Update app.py

app.py

@@ -12,18 +12,18 @@ from PyPDF2 import PdfReader
 from PyPDF2 import PdfWriter
 from langchain.embeddings.openai import OpenAIEmbeddings
 from langchain.text_splitter import CharacterTextSplitter
-from langchain.vectorstores import ElasticVectorSearch, Pinecone, Weaviate, FAISS
+#from langchain.vectorstores import ElasticVectorSearch, Pinecone, Weaviate, FAISS
 from langchain.chains.question_answering import load_qa_chain
 from langchain.llms import OpenAI
 
 from langchain.embeddings.openai import OpenAIEmbeddings
-from langchain.vectorstores import Chroma
-from langchain.text_splitter import TokenTextSplitter
+#from langchain.vectorstores import Chroma
+#from langchain.text_splitter import TokenTextSplitter
 #from langchain.llms import OpenAI
 from langchain import OpenAI
 from langchain.chat_models import ChatOpenAI
-from langchain.chains import ChatVectorDBChain
-from langchain.chains import RetrievalQA
+#from langchain.chains import ChatVectorDBChain
+#from langchain.chains import RetrievalQA
 from langchain.document_loaders import PyPDFLoader
 from langchain.chains.question_answering import load_qa_chain