_keys = _EXTRA_LLM_TOOLS[name]
missing_keys = set(extra_keys).difference(kwargs)
if missing_keys:
raise ValueError(
f"Tool {name} requires some parameters that were not "
f"provided: {missing_keys}"
) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/load_tools.html |
96bcfe0241f4-11 | f"provided: {missing_keys}"
)
sub_kwargs = {k: kwargs[k] for k in extra_keys}
tool = _get_llm_tool_func(llm=llm, **sub_kwargs)
tools.append(tool)
elif name in _EXTRA_OPTIONAL_TOOLS:
_get_tool_func, extra_keys = _EXTRA_OPTIONAL_TOOLS[name]
sub_kwargs = {k: kwargs[k] for k in extra_keys if k in kwargs}
tool = _get_tool_func(**sub_kwargs)
tools.append(tool)
else:
raise ValueError(f"Got unknown tool {name}")
if callbacks is not None:
for tool in tools:
tool.callbacks = callbacks
return tools
[docs]def get_all_tool_names() -> List[str]:
"""Get a list of all possible tool names."""
return (
list(_BASE_TOOLS)
+ list(_EXTRA_OPTIONAL_TOOLS)
+ list(_EXTRA_LLM_TOOLS)
+ list(_LLM_TOOLS)
) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/load_tools.html |
28c34f5ff74a-0 | Source code for langchain.agents.conversational.base
"""An agent designed to hold a conversation in addition to using tools."""
from __future__ import annotations
from typing import Any, List, Optional, Sequence
from pydantic import Field
from langchain.agents.agent import Agent, AgentOutputParser
from langchain.agents.agent_types import AgentType
from langchain.agents.conversational.output_parser import ConvoOutputParser
from langchain.agents.conversational.prompt import FORMAT_INSTRUCTIONS, PREFIX, SUFFIX
from langchain.agents.utils import validate_tools_single_input
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.base import BaseCallbackManager
from langchain.chains import LLMChain
from langchain.prompts import PromptTemplate
from langchain.tools.base import BaseTool
[docs]class ConversationalAgent(Agent):
"""An agent designed to hold a conversation in addition to using tools."""
ai_prefix: str = "AI"
output_parser: AgentOutputParser = Field(default_factory=ConvoOutputParser)
@classmethod
def _get_default_output_parser(
cls, ai_prefix: str = "AI", **kwargs: Any
) -> AgentOutputParser:
return ConvoOutputParser(ai_prefix=ai_prefix)
@property
def _agent_type(self) -> str:
"""Return Identifier of agent type."""
return AgentType.CONVERSATIONAL_REACT_DESCRIPTION
@property
def observation_prefix(self) -> str:
"""Prefix to append the observation with."""
return "Observation: "
@property
def llm_prefix(self) -> str:
"""Prefix to append the llm call with."""
return "Thought:"
[docs] @classmethod
def create_prompt(
cls, | https://api.python.langchain.com/en/latest/_modules/langchain/agents/conversational/base.html |
28c34f5ff74a-1 | [docs] @classmethod
def create_prompt(
cls,
tools: Sequence[BaseTool],
prefix: str = PREFIX,
suffix: str = SUFFIX,
format_instructions: str = FORMAT_INSTRUCTIONS,
ai_prefix: str = "AI",
human_prefix: str = "Human",
input_variables: Optional[List[str]] = None,
) -> PromptTemplate:
"""Create prompt in the style of the zero shot agent.
Args:
tools: List of tools the agent will have access to, used to format the
prompt.
prefix: String to put before the list of tools.
suffix: String to put after the list of tools.
ai_prefix: String to use before AI output.
human_prefix: String to use before human output.
input_variables: List of input variables the final prompt will expect.
Returns:
A PromptTemplate with the template assembled from the pieces here.
"""
tool_strings = "\n".join(
[f"> {tool.name}: {tool.description}" for tool in tools]
)
tool_names = ", ".join([tool.name for tool in tools])
format_instructions = format_instructions.format(
tool_names=tool_names, ai_prefix=ai_prefix, human_prefix=human_prefix
)
template = "\n\n".join([prefix, tool_strings, format_instructions, suffix])
if input_variables is None:
input_variables = ["input", "chat_history", "agent_scratchpad"]
return PromptTemplate(template=template, input_variables=input_variables)
@classmethod
def _validate_tools(cls, tools: Sequence[BaseTool]) -> None:
super()._validate_tools(tools)
validate_tools_single_input(cls.__name__, tools) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/conversational/base.html |
28c34f5ff74a-2 | validate_tools_single_input(cls.__name__, tools)
[docs] @classmethod
def from_llm_and_tools(
cls,
llm: BaseLanguageModel,
tools: Sequence[BaseTool],
callback_manager: Optional[BaseCallbackManager] = None,
output_parser: Optional[AgentOutputParser] = None,
prefix: str = PREFIX,
suffix: str = SUFFIX,
format_instructions: str = FORMAT_INSTRUCTIONS,
ai_prefix: str = "AI",
human_prefix: str = "Human",
input_variables: Optional[List[str]] = None,
**kwargs: Any,
) -> Agent:
"""Construct an agent from an LLM and tools."""
cls._validate_tools(tools)
prompt = cls.create_prompt(
tools,
ai_prefix=ai_prefix,
human_prefix=human_prefix,
prefix=prefix,
suffix=suffix,
format_instructions=format_instructions,
input_variables=input_variables,
)
llm_chain = LLMChain(
llm=llm,
prompt=prompt,
callback_manager=callback_manager,
)
tool_names = [tool.name for tool in tools]
_output_parser = output_parser or cls._get_default_output_parser(
ai_prefix=ai_prefix
)
return cls(
llm_chain=llm_chain,
allowed_tools=tool_names,
ai_prefix=ai_prefix,
output_parser=_output_parser,
**kwargs,
) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/conversational/base.html |
e34d7b3012a3-0 | Source code for langchain.agents.conversational_chat.base
"""An agent designed to hold a conversation in addition to using tools."""
from __future__ import annotations
from typing import Any, List, Optional, Sequence, Tuple
from pydantic import Field
from langchain.agents.agent import Agent, AgentOutputParser
from langchain.agents.conversational_chat.output_parser import ConvoOutputParser
from langchain.agents.conversational_chat.prompt import (
PREFIX,
SUFFIX,
TEMPLATE_TOOL_RESPONSE,
)
from langchain.agents.utils import validate_tools_single_input
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.base import BaseCallbackManager
from langchain.chains import LLMChain
from langchain.prompts.base import BasePromptTemplate
from langchain.prompts.chat import (
ChatPromptTemplate,
HumanMessagePromptTemplate,
MessagesPlaceholder,
SystemMessagePromptTemplate,
)
from langchain.schema import (
AgentAction,
AIMessage,
BaseMessage,
BaseOutputParser,
HumanMessage,
)
from langchain.tools.base import BaseTool
[docs]class ConversationalChatAgent(Agent):
"""An agent designed to hold a conversation in addition to using tools."""
output_parser: AgentOutputParser = Field(default_factory=ConvoOutputParser)
template_tool_response: str = TEMPLATE_TOOL_RESPONSE
@classmethod
def _get_default_output_parser(cls, **kwargs: Any) -> AgentOutputParser:
return ConvoOutputParser()
@property
def _agent_type(self) -> str:
raise NotImplementedError
@property
def observation_prefix(self) -> str:
"""Prefix to append the observation with."""
return "Observation: "
@property | https://api.python.langchain.com/en/latest/_modules/langchain/agents/conversational_chat/base.html |
e34d7b3012a3-1 | return "Observation: "
@property
def llm_prefix(self) -> str:
"""Prefix to append the llm call with."""
return "Thought:"
@classmethod
def _validate_tools(cls, tools: Sequence[BaseTool]) -> None:
super()._validate_tools(tools)
validate_tools_single_input(cls.__name__, tools)
[docs] @classmethod
def create_prompt(
cls,
tools: Sequence[BaseTool],
system_message: str = PREFIX,
human_message: str = SUFFIX,
input_variables: Optional[List[str]] = None,
output_parser: Optional[BaseOutputParser] = None,
) -> BasePromptTemplate:
tool_strings = "\n".join(
[f"> {tool.name}: {tool.description}" for tool in tools]
)
tool_names = ", ".join([tool.name for tool in tools])
_output_parser = output_parser or cls._get_default_output_parser()
format_instructions = human_message.format(
format_instructions=_output_parser.get_format_instructions()
)
final_prompt = format_instructions.format(
tool_names=tool_names, tools=tool_strings
)
if input_variables is None:
input_variables = ["input", "chat_history", "agent_scratchpad"]
messages = [
SystemMessagePromptTemplate.from_template(system_message),
MessagesPlaceholder(variable_name="chat_history"),
HumanMessagePromptTemplate.from_template(final_prompt),
MessagesPlaceholder(variable_name="agent_scratchpad"),
]
return ChatPromptTemplate(input_variables=input_variables, messages=messages)
def _construct_scratchpad(
self, intermediate_steps: List[Tuple[AgentAction, str]]
) -> List[BaseMessage]: | https://api.python.langchain.com/en/latest/_modules/langchain/agents/conversational_chat/base.html |
e34d7b3012a3-2 | ) -> List[BaseMessage]:
"""Construct the scratchpad that lets the agent continue its thought process."""
thoughts: List[BaseMessage] = []
for action, observation in intermediate_steps:
thoughts.append(AIMessage(content=action.log))
human_message = HumanMessage(
content=self.template_tool_response.format(observation=observation)
)
thoughts.append(human_message)
return thoughts
[docs] @classmethod
def from_llm_and_tools(
cls,
llm: BaseLanguageModel,
tools: Sequence[BaseTool],
callback_manager: Optional[BaseCallbackManager] = None,
output_parser: Optional[AgentOutputParser] = None,
system_message: str = PREFIX,
human_message: str = SUFFIX,
input_variables: Optional[List[str]] = None,
**kwargs: Any,
) -> Agent:
"""Construct an agent from an LLM and tools."""
cls._validate_tools(tools)
_output_parser = output_parser or cls._get_default_output_parser()
prompt = cls.create_prompt(
tools,
system_message=system_message,
human_message=human_message,
input_variables=input_variables,
output_parser=_output_parser,
)
llm_chain = LLMChain(
llm=llm,
prompt=prompt,
callback_manager=callback_manager,
)
tool_names = [tool.name for tool in tools]
return cls(
llm_chain=llm_chain,
allowed_tools=tool_names,
output_parser=_output_parser,
**kwargs,
) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/conversational_chat/base.html |
cba691317bf1-0 | Source code for langchain.agents.structured_chat.base
import re
from typing import Any, List, Optional, Sequence, Tuple
from pydantic import Field
from langchain.agents.agent import Agent, AgentOutputParser
from langchain.agents.structured_chat.output_parser import (
StructuredChatOutputParserWithRetries,
)
from langchain.agents.structured_chat.prompt import FORMAT_INSTRUCTIONS, PREFIX, SUFFIX
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.base import BaseCallbackManager
from langchain.chains.llm import LLMChain
from langchain.prompts.base import BasePromptTemplate
from langchain.prompts.chat import (
ChatPromptTemplate,
HumanMessagePromptTemplate,
SystemMessagePromptTemplate,
)
from langchain.schema import AgentAction
from langchain.tools import BaseTool
HUMAN_MESSAGE_TEMPLATE = "{input}\n\n{agent_scratchpad}"
[docs]class StructuredChatAgent(Agent):
output_parser: AgentOutputParser = Field(
default_factory=StructuredChatOutputParserWithRetries
)
@property
def observation_prefix(self) -> str:
"""Prefix to append the observation with."""
return "Observation: "
@property
def llm_prefix(self) -> str:
"""Prefix to append the llm call with."""
return "Thought:"
def _construct_scratchpad(
self, intermediate_steps: List[Tuple[AgentAction, str]]
) -> str:
agent_scratchpad = super()._construct_scratchpad(intermediate_steps)
if not isinstance(agent_scratchpad, str):
raise ValueError("agent_scratchpad should be of type string.")
if agent_scratchpad:
return (
f"This was your previous work " | https://api.python.langchain.com/en/latest/_modules/langchain/agents/structured_chat/base.html |
cba691317bf1-1 | return (
f"This was your previous work "
f"(but I haven't seen any of it! I only see what "
f"you return as final answer):\n{agent_scratchpad}"
)
else:
return agent_scratchpad
@classmethod
def _validate_tools(cls, tools: Sequence[BaseTool]) -> None:
pass
@classmethod
def _get_default_output_parser(
cls, llm: Optional[BaseLanguageModel] = None, **kwargs: Any
) -> AgentOutputParser:
return StructuredChatOutputParserWithRetries.from_llm(llm=llm)
@property
def _stop(self) -> List[str]:
return ["Observation:"]
[docs] @classmethod
def create_prompt(
cls,
tools: Sequence[BaseTool],
prefix: str = PREFIX,
suffix: str = SUFFIX,
human_message_template: str = HUMAN_MESSAGE_TEMPLATE,
format_instructions: str = FORMAT_INSTRUCTIONS,
input_variables: Optional[List[str]] = None,
memory_prompts: Optional[List[BasePromptTemplate]] = None,
) -> BasePromptTemplate:
tool_strings = []
for tool in tools:
args_schema = re.sub("}", "}}}}", re.sub("{", "{{{{", str(tool.args)))
tool_strings.append(f"{tool.name}: {tool.description}, args: {args_schema}")
formatted_tools = "\n".join(tool_strings)
tool_names = ", ".join([tool.name for tool in tools])
format_instructions = format_instructions.format(tool_names=tool_names)
template = "\n\n".join([prefix, formatted_tools, format_instructions, suffix]) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/structured_chat/base.html |
cba691317bf1-2 | template = "\n\n".join([prefix, formatted_tools, format_instructions, suffix])
if input_variables is None:
input_variables = ["input", "agent_scratchpad"]
_memory_prompts = memory_prompts or []
messages = [
SystemMessagePromptTemplate.from_template(template),
*_memory_prompts,
HumanMessagePromptTemplate.from_template(human_message_template),
]
return ChatPromptTemplate(input_variables=input_variables, messages=messages)
[docs] @classmethod
def from_llm_and_tools(
cls,
llm: BaseLanguageModel,
tools: Sequence[BaseTool],
callback_manager: Optional[BaseCallbackManager] = None,
output_parser: Optional[AgentOutputParser] = None,
prefix: str = PREFIX,
suffix: str = SUFFIX,
human_message_template: str = HUMAN_MESSAGE_TEMPLATE,
format_instructions: str = FORMAT_INSTRUCTIONS,
input_variables: Optional[List[str]] = None,
memory_prompts: Optional[List[BasePromptTemplate]] = None,
**kwargs: Any,
) -> Agent:
"""Construct an agent from an LLM and tools."""
cls._validate_tools(tools)
prompt = cls.create_prompt(
tools,
prefix=prefix,
suffix=suffix,
human_message_template=human_message_template,
format_instructions=format_instructions,
input_variables=input_variables,
memory_prompts=memory_prompts,
)
llm_chain = LLMChain(
llm=llm,
prompt=prompt,
callback_manager=callback_manager,
)
tool_names = [tool.name for tool in tools] | https://api.python.langchain.com/en/latest/_modules/langchain/agents/structured_chat/base.html |
cba691317bf1-3 | )
tool_names = [tool.name for tool in tools]
_output_parser = output_parser or cls._get_default_output_parser(llm=llm)
return cls(
llm_chain=llm_chain,
allowed_tools=tool_names,
output_parser=_output_parser,
**kwargs,
)
@property
def _agent_type(self) -> str:
raise ValueError | https://api.python.langchain.com/en/latest/_modules/langchain/agents/structured_chat/base.html |
c07438d62305-0 | Source code for langchain.agents.openai_functions_agent.base
"""Module implements an agent that uses OpenAI's APIs function enabled API."""
import json
from dataclasses import dataclass
from json import JSONDecodeError
from typing import Any, List, Optional, Sequence, Tuple, Union
from pydantic import root_validator
from langchain.agents import BaseSingleActionAgent
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.base import BaseCallbackManager
from langchain.callbacks.manager import Callbacks
from langchain.chat_models.openai import ChatOpenAI
from langchain.prompts.base import BasePromptTemplate
from langchain.prompts.chat import (
BaseMessagePromptTemplate,
ChatPromptTemplate,
HumanMessagePromptTemplate,
MessagesPlaceholder,
)
from langchain.schema import (
AgentAction,
AgentFinish,
AIMessage,
BaseMessage,
FunctionMessage,
OutputParserException,
SystemMessage,
)
from langchain.tools import BaseTool
from langchain.tools.convert_to_openai import format_tool_to_openai_function
@dataclass
class _FunctionsAgentAction(AgentAction):
message_log: List[BaseMessage]
def _convert_agent_action_to_messages(
agent_action: AgentAction, observation: str
) -> List[BaseMessage]:
"""Convert an agent action to a message.
This code is used to reconstruct the original AI message from the agent action.
Args:
agent_action: Agent action to convert.
Returns:
AIMessage that corresponds to the original tool invocation.
"""
if isinstance(agent_action, _FunctionsAgentAction):
return agent_action.message_log + [
_create_function_message(agent_action, observation)
]
else:
return [AIMessage(content=agent_action.log)] | https://api.python.langchain.com/en/latest/_modules/langchain/agents/openai_functions_agent/base.html |
c07438d62305-1 | ]
else:
return [AIMessage(content=agent_action.log)]
def _create_function_message(
agent_action: AgentAction, observation: str
) -> FunctionMessage:
"""Convert agent action and observation into a function message.
Args:
agent_action: the tool invocation request from the agent
observation: the result of the tool invocation
Returns:
FunctionMessage that corresponds to the original tool invocation
"""
if not isinstance(observation, str):
try:
content = json.dumps(observation, ensure_ascii=False)
except Exception:
content = str(observation)
else:
content = observation
return FunctionMessage(
name=agent_action.tool,
content=content,
)
def _format_intermediate_steps(
intermediate_steps: List[Tuple[AgentAction, str]],
) -> List[BaseMessage]:
"""Format intermediate steps.
Args:
intermediate_steps: Steps the LLM has taken to date, along with observations
Returns:
list of messages to send to the LLM for the next prediction
"""
messages = []
for intermediate_step in intermediate_steps:
agent_action, observation = intermediate_step
messages.extend(_convert_agent_action_to_messages(agent_action, observation))
return messages
def _parse_ai_message(message: BaseMessage) -> Union[AgentAction, AgentFinish]:
"""Parse an AI message."""
if not isinstance(message, AIMessage):
raise TypeError(f"Expected an AI message got {type(message)}")
function_call = message.additional_kwargs.get("function_call", {})
if function_call:
function_call = message.additional_kwargs["function_call"]
function_name = function_call["name"]
try: | https://api.python.langchain.com/en/latest/_modules/langchain/agents/openai_functions_agent/base.html |
c07438d62305-2 | function_name = function_call["name"]
try:
_tool_input = json.loads(function_call["arguments"])
except JSONDecodeError:
raise OutputParserException(
f"Could not parse tool input: {function_call} because "
f"the `arguments` is not valid JSON."
)
# HACK HACK HACK:
# The code that encodes tool input into Open AI uses a special variable
# name called `__arg1` to handle old style tools that do not expose a
# schema and expect a single string argument as an input.
# We unpack the argument here if it exists.
# Open AI does not support passing in a JSON array as an argument.
if "__arg1" in _tool_input:
tool_input = _tool_input["__arg1"]
else:
tool_input = _tool_input
content_msg = "responded: {content}\n" if message.content else "\n"
return _FunctionsAgentAction(
tool=function_name,
tool_input=tool_input,
log=f"\nInvoking: `{function_name}` with `{tool_input}`\n{content_msg}\n",
message_log=[message],
)
return AgentFinish(return_values={"output": message.content}, log=message.content)
[docs]class OpenAIFunctionsAgent(BaseSingleActionAgent):
"""An Agent driven by OpenAIs function powered API.
Args:
llm: This should be an instance of ChatOpenAI, specifically a model
that supports using `functions`.
tools: The tools this agent has access to.
prompt: The prompt for this agent, should support agent_scratchpad as one
of the variables. For an easy way to construct this prompt, use | https://api.python.langchain.com/en/latest/_modules/langchain/agents/openai_functions_agent/base.html |
c07438d62305-3 | of the variables. For an easy way to construct this prompt, use
`OpenAIFunctionsAgent.create_prompt(...)`
"""
llm: BaseLanguageModel
tools: Sequence[BaseTool]
prompt: BasePromptTemplate
[docs] def get_allowed_tools(self) -> List[str]:
"""Get allowed tools."""
return list([t.name for t in self.tools])
@root_validator
def validate_llm(cls, values: dict) -> dict:
if not isinstance(values["llm"], ChatOpenAI):
raise ValueError("Only supported with ChatOpenAI models.")
return values
@root_validator
def validate_prompt(cls, values: dict) -> dict:
prompt: BasePromptTemplate = values["prompt"]
if "agent_scratchpad" not in prompt.input_variables:
raise ValueError(
"`agent_scratchpad` should be one of the variables in the prompt, "
f"got {prompt.input_variables}"
)
return values
@property
def input_keys(self) -> List[str]:
"""Get input keys. Input refers to user input here."""
return ["input"]
@property
def functions(self) -> List[dict]:
return [dict(format_tool_to_openai_function(t)) for t in self.tools]
[docs] def plan(
self,
intermediate_steps: List[Tuple[AgentAction, str]],
callbacks: Callbacks = None,
**kwargs: Any,
) -> Union[AgentAction, AgentFinish]:
"""Given input, decided what to do.
Args:
intermediate_steps: Steps the LLM has taken to date, along with observations
**kwargs: User inputs.
Returns: | https://api.python.langchain.com/en/latest/_modules/langchain/agents/openai_functions_agent/base.html |
c07438d62305-4 | **kwargs: User inputs.
Returns:
Action specifying what tool to use.
"""
agent_scratchpad = _format_intermediate_steps(intermediate_steps)
selected_inputs = {
k: kwargs[k] for k in self.prompt.input_variables if k != "agent_scratchpad"
}
full_inputs = dict(**selected_inputs, agent_scratchpad=agent_scratchpad)
prompt = self.prompt.format_prompt(**full_inputs)
messages = prompt.to_messages()
predicted_message = self.llm.predict_messages(
messages, functions=self.functions, callbacks=callbacks
)
agent_decision = _parse_ai_message(predicted_message)
return agent_decision
[docs] async def aplan(
self,
intermediate_steps: List[Tuple[AgentAction, str]],
callbacks: Callbacks = None,
**kwargs: Any,
) -> Union[AgentAction, AgentFinish]:
"""Given input, decided what to do.
Args:
intermediate_steps: Steps the LLM has taken to date,
along with observations
**kwargs: User inputs.
Returns:
Action specifying what tool to use.
"""
agent_scratchpad = _format_intermediate_steps(intermediate_steps)
selected_inputs = {
k: kwargs[k] for k in self.prompt.input_variables if k != "agent_scratchpad"
}
full_inputs = dict(**selected_inputs, agent_scratchpad=agent_scratchpad)
prompt = self.prompt.format_prompt(**full_inputs)
messages = prompt.to_messages()
predicted_message = await self.llm.apredict_messages(
messages, functions=self.functions, callbacks=callbacks
)
agent_decision = _parse_ai_message(predicted_message) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/openai_functions_agent/base.html |
c07438d62305-5 | )
agent_decision = _parse_ai_message(predicted_message)
return agent_decision
[docs] @classmethod
def create_prompt(
cls,
system_message: Optional[SystemMessage] = SystemMessage(
content="You are a helpful AI assistant."
),
extra_prompt_messages: Optional[List[BaseMessagePromptTemplate]] = None,
) -> BasePromptTemplate:
"""Create prompt for this agent.
Args:
system_message: Message to use as the system message that will be the
first in the prompt.
extra_prompt_messages: Prompt messages that will be placed between the
system message and the new human input.
Returns:
A prompt template to pass into this agent.
"""
_prompts = extra_prompt_messages or []
messages: List[Union[BaseMessagePromptTemplate, BaseMessage]]
if system_message:
messages = [system_message]
else:
messages = []
messages.extend(
[
*_prompts,
HumanMessagePromptTemplate.from_template("{input}"),
MessagesPlaceholder(variable_name="agent_scratchpad"),
]
)
return ChatPromptTemplate(messages=messages)
[docs] @classmethod
def from_llm_and_tools(
cls,
llm: BaseLanguageModel,
tools: Sequence[BaseTool],
callback_manager: Optional[BaseCallbackManager] = None,
extra_prompt_messages: Optional[List[BaseMessagePromptTemplate]] = None,
system_message: Optional[SystemMessage] = SystemMessage(
content="You are a helpful AI assistant."
),
**kwargs: Any,
) -> BaseSingleActionAgent:
"""Construct an agent from an LLM and tools.""" | https://api.python.langchain.com/en/latest/_modules/langchain/agents/openai_functions_agent/base.html |
c07438d62305-6 | """Construct an agent from an LLM and tools."""
if not isinstance(llm, ChatOpenAI):
raise ValueError("Only supported with ChatOpenAI models.")
prompt = cls.create_prompt(
extra_prompt_messages=extra_prompt_messages,
system_message=system_message,
)
return cls(
llm=llm,
prompt=prompt,
tools=tools,
callback_manager=callback_manager,
**kwargs,
) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/openai_functions_agent/base.html |
e17f399bf20c-0 | Source code for langchain.agents.react.base
"""Chain that implements the ReAct paper from https://arxiv.org/pdf/2210.03629.pdf."""
from typing import Any, List, Optional, Sequence
from pydantic import Field
from langchain.agents.agent import Agent, AgentExecutor, AgentOutputParser
from langchain.agents.agent_types import AgentType
from langchain.agents.react.output_parser import ReActOutputParser
from langchain.agents.react.textworld_prompt import TEXTWORLD_PROMPT
from langchain.agents.react.wiki_prompt import WIKI_PROMPT
from langchain.agents.tools import Tool
from langchain.agents.utils import validate_tools_single_input
from langchain.base_language import BaseLanguageModel
from langchain.docstore.base import Docstore
from langchain.docstore.document import Document
from langchain.prompts.base import BasePromptTemplate
from langchain.tools.base import BaseTool
class ReActDocstoreAgent(Agent):
"""Agent for the ReAct chain."""
output_parser: AgentOutputParser = Field(default_factory=ReActOutputParser)
@classmethod
def _get_default_output_parser(cls, **kwargs: Any) -> AgentOutputParser:
return ReActOutputParser()
@property
def _agent_type(self) -> str:
"""Return Identifier of agent type."""
return AgentType.REACT_DOCSTORE
@classmethod
def create_prompt(cls, tools: Sequence[BaseTool]) -> BasePromptTemplate:
"""Return default prompt."""
return WIKI_PROMPT
@classmethod
def _validate_tools(cls, tools: Sequence[BaseTool]) -> None:
validate_tools_single_input(cls.__name__, tools)
super()._validate_tools(tools)
if len(tools) != 2: | https://api.python.langchain.com/en/latest/_modules/langchain/agents/react/base.html |
e17f399bf20c-1 | super()._validate_tools(tools)
if len(tools) != 2:
raise ValueError(f"Exactly two tools must be specified, but got {tools}")
tool_names = {tool.name for tool in tools}
if tool_names != {"Lookup", "Search"}:
raise ValueError(
f"Tool names should be Lookup and Search, got {tool_names}"
)
@property
def observation_prefix(self) -> str:
"""Prefix to append the observation with."""
return "Observation: "
@property
def _stop(self) -> List[str]:
return ["\nObservation:"]
@property
def llm_prefix(self) -> str:
"""Prefix to append the LLM call with."""
return "Thought:"
class DocstoreExplorer:
"""Class to assist with exploration of a document store."""
def __init__(self, docstore: Docstore):
"""Initialize with a docstore, and set initial document to None."""
self.docstore = docstore
self.document: Optional[Document] = None
self.lookup_str = ""
self.lookup_index = 0
def search(self, term: str) -> str:
"""Search for a term in the docstore, and if found save."""
result = self.docstore.search(term)
if isinstance(result, Document):
self.document = result
return self._summary
else:
self.document = None
return result
def lookup(self, term: str) -> str:
"""Lookup a term in document (if saved)."""
if self.document is None:
raise ValueError("Cannot lookup without a successful search first")
if term.lower() != self.lookup_str: | https://api.python.langchain.com/en/latest/_modules/langchain/agents/react/base.html |
e17f399bf20c-2 | if term.lower() != self.lookup_str:
self.lookup_str = term.lower()
self.lookup_index = 0
else:
self.lookup_index += 1
lookups = [p for p in self._paragraphs if self.lookup_str in p.lower()]
if len(lookups) == 0:
return "No Results"
elif self.lookup_index >= len(lookups):
return "No More Results"
else:
result_prefix = f"(Result {self.lookup_index + 1}/{len(lookups)})"
return f"{result_prefix} {lookups[self.lookup_index]}"
@property
def _summary(self) -> str:
return self._paragraphs[0]
@property
def _paragraphs(self) -> List[str]:
if self.document is None:
raise ValueError("Cannot get paragraphs without a document")
return self.document.page_content.split("\n\n")
[docs]class ReActTextWorldAgent(ReActDocstoreAgent):
"""Agent for the ReAct TextWorld chain."""
[docs] @classmethod
def create_prompt(cls, tools: Sequence[BaseTool]) -> BasePromptTemplate:
"""Return default prompt."""
return TEXTWORLD_PROMPT
@classmethod
def _validate_tools(cls, tools: Sequence[BaseTool]) -> None:
validate_tools_single_input(cls.__name__, tools)
super()._validate_tools(tools)
if len(tools) != 1:
raise ValueError(f"Exactly one tool must be specified, but got {tools}")
tool_names = {tool.name for tool in tools}
if tool_names != {"Play"}:
raise ValueError(f"Tool name should be Play, got {tool_names}") | https://api.python.langchain.com/en/latest/_modules/langchain/agents/react/base.html |
e17f399bf20c-3 | raise ValueError(f"Tool name should be Play, got {tool_names}")
[docs]class ReActChain(AgentExecutor):
"""Chain that implements the ReAct paper.
Example:
.. code-block:: python
from langchain import ReActChain, OpenAI
react = ReAct(llm=OpenAI())
"""
def __init__(self, llm: BaseLanguageModel, docstore: Docstore, **kwargs: Any):
"""Initialize with the LLM and a docstore."""
docstore_explorer = DocstoreExplorer(docstore)
tools = [
Tool(
name="Search",
func=docstore_explorer.search,
description="Search for a term in the docstore.",
),
Tool(
name="Lookup",
func=docstore_explorer.lookup,
description="Lookup a term in the docstore.",
),
]
agent = ReActDocstoreAgent.from_llm_and_tools(llm, tools)
super().__init__(agent=agent, tools=tools, **kwargs) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/react/base.html |
1848f4c9ddcc-0 | Source code for langchain.agents.mrkl.base
"""Attempt to implement MRKL systems as described in arxiv.org/pdf/2205.00445.pdf."""
from __future__ import annotations
from typing import Any, Callable, List, NamedTuple, Optional, Sequence
from pydantic import Field
from langchain.agents.agent import Agent, AgentExecutor, AgentOutputParser
from langchain.agents.agent_types import AgentType
from langchain.agents.mrkl.output_parser import MRKLOutputParser
from langchain.agents.mrkl.prompt import FORMAT_INSTRUCTIONS, PREFIX, SUFFIX
from langchain.agents.tools import Tool
from langchain.agents.utils import validate_tools_single_input
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.base import BaseCallbackManager
from langchain.chains import LLMChain
from langchain.prompts import PromptTemplate
from langchain.tools.base import BaseTool
class ChainConfig(NamedTuple):
"""Configuration for chain to use in MRKL system.
Args:
action_name: Name of the action.
action: Action function to call.
action_description: Description of the action.
"""
action_name: str
action: Callable
action_description: str
[docs]class ZeroShotAgent(Agent):
"""Agent for the MRKL chain."""
output_parser: AgentOutputParser = Field(default_factory=MRKLOutputParser)
@classmethod
def _get_default_output_parser(cls, **kwargs: Any) -> AgentOutputParser:
return MRKLOutputParser()
@property
def _agent_type(self) -> str:
"""Return Identifier of agent type."""
return AgentType.ZERO_SHOT_REACT_DESCRIPTION
@property
def observation_prefix(self) -> str: | https://api.python.langchain.com/en/latest/_modules/langchain/agents/mrkl/base.html |
1848f4c9ddcc-1 | @property
def observation_prefix(self) -> str:
"""Prefix to append the observation with."""
return "Observation: "
@property
def llm_prefix(self) -> str:
"""Prefix to append the llm call with."""
return "Thought:"
[docs] @classmethod
def create_prompt(
cls,
tools: Sequence[BaseTool],
prefix: str = PREFIX,
suffix: str = SUFFIX,
format_instructions: str = FORMAT_INSTRUCTIONS,
input_variables: Optional[List[str]] = None,
) -> PromptTemplate:
"""Create prompt in the style of the zero shot agent.
Args:
tools: List of tools the agent will have access to, used to format the
prompt.
prefix: String to put before the list of tools.
suffix: String to put after the list of tools.
input_variables: List of input variables the final prompt will expect.
Returns:
A PromptTemplate with the template assembled from the pieces here.
"""
tool_strings = "\n".join([f"{tool.name}: {tool.description}" for tool in tools])
tool_names = ", ".join([tool.name for tool in tools])
format_instructions = format_instructions.format(tool_names=tool_names)
template = "\n\n".join([prefix, tool_strings, format_instructions, suffix])
if input_variables is None:
input_variables = ["input", "agent_scratchpad"]
return PromptTemplate(template=template, input_variables=input_variables)
[docs] @classmethod
def from_llm_and_tools(
cls,
llm: BaseLanguageModel,
tools: Sequence[BaseTool], | https://api.python.langchain.com/en/latest/_modules/langchain/agents/mrkl/base.html |
1848f4c9ddcc-2 | llm: BaseLanguageModel,
tools: Sequence[BaseTool],
callback_manager: Optional[BaseCallbackManager] = None,
output_parser: Optional[AgentOutputParser] = None,
prefix: str = PREFIX,
suffix: str = SUFFIX,
format_instructions: str = FORMAT_INSTRUCTIONS,
input_variables: Optional[List[str]] = None,
**kwargs: Any,
) -> Agent:
"""Construct an agent from an LLM and tools."""
cls._validate_tools(tools)
prompt = cls.create_prompt(
tools,
prefix=prefix,
suffix=suffix,
format_instructions=format_instructions,
input_variables=input_variables,
)
llm_chain = LLMChain(
llm=llm,
prompt=prompt,
callback_manager=callback_manager,
)
tool_names = [tool.name for tool in tools]
_output_parser = output_parser or cls._get_default_output_parser()
return cls(
llm_chain=llm_chain,
allowed_tools=tool_names,
output_parser=_output_parser,
**kwargs,
)
@classmethod
def _validate_tools(cls, tools: Sequence[BaseTool]) -> None:
validate_tools_single_input(cls.__name__, tools)
if len(tools) == 0:
raise ValueError(
f"Got no tools for {cls.__name__}. At least one tool must be provided."
)
for tool in tools:
if tool.description is None:
raise ValueError(
f"Got a tool {tool.name} without a description. For this agent, "
f"a description must always be provided."
) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/mrkl/base.html |
1848f4c9ddcc-3 | f"a description must always be provided."
)
super()._validate_tools(tools)
[docs]class MRKLChain(AgentExecutor):
"""Chain that implements the MRKL system.
Example:
.. code-block:: python
from langchain import OpenAI, MRKLChain
from langchain.chains.mrkl.base import ChainConfig
llm = OpenAI(temperature=0)
prompt = PromptTemplate(...)
chains = [...]
mrkl = MRKLChain.from_chains(llm=llm, prompt=prompt)
"""
[docs] @classmethod
def from_chains(
cls, llm: BaseLanguageModel, chains: List[ChainConfig], **kwargs: Any
) -> AgentExecutor:
"""User friendly way to initialize the MRKL chain.
This is intended to be an easy way to get up and running with the
MRKL chain.
Args:
llm: The LLM to use as the agent LLM.
chains: The chains the MRKL system has access to.
**kwargs: parameters to be passed to initialization.
Returns:
An initialized MRKL chain.
Example:
.. code-block:: python
from langchain import LLMMathChain, OpenAI, SerpAPIWrapper, MRKLChain
from langchain.chains.mrkl.base import ChainConfig
llm = OpenAI(temperature=0)
search = SerpAPIWrapper()
llm_math_chain = LLMMathChain(llm=llm)
chains = [
ChainConfig(
action_name = "Search",
action=search.search,
action_description="useful for searching"
),
ChainConfig( | https://api.python.langchain.com/en/latest/_modules/langchain/agents/mrkl/base.html |
1848f4c9ddcc-4 | action_description="useful for searching"
),
ChainConfig(
action_name="Calculator",
action=llm_math_chain.run,
action_description="useful for doing math"
)
]
mrkl = MRKLChain.from_chains(llm, chains)
"""
tools = [
Tool(
name=c.action_name,
func=c.action,
description=c.action_description,
)
for c in chains
]
agent = ZeroShotAgent.from_llm_and_tools(llm, tools)
return cls(agent=agent, tools=tools, **kwargs) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/mrkl/base.html |
385ea07de428-0 | Source code for langchain.agents.agent_toolkits.playwright.toolkit
"""Playwright web browser toolkit."""
from __future__ import annotations
from typing import TYPE_CHECKING, List, Optional, Type, cast
from pydantic import Extra, root_validator
from langchain.agents.agent_toolkits.base import BaseToolkit
from langchain.tools.base import BaseTool
from langchain.tools.playwright.base import (
BaseBrowserTool,
lazy_import_playwright_browsers,
)
from langchain.tools.playwright.click import ClickTool
from langchain.tools.playwright.current_page import CurrentWebPageTool
from langchain.tools.playwright.extract_hyperlinks import ExtractHyperlinksTool
from langchain.tools.playwright.extract_text import ExtractTextTool
from langchain.tools.playwright.get_elements import GetElementsTool
from langchain.tools.playwright.navigate import NavigateTool
from langchain.tools.playwright.navigate_back import NavigateBackTool
if TYPE_CHECKING:
from playwright.async_api import Browser as AsyncBrowser
from playwright.sync_api import Browser as SyncBrowser
else:
try:
# We do this so pydantic can resolve the types when instantiating
from playwright.async_api import Browser as AsyncBrowser
from playwright.sync_api import Browser as SyncBrowser
except ImportError:
pass
[docs]class PlayWrightBrowserToolkit(BaseToolkit):
"""Toolkit for web browser tools."""
sync_browser: Optional["SyncBrowser"] = None
async_browser: Optional["AsyncBrowser"] = None
class Config:
"""Configuration for this pydantic object."""
extra = Extra.forbid
arbitrary_types_allowed = True
@root_validator
def validate_imports_and_browser_provided(cls, values: dict) -> dict:
"""Check that the arguments are valid."""
lazy_import_playwright_browsers() | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent_toolkits/playwright/toolkit.html |
385ea07de428-1 | """Check that the arguments are valid."""
lazy_import_playwright_browsers()
if values.get("async_browser") is None and values.get("sync_browser") is None:
raise ValueError("Either async_browser or sync_browser must be specified.")
return values
[docs] def get_tools(self) -> List[BaseTool]:
"""Get the tools in the toolkit."""
tool_classes: List[Type[BaseBrowserTool]] = [
ClickTool,
NavigateTool,
NavigateBackTool,
ExtractTextTool,
ExtractHyperlinksTool,
GetElementsTool,
CurrentWebPageTool,
]
tools = [
tool_cls.from_browser(
sync_browser=self.sync_browser, async_browser=self.async_browser
)
for tool_cls in tool_classes
]
return cast(List[BaseTool], tools)
[docs] @classmethod
def from_browser(
cls,
sync_browser: Optional[SyncBrowser] = None,
async_browser: Optional[AsyncBrowser] = None,
) -> PlayWrightBrowserToolkit:
"""Instantiate the toolkit."""
# This is to raise a better error than the forward ref ones Pydantic would have
lazy_import_playwright_browsers()
return cls(sync_browser=sync_browser, async_browser=async_browser) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent_toolkits/playwright/toolkit.html |
4935b06df2fc-0 | Source code for langchain.agents.agent_toolkits.openapi.toolkit
"""Requests toolkit."""
from __future__ import annotations
from typing import Any, List
from langchain.agents.agent import AgentExecutor
from langchain.agents.agent_toolkits.base import BaseToolkit
from langchain.agents.agent_toolkits.json.base import create_json_agent
from langchain.agents.agent_toolkits.json.toolkit import JsonToolkit
from langchain.agents.agent_toolkits.openapi.prompt import DESCRIPTION
from langchain.agents.tools import Tool
from langchain.base_language import BaseLanguageModel
from langchain.requests import TextRequestsWrapper
from langchain.tools import BaseTool
from langchain.tools.json.tool import JsonSpec
from langchain.tools.requests.tool import (
RequestsDeleteTool,
RequestsGetTool,
RequestsPatchTool,
RequestsPostTool,
RequestsPutTool,
)
class RequestsToolkit(BaseToolkit):
"""Toolkit for making requests."""
requests_wrapper: TextRequestsWrapper
def get_tools(self) -> List[BaseTool]:
"""Return a list of tools."""
return [
RequestsGetTool(requests_wrapper=self.requests_wrapper),
RequestsPostTool(requests_wrapper=self.requests_wrapper),
RequestsPatchTool(requests_wrapper=self.requests_wrapper),
RequestsPutTool(requests_wrapper=self.requests_wrapper),
RequestsDeleteTool(requests_wrapper=self.requests_wrapper),
]
[docs]class OpenAPIToolkit(BaseToolkit):
"""Toolkit for interacting with a OpenAPI api."""
json_agent: AgentExecutor
requests_wrapper: TextRequestsWrapper
[docs] def get_tools(self) -> List[BaseTool]:
"""Get the tools in the toolkit."""
json_agent_tool = Tool(
name="json_explorer",
func=self.json_agent.run,
description=DESCRIPTION,
) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent_toolkits/openapi/toolkit.html |
4935b06df2fc-1 | func=self.json_agent.run,
description=DESCRIPTION,
)
request_toolkit = RequestsToolkit(requests_wrapper=self.requests_wrapper)
return [*request_toolkit.get_tools(), json_agent_tool]
[docs] @classmethod
def from_llm(
cls,
llm: BaseLanguageModel,
json_spec: JsonSpec,
requests_wrapper: TextRequestsWrapper,
**kwargs: Any,
) -> OpenAPIToolkit:
"""Create json agent from llm, then initialize."""
json_agent = create_json_agent(llm, JsonToolkit(spec=json_spec), **kwargs)
return cls(json_agent=json_agent, requests_wrapper=requests_wrapper) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent_toolkits/openapi/toolkit.html |
a0c7db5c4fbc-0 | Source code for langchain.agents.agent_toolkits.openapi.base
"""OpenAPI spec agent."""
from typing import Any, Dict, List, Optional
from langchain.agents.agent import AgentExecutor
from langchain.agents.agent_toolkits.openapi.prompt import (
OPENAPI_PREFIX,
OPENAPI_SUFFIX,
)
from langchain.agents.agent_toolkits.openapi.toolkit import OpenAPIToolkit
from langchain.agents.mrkl.base import ZeroShotAgent
from langchain.agents.mrkl.prompt import FORMAT_INSTRUCTIONS
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.base import BaseCallbackManager
from langchain.chains.llm import LLMChain
[docs]def create_openapi_agent(
llm: BaseLanguageModel,
toolkit: OpenAPIToolkit,
callback_manager: Optional[BaseCallbackManager] = None,
prefix: str = OPENAPI_PREFIX,
suffix: str = OPENAPI_SUFFIX,
format_instructions: str = FORMAT_INSTRUCTIONS,
input_variables: Optional[List[str]] = None,
max_iterations: Optional[int] = 15,
max_execution_time: Optional[float] = None,
early_stopping_method: str = "force",
verbose: bool = False,
return_intermediate_steps: bool = False,
agent_executor_kwargs: Optional[Dict[str, Any]] = None,
**kwargs: Dict[str, Any],
) -> AgentExecutor:
"""Construct a json agent from an LLM and tools."""
tools = toolkit.get_tools()
prompt = ZeroShotAgent.create_prompt(
tools,
prefix=prefix,
suffix=suffix,
format_instructions=format_instructions,
input_variables=input_variables,
)
llm_chain = LLMChain( | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent_toolkits/openapi/base.html |
a0c7db5c4fbc-1 | input_variables=input_variables,
)
llm_chain = LLMChain(
llm=llm,
prompt=prompt,
callback_manager=callback_manager,
)
tool_names = [tool.name for tool in tools]
agent = ZeroShotAgent(llm_chain=llm_chain, allowed_tools=tool_names, **kwargs)
return AgentExecutor.from_agent_and_tools(
agent=agent,
tools=tools,
callback_manager=callback_manager,
verbose=verbose,
return_intermediate_steps=return_intermediate_steps,
max_iterations=max_iterations,
max_execution_time=max_execution_time,
early_stopping_method=early_stopping_method,
**(agent_executor_kwargs or {}),
) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent_toolkits/openapi/base.html |
46b195e8550c-0 | Source code for langchain.agents.agent_toolkits.python.base
"""Python agent."""
from typing import Any, Dict, Optional
from langchain.agents.agent import AgentExecutor, BaseSingleActionAgent
from langchain.agents.agent_toolkits.python.prompt import PREFIX
from langchain.agents.mrkl.base import ZeroShotAgent
from langchain.agents.openai_functions_agent.base import OpenAIFunctionsAgent
from langchain.agents.types import AgentType
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.base import BaseCallbackManager
from langchain.chains.llm import LLMChain
from langchain.schema import SystemMessage
from langchain.tools.python.tool import PythonREPLTool
[docs]def create_python_agent(
llm: BaseLanguageModel,
tool: PythonREPLTool,
agent_type: AgentType = AgentType.ZERO_SHOT_REACT_DESCRIPTION,
callback_manager: Optional[BaseCallbackManager] = None,
verbose: bool = False,
prefix: str = PREFIX,
agent_executor_kwargs: Optional[Dict[str, Any]] = None,
**kwargs: Dict[str, Any],
) -> AgentExecutor:
"""Construct a python agent from an LLM and tool."""
tools = [tool]
agent: BaseSingleActionAgent
if agent_type == AgentType.ZERO_SHOT_REACT_DESCRIPTION:
prompt = ZeroShotAgent.create_prompt(tools, prefix=prefix)
llm_chain = LLMChain(
llm=llm,
prompt=prompt,
callback_manager=callback_manager,
)
tool_names = [tool.name for tool in tools]
agent = ZeroShotAgent(llm_chain=llm_chain, allowed_tools=tool_names, **kwargs)
elif agent_type == AgentType.OPENAI_FUNCTIONS: | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent_toolkits/python/base.html |
46b195e8550c-1 | elif agent_type == AgentType.OPENAI_FUNCTIONS:
system_message = SystemMessage(content=prefix)
_prompt = OpenAIFunctionsAgent.create_prompt(system_message=system_message)
agent = OpenAIFunctionsAgent(
llm=llm,
prompt=_prompt,
tools=tools,
callback_manager=callback_manager,
**kwargs,
)
else:
raise ValueError(f"Agent type {agent_type} not supported at the moment.")
return AgentExecutor.from_agent_and_tools(
agent=agent,
tools=tools,
callback_manager=callback_manager,
verbose=verbose,
**(agent_executor_kwargs or {}),
) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent_toolkits/python/base.html |
b0822cf912d4-0 | Source code for langchain.agents.agent_toolkits.spark.base
"""Agent for working with pandas objects."""
from typing import Any, Dict, List, Optional
from langchain.agents.agent import AgentExecutor
from langchain.agents.agent_toolkits.spark.prompt import PREFIX, SUFFIX
from langchain.agents.mrkl.base import ZeroShotAgent
from langchain.callbacks.base import BaseCallbackManager
from langchain.chains.llm import LLMChain
from langchain.llms.base import BaseLLM
from langchain.tools.python.tool import PythonAstREPLTool
def _validate_spark_df(df: Any) -> bool:
try:
from pyspark.sql import DataFrame as SparkLocalDataFrame
return isinstance(df, SparkLocalDataFrame)
except ImportError:
return False
def _validate_spark_connect_df(df: Any) -> bool:
try:
from pyspark.sql.connect.dataframe import DataFrame as SparkConnectDataFrame
return isinstance(df, SparkConnectDataFrame)
except ImportError:
return False
[docs]def create_spark_dataframe_agent(
llm: BaseLLM,
df: Any,
callback_manager: Optional[BaseCallbackManager] = None,
prefix: str = PREFIX,
suffix: str = SUFFIX,
input_variables: Optional[List[str]] = None,
verbose: bool = False,
return_intermediate_steps: bool = False,
max_iterations: Optional[int] = 15,
max_execution_time: Optional[float] = None,
early_stopping_method: str = "force",
agent_executor_kwargs: Optional[Dict[str, Any]] = None,
**kwargs: Dict[str, Any],
) -> AgentExecutor:
"""Construct a spark agent from an LLM and dataframe.""" | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent_toolkits/spark/base.html |
b0822cf912d4-1 | ) -> AgentExecutor:
"""Construct a spark agent from an LLM and dataframe."""
if not _validate_spark_df(df) and not _validate_spark_connect_df(df):
raise ValueError("Spark is not installed. run `pip install pyspark`.")
if input_variables is None:
input_variables = ["df", "input", "agent_scratchpad"]
tools = [PythonAstREPLTool(locals={"df": df})]
prompt = ZeroShotAgent.create_prompt(
tools, prefix=prefix, suffix=suffix, input_variables=input_variables
)
partial_prompt = prompt.partial(df=str(df.first()))
llm_chain = LLMChain(
llm=llm,
prompt=partial_prompt,
callback_manager=callback_manager,
)
tool_names = [tool.name for tool in tools]
agent = ZeroShotAgent(
llm_chain=llm_chain,
allowed_tools=tool_names,
callback_manager=callback_manager,
**kwargs,
)
return AgentExecutor.from_agent_and_tools(
agent=agent,
tools=tools,
callback_manager=callback_manager,
verbose=verbose,
return_intermediate_steps=return_intermediate_steps,
max_iterations=max_iterations,
max_execution_time=max_execution_time,
early_stopping_method=early_stopping_method,
**(agent_executor_kwargs or {}),
) | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent_toolkits/spark/base.html |
6f6dbf4a4161-0 | Source code for langchain.agents.agent_toolkits.nla.toolkit
"""Toolkit for interacting with API's using natural language."""
from __future__ import annotations
from typing import Any, List, Optional, Sequence
from pydantic import Field
from langchain.agents.agent_toolkits.base import BaseToolkit
from langchain.agents.agent_toolkits.nla.tool import NLATool
from langchain.base_language import BaseLanguageModel
from langchain.requests import Requests
from langchain.tools.base import BaseTool
from langchain.tools.openapi.utils.openapi_utils import OpenAPISpec
from langchain.tools.plugin import AIPlugin
[docs]class NLAToolkit(BaseToolkit):
"""Natural Language API Toolkit Definition."""
nla_tools: Sequence[NLATool] = Field(...)
"""List of API Endpoint Tools."""
[docs] def get_tools(self) -> List[BaseTool]:
"""Get the tools for all the API operations."""
return list(self.nla_tools)
@staticmethod
def _get_http_operation_tools(
llm: BaseLanguageModel,
spec: OpenAPISpec,
requests: Optional[Requests] = None,
verbose: bool = False,
**kwargs: Any,
) -> List[NLATool]:
"""Get the tools for all the API operations."""
if not spec.paths:
return []
http_operation_tools = []
for path in spec.paths:
for method in spec.get_methods_for_path(path):
endpoint_tool = NLATool.from_llm_and_method(
llm=llm,
path=path,
method=method,
spec=spec,
requests=requests,
verbose=verbose,
**kwargs,
)
http_operation_tools.append(endpoint_tool)
return http_operation_tools | https://api.python.langchain.com/en/latest/_modules/langchain/agents/agent_toolkits/nla/toolkit.html |
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