Update app.py

app.py

@@ -1,8 +1,11 @@
 import gradio as gr
 import PyPDF2
-from langchain.embeddings.openai import OpenAIEmbeddings
+#rom langchain.embeddings.openai import OpenAIEmbeddings
+from langchain.embeddings import HuggingFaceEmbeddings
 from langchain.vectorstores.faiss import FAISS
 from langchain.text_splitter import RecursiveCharacterTextSplitter
+from langchain import HuggingFaceHub
+
 from langchain import OpenAI, VectorDBQA
 
 import os
@@ -31,9 +34,11 @@ def pdf_to_text(pdf_file, query):
   embeddings = OpenAIEmbeddings()
   #vector store
   vectorstore = FAISS.from_texts(texts, embeddings)
+  llm = HuggingFaceHub(repo_id="google/flan-t5-xl", model_kwargs={"temperature":0, "max_length":512})
+
 
     #inference
-  qa = VectorDBQA.from_chain_type(llm=OpenAI(), chain_type="stuff", vectorstore=vectorstore)
+  qa = VectorDBQA.from_chain_type(llm=llm, chain_type="stuff", vectorstore=vectorstore)
   return qa.run(query)