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import streamlit as st
from transformers import MarianTokenizer, MarianMTModel
import torch
LANGUAGES = {
"en": ("English", "English"), "fr": ("Français", "French"), "es": ("Español", "Spanish"),
"de": ("Deutsch", "German"), "hi": ("हिन्दी", "Hindi"), "zh": ("中文", "Chinese"),
"ar": ("العربية", "Arabic"), "ru": ("Русский", "Russian"), "ja": ("日本語", "Japanese")
}
@st.cache_resource
def _load_default_model():
model_name = "Helsinki-NLP/opus-mt-en-hi"
tokenizer = MarianTokenizer.from_pretrained(model_name)
model = MarianMTModel.from_pretrained(model_name)
return tokenizer, model
@st.cache_resource
def load_model(source_lang, target_lang):
try:
if source_lang == target_lang:
return _load_default_model()
model_name = f"Helsinki-NLP/opus-mt-{source_lang}-{target_lang}"
tokenizer = MarianTokenizer.from_pretrained(model_name)
model = MarianMTModel.from_pretrained(model_name)
return tokenizer, model
except Exception as e:
st.warning(f"No direct model for {source_lang} to {target_lang}. Using en-hi fallback.")
return _load_default_model()
@st.cache_data(ttl=3600)
def translate_cached(text, source_lang, target_lang):
tokenizer, model = load_model(source_lang, target_lang)
inputs = tokenizer(text, return_tensors="pt", padding=True, truncation=True, max_length=500)
with torch.no_grad():
translated = model.generate(**inputs, max_length=500, num_beams=2, early_stopping=True)
translated_text = tokenizer.decode(translated[0], skip_special_tokens=True)
return translated_text if translated_text.strip() and len(translated_text.split()) >= 2 else text
def translate(text, source_lang, target_lang):
if not text:
return "No text provided."
try:
return translate_cached(text, source_lang, target_lang)
except Exception as e:
st.error(f"Translation error: {str(e)}. Using input as fallback.")
return text
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