Create app.py

app.py

@@ -0,0 +1,151 @@
+from typing import Any
+import gradio as gr
+from langchain.embeddings.openai import OpenAIEmbeddings
+from langchain.vectorstores import Chroma
+
+from langchain.chains import ConversationalRetrievalChain
+from langchain.chat_models import ChatOpenAI
+
+from langchain.document_loaders import PyPDFLoader
+
+import fitz
+from PIL import Image
+
+import chromadb
+import re
+import uuid 
+
+enable_box = gr.Textbox.update(value = None, placeholder = 'Upload your OpenAI API key',interactive = True)
+disable_box = gr.Textbox.update(value = 'OpenAI API key is Set', interactive = False)
+
+def set_apikey(api_key: str):
+        app.OPENAI_API_KEY = api_key        
+        return disable_box
+    
+def enable_api_box():
+        return enable_box
+
+def add_text(history, text: str):
+    if not text:
+         raise gr.Error('enter text')
+    history = history + [(text,'')] 
+    return history
+
+class my_app:
+    def __init__(self, OPENAI_API_KEY: str = None ) -> None:
+        self.OPENAI_API_KEY: str = OPENAI_API_KEY
+        self.chain = None
+        self.chat_history: list = []
+        self.N: int = 0
+        self.count: int = 0
+
+    def __call__(self, file: str) -> Any:
+        if self.count==0:
+            self.chain = self.build_chain(file)
+            self.count+=1
+        return self.chain
+    
+    def chroma_client(self):
+        #create a chroma client
+        client = chromadb.Client()
+        #create a collecyion
+        collection = client.get_or_create_collection(name="my-collection")
+        return client
+    
+    def process_file(self,file: str):
+        loader = PyPDFLoader(file.name)
+        documents = loader.load()  
+        pattern = r"/([^/]+)$"
+        match = re.search(pattern, file.name)
+        file_name = match.group(1)
+        return documents, file_name
+    
+    def build_chain(self, file: str):
+        documents, file_name = self.process_file(file)
+        #Load embeddings model
+        embeddings = OpenAIEmbeddings(openai_api_key=self.OPENAI_API_KEY) 
+        pdfsearch = Chroma.from_documents(documents, embeddings, collection_name= file_name,)
+        chain = ConversationalRetrievalChain.from_llm(
+                ChatOpenAI(temperature=0.0, openai_api_key=self.OPENAI_API_KEY), 
+                retriever=pdfsearch.as_retriever(search_kwargs={"k": 1}),
+                return_source_documents=True,)
+        return chain
+    
+
+def get_response(history, query, file): 
+        if not file:
+            raise gr.Error(message='Upload a PDF')    
+        chain = app(file)
+        result = chain({"question": query, 'chat_history':app.chat_history},return_only_outputs=True)
+        app.chat_history += [(query, result["answer"])]
+        app.N = list(result['source_documents'][0])[1][1]['page']
+        for char in result['answer']:
+           history[-1][-1] += char
+           yield history,''
+
+def render_file(file):
+        doc = fitz.open(file.name)
+        page = doc[app.N]
+        #Render the page as a PNG image with a resolution of 300 DPI
+        pix = page.get_pixmap(matrix=fitz.Matrix(300/72, 300/72))
+        image = Image.frombytes('RGB', [pix.width, pix.height], pix.samples)
+        return image
+
+def render_first(file):
+        doc = fitz.open(file.name)
+        page = doc[0]
+        #Render the page as a PNG image with a resolution of 300 DPI
+        pix = page.get_pixmap(matrix=fitz.Matrix(300/72, 300/72))
+        image = Image.frombytes('RGB', [pix.width, pix.height], pix.samples)
+        return image,[]
+
+app = my_app()
+with gr.Blocks() as demo:
+    with gr.Column():
+        with gr.Row():
+            with gr.Column(scale=0.8):
+                api_key = gr.Textbox(placeholder='Enter OpenAI API key', show_label=False, interactive=True).style(container=False)
+            with gr.Column(scale=0.2):
+                change_api_key = gr.Button('Change Key')
+        with gr.Row():           
+            chatbot = gr.Chatbot(value=[], elem_id='chatbot').style(height=650)
+            show_img = gr.Image(label='Upload PDF', tool='select' ).style(height=680)
+    with gr.Row():
+        with gr.Column(scale=0.60):
+            txt = gr.Textbox(
+                        show_label=False,
+                        placeholder="Enter text and press enter",
+                    ).style(container=False)
+        with gr.Column(scale=0.20):
+            submit_btn = gr.Button('submit')
+        with gr.Column(scale=0.20):
+            btn = gr.UploadButton("📁 upload a PDF", file_types=[".pdf"]).style()
+        
+    api_key.submit(
+            fn=set_apikey, 
+            inputs=[api_key], 
+            outputs=[api_key,])
+    change_api_key.click(
+            fn= enable_api_box,
+            outputs=[api_key])
+    btn.upload(
+            fn=render_first, 
+            inputs=[btn], 
+            outputs=[show_img,chatbot],)
+    
+    submit_btn.click(
+            fn=add_text, 
+            inputs=[chatbot,txt], 
+            outputs=[chatbot, ], 
+            queue=False).success(
+            fn=get_response,
+            inputs = [chatbot, txt, btn],
+            outputs = [chatbot,txt]).success(
+            fn=render_file,
+            inputs = [btn], 
+            outputs=[show_img]
+    )
+
+    
+demo.queue()
+demo.launch()