Update app.py

app.py

@@ -22,8 +22,8 @@ from PyPDF2 import PdfReader
 from langchain.text_splitter import CharacterTextSplitter
 from langchain.embeddings import OpenAIEmbeddings, HuggingFaceInstructEmbeddings
 from langchain.vectorstores import FAISS # FAISS instead of PineCone
-# from langchain.llms import OpenAI
-#from langchain.llms import HuggingFaceHub
+from langchain.llms import OpenAI
+from langchain.llms import HuggingFaceHub
 from langchain.chat_models import ChatOpenAI
 from langchain.memory import ConversationBufferMemory
 from langchain.chains import ConversationalRetrievalChain
@@ -53,13 +53,12 @@ def get_vectorstore(text_chunks):
     vectorstore = FAISS.from_texts(texts=text_chunks, embedding=embeddings)
     return vectorstore
 
-    
-# google/flan-t5-xxl
+  
 
 def get_conversation_chain(vectorstore):
-    #llm = OpenAI()
-    llm = ChatOpenAI()
-    #llm = HuggingFaceHub(repo_id="bigscience/bloom", model_kwargs={"temperature":0.5, "max_length":512})
+    llm = OpenAI()
+    #llm = ChatOpenAI()
+    #llm = HuggingFaceHub(repo_id="google/flan-t5-xxl", model_kwargs={"temperature":0.5, "max_length":512})
     memory = ConversationBufferMemory(memory_key='chat_history', return_messages=True)
     conversation_chain = ConversationalRetrievalChain.from_llm(
         llm=llm,