Create app.py

app.py

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+import gradio as gr
+import os
+import openai
+from dotenv import load_dotenv, find_dotenv
+from langchain import OpenAI, PromptTemplate
+from langchain.chains.summarize import load_summarize_chain
+from langchain.document_loaders import PyPDFLoader
+
+_ = load_dotenv(find_dotenv())
+openai.api_key = os.environ['OPENAI_API_KEY']
+llm = OpenAI(temperature=0)
+
+def pdf_summarizer(pdf):
+    loader = PyPDFLoader(pdf.name)
+    docs = loader.load_and_split()
+    chain = load_summarize_chain(llm, chain_type="map_reduce")
+    summary = chain.run(docs)
+    return summary
+
+inputs = gr.File(label="Upload only a PDF file")
+outputs = gr.Textbox(label="PDF Summary")
+
+iface = gr.Interface(
+    fn=pdf_summarizer, 
+    inputs=inputs, 
+    outputs=outputs
+    title="PDF Summarizer",
+)
+
+iface.launch()