Add multiple file upload

app.py

@@ -33,7 +33,7 @@ def pdf_changes(pdf_doc, open_ai_key):
         qa = ConversationalRetrievalChain.from_llm(
             llm=OpenAI(temperature=0.5), 
             retriever=retriever, 
-            return_source_documents=False)
+            return_source_documents=True)
         return "Ready"
     else:
         return "You forgot OpenAI API key"
@@ -52,8 +52,7 @@ def bot(history):
         yield history
     
 
-def infer(question, history):
-    
+def infer(question, history):  
     res = []
     for human, ai in history[:-1]:
         pair = (human, ai)
@@ -72,10 +71,8 @@ css="""
 
 title = """
 <div style="text-align: center;max-width: 700px;">
-    <h1>Chat with PDF • OpenAI</h1>
-    <p style="text-align: center;">Upload a .PDF from your computer, click the "Load PDF to LangChain" button, <br />
-    when everything is ready, you can start asking questions about the pdf ;) <br />
-    This version is set to store chat history, and uses OpenAI as LLM, don't forget to copy/paste your OpenAI API key</p>
+    <h1>YnP LangChain Test </h1>
+    <p style="text-align: center;">Please specify OpenAI Key before use</p>
 </div>
 """
 
@@ -86,7 +83,7 @@ with gr.Blocks(css=css) as demo:
         
         with gr.Column():
             openai_key = gr.Textbox(label="You OpenAI API key", type="password")
-            pdf_doc = gr.File(label="Load a pdf", file_types=['.pdf'], type="file")
+            pdf_doc = gr.File(label="Load a pdf", file_count="multiple", file_types=['.pdf'], type="file")
             with gr.Row():
                 langchain_status = gr.Textbox(label="Status", placeholder="", interactive=False)
                 load_pdf = gr.Button("Load pdf to langchain")
@@ -94,6 +91,7 @@ with gr.Blocks(css=css) as demo:
         chatbot = gr.Chatbot([], elem_id="chatbot").style(height=350)
         question = gr.Textbox(label="Question", placeholder="Type your question and hit Enter ")
         submit_btn = gr.Button("Send Message")
+        
     load_pdf.click(loading_pdf, None, langchain_status, queue=False)    
     load_pdf.click(pdf_changes, inputs=[pdf_doc, openai_key], outputs=[langchain_status], queue=False)
     question.submit(add_text, [chatbot, question], [chatbot, question]).then(