Update app.py

app.py

@@ -8,7 +8,6 @@ from langchain.document_loaders import WebBaseLoader
 from langchain.schema import StrOutputParser
 from langchain.schema.prompt_template import format_document
 from langchain.schema.runnable import RunnablePassthrough
-from langchain.vectorstores import Chroma
 import google.generativeai as genai
 from langchain_google_genai import GoogleGenerativeAIEmbeddings
 from langchain_google_genai import ChatGoogleGenerativeAI