adding application files

.env

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+OPENAI_API_KEY = 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

app.py

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+import os
+import gradio as gr
+from dotenv import load_dotenv
+from llama_index import GPTVectorStoreIndex, download_loader
+import openai
+
+load_dotenv()
+
+openai.api_key = os.getenv("OPENAI_API_KEY")
+
+UnstructuredReader = download_loader('UnstructuredReader', refresh_cache=True)
+loader = UnstructuredReader()
+
+def answer_question(pdf, question):
+    data = loader.load_data(pdf.name, split_documents=False)
+    index = GPTVectorStoreIndex.from_documents(data)
+    query_engine = index.as_query_engine()
+    response = query_engine.query(question)
+    return response
+
+iface = gr.Interface(fn=answer_question, 
+                     inputs=[gr.File(label="Upload a PDF file"), 
+                             gr.Textbox(label="Enter your question")], 
+                     outputs="text")
+
+iface.launch()

requirements.txt

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+gradio
+python-dotenv
+llama-index
+openai