Update app.py

app.py

@@ -2,7 +2,7 @@ import gradio as gr
 import torch
 from transformers import AutoModelForSeq2SeqLM, AutoTokenizer, pipeline
 import chromadb
-from langchain.vectorstores import Chroma
+from langchain_community.vectorstores import Chroma
 from langchain_huggingface import HuggingFaceEmbeddings, HuggingFacePipeline
 from langchain.chains import create_retrieval_chain, LLMChain
 from langchain.prompts import PromptTemplate