Create app.py

app.py

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+import gradio as gr
+from langchain.text_splitter import CharacterTextSplitter
+from langchain.llms import HuggingFaceHub
+from langchain.embeddings import HuggingFaceEmbeddings
+from langchain.vectorstores import Chroma
+from langchain.chains import RetrievalQA
+from langchain.document_loaders import PyMuPDFLoader
+
+with gr.Blocks() as demo:
+    pdf_file = gr.File(label='file upload', file_type='.pdf')
+
+demo.launch()