app.py

import argparse
import os
import requests

import gradio as gr

MODEL = "HuggingFaceH4/starchat-beta"
API_URL = f"https://api-inference.huggingface.co/models/{MODEL}"
HEADERS = {"Authorization": f"Bearer {os.environ['HUB_TOKEN']}"}

TITLE = """<h2 align="center">🚀 Falcon-Chat demo</h2>"""
USER_NAME = "User"
BOT_NAME = "Falcon"
DEFAULT_INSTRUCTIONS = f"""The following is a conversation between a highly knowledgeable and intelligent AI assistant, called Falcon, and a human user, called User. In the following interactions, User and Falcon will converse in natural language, and Falcon will answer User's questions. Falcon was built to be respectful, polite and inclusive. Falcon was built by the Technology Innovation Institute in Abu Dhabi. Falcon will never decline to answer a question, and always attempts to give an answer that User would be satisfied with. It knows a lot, and always tells the truth. The conversation begins.
"""
RETRY_COMMAND = "/retry"
STOP_STR = f"\n{USER_NAME}:"
STOP_SUSPECT_LIST = [":", "\n", "User"]

def run_model(prompt, temperature, top_p):
    payload = {
        "inputs": prompt,
        "parameters": {
            "max_new_tokens": 128,
            "do_sample": True,
            "temperature": temperature,
            "top_p": top_p
        }
    }
    response = requests.post(API_URL, headers=HEADERS, json=payload)
    return response.json()[0]['generated_text']

def get_stream(string: str):
    return enumerate(iter(string.split(" ")))

def chat_accordion():
    with gr.Accordion("Parameters", open=False):
        temperature = gr.Slider(
            minimum=0.1,
            maximum=2.0,
            value=0.8,
            step=0.1,
            interactive=True,
            label="Temperature",
        )
        top_p = gr.Slider(
            minimum=0.1,
            maximum=0.99,
            value=0.9,
            step=0.01,
            interactive=True,
            label="p (nucleus sampling)",
        )
    return temperature, top_p


def format_chat_prompt(message: str, chat_history, instructions: str) -> str:
    instructions = instructions.strip(" ").strip("\n")
    prompt = instructions
    for turn in chat_history:
        user_message, bot_message = turn
        prompt = f"{prompt}\n{USER_NAME}: {user_message}\n{BOT_NAME}: {bot_message}"
    prompt = f"{prompt}\n{USER_NAME}: {message}\n{BOT_NAME}:"
    return prompt


def chat():
    with gr.Column(elem_id="chat_container"):
        with gr.Row():
            chatbot = gr.Chatbot(elem_id="chatbot")
        with gr.Row():
            inputs = gr.Textbox(
                placeholder=f"Hello {BOT_NAME} !!",
                label="Type an input and press Enter",
                max_lines=3,
            )

    with gr.Row(elem_id="button_container"):
        with gr.Column():
            retry_button = gr.Button("♻️ Retry last turn")
        with gr.Column():
            delete_turn_button = gr.Button("🧽 Delete last turn")
        with gr.Column():
            clear_chat_button = gr.Button("✨ Delete all history")

    gr.Examples(
        [
            ["Hey Falcon! Any recommendations for my holidays in Abu Dhabi?"],
            ["What's the Everett interpretation of quantum mechanics?"],
            ["Give me a list of the top 10 dive sites you would recommend around the world."],
            ["Can you tell me more about deep-water soloing?"],
            ["Can you write a short tweet about the Apache 2.0 release of our latest AI model, Falcon LLM?"],
        ],
        inputs=inputs,
        label="Click on any example and press Enter in the input textbox!",
    )

    with gr.Row(elem_id="param_container"):
        with gr.Column():
            temperature, top_p = chat_accordion()
        with gr.Column():
            with gr.Accordion("Instructions", open=False):
                instructions = gr.Textbox(
                    placeholder="LLM instructions",
                    value=DEFAULT_INSTRUCTIONS,
                    lines=10,
                    interactive=True,
                    label="Instructions",
                    max_lines=16,
                    show_label=False,
                )

    def run_chat(message: str, chat_history, instructions: str, temperature: float, top_p: float):
        if not message or (message == RETRY_COMMAND and len(chat_history) == 0):
            yield chat_history
            return

        if message == RETRY_COMMAND and chat_history:
            prev_turn = chat_history.pop(-1)
            user_message, _ = prev_turn
            message = user_message

        prompt = format_chat_prompt(message, chat_history, instructions)
        chat_history = chat_history + [[message, ""]]
        model_output = run_model(
            prompt,
            temperature=temperature,
            top_p=top_p,
        )
        yield model_output
        # acc_text = ""
        # for idx, response in enumerate(stream):
        #     text_token = response.token.text

        #     if response.details:
        #         return

        #     if text_token in STOP_SUSPECT_LIST:
        #         acc_text += text_token
        #         continue

        #     if idx == 0 and text_token.startswith(" "):
        #         text_token = text_token[1:]

        #     acc_text += text_token
        #     last_turn = list(chat_history.pop(-1))
        #     last_turn[-1] += acc_text
        #     chat_history = chat_history + [last_turn]
        #     yield chat_history
        #     acc_text = ""

    def delete_last_turn(chat_history):
        if chat_history:
            chat_history.pop(-1)
        return {chatbot: gr.update(value=chat_history)}

    def run_retry(message: str, chat_history, instructions: str, temperature: float, top_p: float):
        yield from run_chat(RETRY_COMMAND, chat_history, instructions, temperature, top_p)

    def clear_chat():
        return []

    inputs.submit(
        run_chat,
        [inputs, chatbot, instructions, temperature, top_p],
        outputs=[chatbot],
        show_progress=False,
    )
    inputs.submit(lambda: "", inputs=None, outputs=inputs)
    delete_turn_button.click(delete_last_turn, inputs=[chatbot], outputs=[chatbot])
    retry_button.click(
        run_retry,
        [inputs, chatbot, instructions, temperature, top_p],
        outputs=[chatbot],
        show_progress=False,
    )
    clear_chat_button.click(clear_chat, [], chatbot)


def get_demo():
    with gr.Blocks(
        # css=None
        # css="""#chat_container {width: 700px; margin-left: auto; margin-right: auto;}
        #        #button_container {width: 700px; margin-left: auto; margin-right: auto;}
        #        #param_container {width: 700px; margin-left: auto; margin-right: auto;}"""
        css="""#chatbot {
    font-size: 14px;
    min-height: 300px;
}"""
    ) as demo:
        gr.HTML(TITLE)

        with gr.Row():
            with gr.Column():
                gr.Image("home-banner.jpg", elem_id="banner-image", show_label=False)
            with gr.Column():
                gr.Markdown(
                    """**Chat with [Falcon-40B-Instruct](https://huggingface.co/tiiuae/falcon-40b-instruct), brainstorm ideas, discuss your holiday plans, and more!**

                    ✨ This demo is powered by [Falcon-40B](https://huggingface.co/tiiuae/falcon-40b), finetuned on the [Baize](https://github.com/project-baize/baize-chatbot) dataset, and running with [Text Generation Inference](https://github.com/huggingface/text-generation-inference). [Falcon-40B](https://huggingface.co/tiiuae/falcon-40b) is a state-of-the-art large language model built by the [Technology Innovation Institute](https://www.tii.ae) in Abu Dhabi. It is trained on 1 trillion tokens (including [RefinedWeb](https://huggingface.co/datasets/tiiuae/falcon-refinedweb)) and available under the Apache 2.0 license. It currently holds the 🥇 1st place on the [🤗 Open LLM leaderboard](https://huggingface.co/spaces/HuggingFaceH4/open_llm_leaderboard). This demo is made available by the [HuggingFace H4 team](https://huggingface.co/HuggingFaceH4). 

                    🧪 This is only a **first experimental preview**: the [H4 team](https://huggingface.co/HuggingFaceH4) intends to provide increasingly capable versions of Falcon Chat in the future, based on improved datasets and RLHF/RLAIF.

                    👀 **Learn more about Falcon LLM:** [falconllm.tii.ae](https://falconllm.tii.ae/)

                    ➡️️ **Intended Use**: this demo is intended to showcase an early finetuning of [Falcon-40B](https://huggingface.co/tiiuae/falcon-40b), to illustrate the impact (and limitations) of finetuning on a dataset of conversations and instructions. We encourage the community to further build upon the base model, and to create even better instruct/chat versions!

                    ⚠️ **Limitations**: the model can and will produce factually incorrect information, hallucinating facts and actions. As it has not undergone any advanced tuning/alignment, it can produce problematic outputs, especially if prompted to do so. Finally, this demo is limited to a session length of about 1,000 words.
                    """
                )

        chat()

    return demo


if __name__ == "__main__":
    demo = get_demo()
    demo.queue(max_size=128, concurrency_count=16)
    demo.launch()