Update app.py

app.py

@@ -3,7 +3,7 @@ from transformers import AutoTokenizer, AutoModelForCausalLM, pipeline
 from langchain_huggingface import HuggingFacePipeline  # Updated import
 from langchain_core.prompts import PromptTemplate
 from langchain_core.runnables import RunnableLambda
-from langchain_core.memory import ConversationBufferMemory
+from langchain.memory import ConversationBufferMemory
 
 # Load model and tokenizer
 model_name = "microsoft/DialoGPT-medium"