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| import os | |
| from typing import Optional, Tuple | |
| import gradio as gr | |
| from langchain.chains import ConversationChain | |
| from langchain.llms import OpenAI | |
| def load_chain(): | |
| """Logic for loading the chain you want to use should go here.""" | |
| llm = OpenAI(temperature=0) | |
| chain = ConversationChain(llm=llm) | |
| return chain | |
| def set_openai_api_key(api_key: str): | |
| """Set the api key and return chain. | |
| If no api_key, then None is returned. | |
| """ | |
| if api_key: | |
| os.environ["OPENAI_API_KEY"] = api_key | |
| chain = load_chain() | |
| os.environ["OPENAI_API_KEY"] = "" | |
| return chain | |
| def chat( | |
| inp: str, history: Optional[Tuple[str, str]], chain: Optional[ConversationChain] | |
| ): | |
| """Execute the chat functionality.""" | |
| history = history or [] | |
| # If chain is None, that is because no API key was provided. | |
| if chain is None: | |
| history.append((inp, "Please paste your OpenAI key to use")) | |
| return history, history | |
| # Run chain and append input. | |
| output = chain.run(input=inp) | |
| history.append((inp, output)) | |
| return history, history | |
| block = gr.Blocks(css=".gradio-container {background-color: lightgray}") | |
| with block: | |
| with gr.Row(): | |
| gr.Markdown("<h3><center>LangChain Demo</center></h3>") | |
| openai_api_key_textbox = gr.Textbox( | |
| placeholder="Paste your OpenAI API key (sk-...)", | |
| show_label=False, | |
| lines=1, | |
| type="password", | |
| ) | |
| chatbot = gr.Chatbot() | |
| with gr.Row(): | |
| message = gr.Textbox( | |
| label="What's your question?", | |
| placeholder="What's the answer to life, the universe, and everything?", | |
| lines=1, | |
| ) | |
| submit = gr.Button(value="Send", variant="secondary").style(full_width=False) | |
| gr.Examples( | |
| examples=[ | |
| "Hi! How's it going?", | |
| "What should I do tonight?", | |
| "Whats 2 + 2?", | |
| ], | |
| inputs=message, | |
| ) | |
| gr.HTML("Demo application of a LangChain chain.") | |
| gr.HTML( | |
| "<center>Powered by <a href='https://github.com/hwchase17/langchain'>LangChain 🦜️🔗</a></center>" | |
| ) | |
| state = gr.State() | |
| agent_state = gr.State() | |
| submit.click(chat, inputs=[message, state, agent_state], outputs=[chatbot, state]) | |
| message.submit(chat, inputs=[message, state, agent_state], outputs=[chatbot, state]) | |
| openai_api_key_textbox.change( | |
| set_openai_api_key, | |
| inputs=[openai_api_key_textbox], | |
| outputs=[agent_state], | |
| ) | |
| block.launch(debug=True) |