Create app.py

app.py

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+from langchain.text_splitter import CharacterTextSplitter
+from langchain.vectorstores import FAISS
+from langchain.chat_models import ChatOpenAI
+from langchain_openai import AzureChatOpenAI,AzureOpenAIEmbeddings
+from langchain.memory import ConversationBufferMemory
+from langchain.chains import ConversationChain
+from langchain.chains import ConversationalRetrievalChain
+from langchain.document_loaders import UnstructuredFileLoader
+from typing import List, Dict, Tuple
+import gradio as gr
+import validators
+import requests
+import mimetypes
+import tempfile
+import os
+from langchain.chains.question_answering import load_qa_chain
+from langchain.llms import OpenAI
+from langchain.prompts import PromptTemplate
+from langchain.prompts.prompt import PromptTemplate
+import pandas as pd
+from langchain_experimental.agents.agent_toolkits import create_csv_agent
+from langchain_experimental.agents.agent_toolkits import create_pandas_dataframe_agent
+from langchain.agents import ZeroShotAgent, Tool, AgentExecutor
+from langchain.agents.agent_types import AgentType
+# from langchain.agents import create_csv_agent
+from langchain import OpenAI, LLMChain
+from openai import AzureOpenAI
+
+
+class ChatDocumentQA:
+    def __init__(self) -> None:
+        pass
+
+    def _get_empty_state(self) -> Dict[str, None]:
+        """Create an empty knowledge base."""
+        return {"knowledge_base": None}
+
+    def _extract_text_from_pdfs(self, file_paths: List[str]) -> List[str]:
+        """Extract text content from PDF files.
+
+        Args:
+            file_paths (List[str]): List of file paths.
+
+        Returns:
+            List[str]: Extracted text from the PDFs.
+        """
+        docs = []
+        loaders = [UnstructuredFileLoader(file_obj, strategy="fast") for file_obj in file_paths]
+        for loader in loaders:
+            docs.extend(loader.load())
+        return docs
+
+    def _get_content_from_url(self, urls: str) -> List[str]:
+        """Fetch content from given URLs.
+
+        Args:
+            urls (str): Comma-separated URLs.
+
+        Returns:
+            List[str]: List of text content fetched from the URLs.
+        """
+        file_paths = []
+        for url in urls.split(','):
+            if validators.url(url):
+                headers = {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36',}
+                r = requests.get(url, headers=headers)
+                if r.status_code != 200:
+                    raise ValueError("Check the url of your file; returned status code %s" % r.status_code)
+                content_type = r.headers.get("content-type")
+                file_extension = mimetypes.guess_extension(content_type)
+                temp_file = tempfile.NamedTemporaryFile(suffix=file_extension, delete=False)
+                temp_file.write(r.content)
+                file_paths.append(temp_file.name)
+
+        print("File_Paths:",file_paths)
+        docs = self._extract_text_from_pdfs(file_paths)
+        return docs
+
+    def _split_text_into_chunks(self, text: str) -> List[str]:
+        """Split text into smaller chunks.
+
+        Args:
+            text (str): Input text to be split.
+
+        Returns:
+            List[str]: List of smaller text chunks.
+        """
+        text_splitter = CharacterTextSplitter(separator="\n", chunk_size=6000, chunk_overlap=0, length_function=len)
+
+        chunks = text_splitter.split_documents(text)
+
+        return chunks
+        
+    def _create_vector_store_from_text_chunks(self, text_chunks: List[str]) -> FAISS:
+        """Create a vector store from text chunks.
+
+        Args:
+            text_chunks (List[str]): List of text chunks.
+
+        Returns:
+            FAISS: Vector store created from the text chunks.
+        """
+        embeddings = AzureOpenAIEmbeddings(
+                        azure_deployment="text-embedding-3-large",
+                    )
+
+        return FAISS.from_documents(documents=text_chunks, embedding=embeddings)
+
+
+    def _create_conversation_chain(self,vectorstore):
+
+        _template = """Given the following conversation and a follow up question, rephrase the follow up question to be a standalone question, in its original language.
+
+        Chat History:  {chat_history}
+        Follow Up Input: {question}
+        Standalone question:"""
+        CONDENSE_QUESTION_PROMPT = PromptTemplate.from_template(_template)
+
+        memory = ConversationBufferMemory(memory_key="chat_history", return_messages=True)
+
+        # llm = ChatOpenAI(temperature=0)
+        llm=AzureChatOpenAI(azure_deployment = "GPT-4o")
+
+        return ConversationalRetrievalChain.from_llm(llm=llm, retriever=vectorstore.as_retriever(),
+                                                     condense_question_prompt=CONDENSE_QUESTION_PROMPT,
+                                                     memory=memory)
+
+    def _get_documents_knowledge_base(self, file_paths: List[str]) -> Tuple[str, Dict[str, FAISS]]:
+        """Build knowledge base from uploaded files.
+
+        Args:
+            file_paths (List[str]): List of file paths.
+
+        Returns:
+            Tuple[str, Dict]: Tuple containing a status message and the knowledge base.
+        """
+        file_path = file_paths[0].name
+        file_extension = os.path.splitext(file_path)[1]
+
+        if file_extension == '.csv':  
+            # agent = self.create_agent(file_path)
+            # tools = self.get_agent_tools(agent)
+            # memory,tools,prompt = self.create_memory_for_csv_qa(tools)
+            # agent_chain = self.create_agent_chain_for_csv_qa(memory,tools,prompt)
+            agent_chain = create_csv_agent(
+                          AzureChatOpenAI(azure_deployment = "GPT-4o"),
+                          file_path,
+                          verbose=True,
+                          agent_type=AgentType.ZERO_SHOT_REACT_DESCRIPTION,
+            )
+            return "file uploaded", {"knowledge_base": agent_chain}
+            
+        else:
+            pdf_docs = [file_path.name for file_path in file_paths]
+            raw_text = self._extract_text_from_pdfs(pdf_docs)
+            text_chunks = self._split_text_into_chunks(raw_text)
+            vectorstore = self._create_vector_store_from_text_chunks(text_chunks)
+            return "file uploaded", {"knowledge_base": vectorstore}        
+
+
+    def _get_urls_knowledge_base(self, urls: str) -> Tuple[str, Dict[str, FAISS]]:
+        """Build knowledge base from URLs.
+
+        Args:
+            urls (str): Comma-separated URLs.
+
+        Returns:
+            Tuple[str, Dict]: Tuple containing a status message and the knowledge base.
+        """
+        webpage_text = self._get_content_from_url(urls)
+        text_chunks = self._split_text_into_chunks(webpage_text)
+        vectorstore = self._create_vector_store_from_text_chunks(text_chunks)
+        return "file uploaded", {"knowledge_base": vectorstore}
+
+#************************
+#   csv qa
+#************************
+    def create_agent(self,file_path):
+        agent_chain = create_csv_agent(
+        AzureChatOpenAI(azure_deployment = "GPT-4o"),
+        file_path,
+        verbose=True,
+        agent_type=AgentType.ZERO_SHOT_REACT_DESCRIPTION,
+        )
+        return agent_chain
+    def get_agent_tools(self,agent):
+      # search = agent
+      tools = [
+        Tool(
+            name="dataframe qa",
+            func=agent.run,
+            description="useful for when you need to answer questions about table data and dataframe data",
+        )
+      ]
+      return tools
+
+    def create_memory_for_csv_qa(self,tools):
+      prefix = """Have a conversation with a human, answering the following questions about table data and dataframe data as best you can. You have access to the following tools:"""
+      suffix = """Begin!"
+
+      {chat_history}
+      Question: {input}
+      {agent_scratchpad}"""
+
+      prompt = ZeroShotAgent.create_prompt(
+        tools,
+        prefix=prefix,
+        suffix=suffix,
+        input_variables=["input", "chat_history", "agent_scratchpad"],
+      )
+      memory = ConversationBufferMemory(memory_key="chat_history",return_messages=True)
+
+      return memory,tools,prompt
+
+    def create_agent_chain_for_csv_qa(self,memory,tools,prompt):
+
+        llm_chain = LLMChain(llm=AzureChatOpenAI(azure_deployment = "GPT-4o"), prompt=prompt)
+        agent = ZeroShotAgent(llm_chain=llm_chain, tools=tools, verbose=True)
+        agent_chain = AgentExecutor.from_agent_and_tools(
+            agent=agent, tools=tools, verbose=True, memory=memory
+        )
+
+        return agent_chain
+
+    def _get_response(self, message: str, chat_history: List[Tuple[str, str]], state: Dict[str, FAISS],file_paths) -> Tuple[str, List[Tuple[str, str]]]:
+        """Get a response from the chatbot.
+
+        Args:
+            message (str): User's message/question.
+            chat_history (List[Tuple[str, str]]): List of chat history as tuples of (user_message, bot_response).
+            state (dict): State containing the knowledge base.
+
+        Returns:
+            Tuple[str, List[Tuple[str, str]]]: Tuple containing a status message and updated chat history.
+        """
+        try:
+          if file_paths:
+            file_path = file_paths[0].name
+            file_extension = os.path.splitext(file_path)[1]
+
+            if file_extension == '.csv':
+                agent_chain = state["knowledge_base"]
+                response = agent_chain.run(input = message)
+                chat_history.append((message, response))
+                return "", chat_history
+            
+            else:
+                vectorstore = state["knowledge_base"]
+                chat = self._create_conversation_chain(vectorstore)
+                response = chat({"question": message,"chat_history": chat_history})
+                chat_history.append((message, response["answer"]))
+                return "", chat_history
+          else:
+                vectorstore = state["knowledge_base"]
+                chat = self._create_conversation_chain(vectorstore)
+                response = chat({"question": message,"chat_history": chat_history})
+                chat_history.append((message, response["answer"]))
+                return "", chat_history 
+        except:
+            chat_history.append((message, "Please Upload Document or URL"))
+            return "", chat_history
+
+    def gradio_interface(self) -> None:
+        """Create a Gradio interface for the chatbot."""
+        with gr.Blocks(css="#textbox_id textarea {color: white}",theme='SherlockRamos/Feliz') as demo:
+            gr.HTML("""
+              <style>
+                .footer {
+                    display: none !important;
+                }
+                footer {
+                    display: none !important;
+                }
+                #foot {
+                    display: none !important;
+                }
+                .svelte-1fzp3xt {
+                    display: none !important;
+                }
+                #root > div > div > div {
+                    padding-bottom: 0 !important;
+                }
+                .custom-footer {
+                    text-align: center;
+                    padding: 10px;
+                    font-size: 14px;
+                    color: #333;
+                }
+            </style>
+            """)
+            gr.HTML("""<div><img src="https://www.broadridge.com/_assets/images/logos/br-pimary-blue-logo.svg" alt="Broadridge" style="float:left;width:200px;height:50px;"><h1 style="color:#000;margin-left:5in;padding-top:10px">Virtual Assistant Chatbot</h1></div>""")     
+            
+            state = gr.State(self._get_empty_state())
+            chatbot = gr.Chatbot()
+            
+            with gr.Row():
+                with gr.Column(scale=0.85):
+                    msg = gr.Textbox(label="Question", elem_id="textbox_id") 
+                with gr.Column(scale=0.15):
+                    file_output = gr.Textbox(label="File Status")
+            with gr.Row():
+                with gr.Column(scale=0.85):
+                    clear = gr.ClearButton([msg, chatbot])
+                with gr.Column(scale=0.15):
+                    upload_button = gr.UploadButton(
+                        "Browse File",
+                        file_types=[".txt", ".pdf", ".doc", ".docx", ".csv"],
+                        file_count="multiple", variant="primary"
+                    )
+            with gr.Row():
+                with gr.Column(scale=1):
+                    input_url = gr.Textbox(label="urls", elem_id="textbox_id")
+
+            input_url.submit(self._get_urls_knowledge_base, input_url, [file_output, state])
+            upload_button.upload(self._get_documents_knowledge_base, upload_button, [file_output, state])
+            msg.submit(self._get_response, [msg, chatbot, state,upload_button], [msg, chatbot])
+
+        demo.launch(debug=True)
+
+
+if __name__ == "__main__":
+    chatdocumentqa = ChatDocumentQA()
+    chatdocumentqa.gradio_interface()