Update app.py

app.py

@@ -3,7 +3,6 @@ import gradio as gr
 import asyncio
 from langchain_core.prompts import PromptTemplate
 from langchain_community.document_loaders import PyPDFLoader
-from langchain.chains.question_answering import load_qa_chain
 import torch
 from transformers import AutoTokenizer, AutoModelForCausalLM
 
@@ -42,8 +41,12 @@ input_file = gr.File(label="Upload PDF File")
 input_question = gr.Textbox(label="Ask about the document")
 output_text = gr.Textbox(label="Answer - Mistral Model")
 
-async def pdf_qa(file, question):
-    answer = await initialize(file.name, question)
+def pdf_qa(file, question):
+    if file is None:
+        return "Please upload a PDF file first."
+    
+    loop = asyncio.get_event_loop()
+    answer = loop.run_until_complete(initialize(file.name, question))
     return answer
 
 # Create Gradio Interface