Update app.py

app.py

@@ -4,7 +4,7 @@ import gradio as gr
 from langchain.schema import HumanMessage, AIMessage
 from langchain.chains import create_retrieval_chain, create_history_aware_retriever
 from langchain.chains.combine_documents import create_stuff_documents_chain
-from langchain.vectorstores import Chroma
+from langchain_community.vectorstores import Chroma
 from langchain_community.llms import HuggingFacePipeline
 from langchain.prompts import ChatPromptTemplate, MessagesPlaceholder
 from transformers import AutoTokenizer, AutoModelForCausalLM, BitsAndBytesConfig, pipeline