Update app.py

app.py

@@ -1,7 +1,7 @@
 import gradio as gr
 from langchain.embeddings.openai import OpenAIEmbeddings
 from langchain.text_splitter import CharacterTextSplitter
-from langchain.vectorstores import Chroma
+from langchain.vectorstores import Chroma, FAISS
 
 from langchain.chains import ConversationalRetrievalChain
 from langchain.chat_models import ChatOpenAI
@@ -46,7 +46,7 @@ def process_file(file):
 
     embeddings = OpenAIEmbeddings()
     
-    pdfsearch = Chroma.from_documents(documents, embeddings)
+    pdfsearch = FAISS.from_documents(documents, embeddings)
 
     chain = ConversationalRetrievalChain.from_llm(ChatOpenAI(temperature=0.3), 
                                    retriever=pdfsearch.as_retriever(search_kwargs={"k": 1}),