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| import gradio as gr | |
| import os | |
| import time | |
| from langchain.document_loaders import OnlinePDFLoader | |
| from langchain.text_splitter import CharacterTextSplitter | |
| from langchain.llms import OpenAI | |
| from langchain.embeddings import OpenAIEmbeddings | |
| from langchain.vectorstores import Chroma | |
| from langchain.chains import ConversationalRetrievalChain | |
| from langchain import PromptTemplate | |
| # _template = """Given the following conversation and a follow up question, rephrase the follow up question to be a standalone question. | |
| # Chat History: | |
| # {chat_history} | |
| # Follow Up Input: {question} | |
| # Standalone question:""" | |
| # CONDENSE_QUESTION_PROMPT = PromptTemplate.from_template(_template) | |
| # template = """ | |
| # You are given the following extracted parts of a long document and a question. Provide a short structured answer. | |
| # If you don't know the answer, look on the web. Don't try to make up an answer. | |
| # Question: {question} | |
| # ========= | |
| # {context} | |
| # ========= | |
| # Answer in Markdown:""" | |
| def loading_pdf(): | |
| return "Loading..." | |
| def pdf_changes(pdf_doc, open_ai_key): | |
| if openai_key is not None: | |
| os.environ['OPENAI_API_KEY'] = open_ai_key | |
| loader = OnlinePDFLoader(pdf_doc.name) | |
| documents = loader.load() | |
| text_splitter = CharacterTextSplitter(chunk_size=1000, chunk_overlap=0) | |
| texts = text_splitter.split_documents(documents) | |
| embeddings = OpenAIEmbeddings() | |
| db = Chroma.from_documents(texts, embeddings) | |
| retriever = db.as_retriever() | |
| global qa | |
| qa = ConversationalRetrievalChain.from_llm( | |
| llm=OpenAI(temperature=0.5), | |
| retriever=retriever, | |
| return_source_documents=True) | |
| return "Ready" | |
| else: | |
| return "You forgot OpenAI API key" | |
| def add_text(history, text): | |
| history = history + [(text, None)] | |
| return history, "" | |
| def bot(history): | |
| response = infer(history[-1][0], history) | |
| history[-1][1] = "" | |
| for character in response: | |
| history[-1][1] += character | |
| time.sleep(0.05) | |
| yield history | |
| def infer(question, history): | |
| res = [] | |
| for human, ai in history[:-1]: | |
| pair = (human, ai) | |
| res.append(pair) | |
| chat_history = res | |
| #print(chat_history) | |
| query = question | |
| result = qa({"question": query, "chat_history": chat_history}) | |
| #print(result) | |
| return result["answer"] | |
| css=""" | |
| #col-container {max-width: 700px; margin-left: auto; margin-right: auto;} | |
| """ | |
| title = """ | |
| <div style="text-align: center;max-width: 700px;"> | |
| <h1>YnP LangChain Test </h1> | |
| <p style="text-align: center;">Please specify OpenAI Key before use</p> | |
| </div> | |
| """ | |
| with gr.Blocks(css=css) as demo: | |
| with gr.Column(elem_id="col-container"): | |
| gr.HTML(title) | |
| with gr.Column(): | |
| openai_key = gr.Textbox(label="You OpenAI API key", type="password") | |
| pdf_doc = gr.File(label="Load a pdf", file_types=['.pdf'], type="file") | |
| with gr.Row(): | |
| langchain_status = gr.Textbox(label="Status", placeholder="", interactive=False) | |
| load_pdf = gr.Button("Load pdf to langchain") | |
| chatbot = gr.Chatbot([], elem_id="chatbot").style(height=350) | |
| question = gr.Textbox(label="Question", placeholder="Type your question and hit Enter ") | |
| submit_btn = gr.Button("Send Message") | |
| load_pdf.click(loading_pdf, None, langchain_status, queue=False) | |
| load_pdf.click(pdf_changes, inputs=[pdf_doc, openai_key], outputs=[langchain_status], queue=False) | |
| question.submit(add_text, [chatbot, question], [chatbot, question]).then( | |
| bot, chatbot, chatbot | |
| ) | |
| submit_btn.click(add_text, [chatbot, question], [chatbot, question]).then( | |
| bot, chatbot, chatbot) | |
| demo.launch() |