app.py

import deepsparse
import gradio as gr
from typing import Tuple, List

deepsparse.cpu.print_hardware_capability()

MODEL_ID = "hf:neuralmagic/Llama-2-7b-pruned70-retrained-ultrachat-quant-ds"

DESCRIPTION = f"""
# LLM Chat on CPU with DeepSparse
The model stub for this example is: {MODEL_ID}

#### Accelerated Inference on CPUs 
The Llama 2 model runs purely on CPU courtesy of [sparse software execution by DeepSparse](https://github.com/neuralmagic/deepsparse). 
DeepSparse provides accelerated inference by taking advantage of the model's weight sparsity to deliver tokens fast!
"""

MAX_MAX_NEW_TOKENS = 1024
DEFAULT_MAX_NEW_TOKENS = 200

# Setup the engine
pipe = deepsparse.Pipeline.create(
    task="text-generation",
    model_path=MODEL_ID,
    sequence_length=MAX_MAX_NEW_TOKENS,
    prompt_sequence_length=16,
    num_cores=8,
)


def clear_and_save_textbox(message: str) -> Tuple[str, str]:
    return "", message


def display_input(
    message: str, history: List[Tuple[str, str]]
) -> List[Tuple[str, str]]:
    history.append((message, ""))
    return history


def delete_prev_fn(history: List[Tuple[str, str]]) -> Tuple[List[Tuple[str, str]], str]:
    try:
        message, _ = history.pop()
    except IndexError:
        message = ""
    return history, message or ""


with gr.Blocks(css="style.css") as demo:
    gr.Markdown(DESCRIPTION)

    with gr.Group():
        chatbot = gr.Chatbot(label="Chatbot")
        with gr.Row():
            textbox = gr.Textbox(
                container=False,
                show_label=False,
                placeholder="Type a message...",
                scale=10,
            )
            submit_button = gr.Button("Submit", variant="primary", scale=1, min_width=0)

    with gr.Row():
        retry_button = gr.Button("🔄  Retry", variant="secondary")
        undo_button = gr.Button("↩️ Undo", variant="secondary")
        clear_button = gr.Button("🗑️  Clear", variant="secondary")

    saved_input = gr.State()

    gr.Examples(
        examples=["Write a story about sparse neurons."],
        inputs=[textbox],
    )

    max_new_tokens = gr.Slider(
        label="Max new tokens",
        value=DEFAULT_MAX_NEW_TOKENS,
        minimum=0,
        maximum=MAX_MAX_NEW_TOKENS,
        step=1,
        interactive=True,
        info="The maximum numbers of new tokens",
    )
    temperature = gr.Slider(
        label="Temperature",
        value=0.9,
        minimum=0.05,
        maximum=1.0,
        step=0.05,
        interactive=True,
        info="Higher values produce more diverse outputs",
    )
    top_p = gr.Slider(
        label="Top-p (nucleus) sampling",
        value=0.40,
        minimum=0.0,
        maximum=1,
        step=0.05,
        interactive=True,
        info="Higher values sample more low-probability tokens",
    )
    top_k = gr.Slider(
        label="Top-k sampling",
        value=20,
        minimum=1,
        maximum=100,
        step=1,
        interactive=True,
        info="Sample from the top_k most likely tokens",
    )
    reptition_penalty = gr.Slider(
        label="Repetition penalty",
        value=1.2,
        minimum=1.0,
        maximum=2.0,
        step=0.05,
        interactive=True,
        info="Penalize repeated tokens",
    )

    # Generation inference
    def generate(
        message,
        history,
        max_new_tokens: int,
        temperature: float,
        top_p: float,
        top_k: int,
        reptition_penalty: float,
    ):
        generation_config = {
            "max_new_tokens": max_new_tokens,
            "do_sample": True,
            "temperature": temperature,
            "top_p": top_p,
            "top_k": top_k,
            "reptition_penalty": reptition_penalty,
        }

        conversation = []
        conversation.append({"role": "user", "content": message})

        formatted_conversation = pipe.tokenizer.apply_chat_template(
            conversation, tokenize=False, add_generation_prompt=True
        )

        inference = pipe(
            sequences=formatted_conversation,
            generation_config=generation_config,
            streaming=True,
        )

        for token in inference:
            history[-1][1] += token.generations[0].text
            yield history

        print(pipe.timer_manager)

    # Hooking up all the buttons
    textbox.submit(
        fn=clear_and_save_textbox,
        inputs=textbox,
        outputs=[textbox, saved_input],
        api_name=False,
        queue=False,
    ).then(
        fn=display_input,
        inputs=[saved_input, chatbot],
        outputs=chatbot,
        api_name=False,
        queue=False,
    ).success(
        generate,
        inputs=[
            saved_input,
            chatbot,
            max_new_tokens,
            temperature,
            top_p,
            top_k,
            reptition_penalty,
        ],
        outputs=[chatbot],
        api_name=False,
    )

    submit_button.click(
        fn=clear_and_save_textbox,
        inputs=textbox,
        outputs=[textbox, saved_input],
        api_name=False,
        queue=False,
    ).then(
        fn=display_input,
        inputs=[saved_input, chatbot],
        outputs=chatbot,
        api_name=False,
        queue=False,
    ).success(
        generate,
        inputs=[
            saved_input,
            chatbot,
            max_new_tokens,
            temperature,
            top_p,
            top_k,
            reptition_penalty,
        ],
        outputs=[chatbot],
        api_name=False,
    )

    retry_button.click(
        fn=delete_prev_fn,
        inputs=chatbot,
        outputs=[chatbot, saved_input],
        api_name=False,
        queue=False,
    ).then(
        fn=display_input,
        inputs=[saved_input, chatbot],
        outputs=chatbot,
        api_name=False,
        queue=False,
    ).then(
        generate,
        inputs=[
            saved_input,
            chatbot,
            max_new_tokens,
            temperature,
            top_p,
            top_k,
            reptition_penalty,
        ],
        outputs=[chatbot],
        api_name=False,
    )

    undo_button.click(
        fn=delete_prev_fn,
        inputs=chatbot,
        outputs=[chatbot, saved_input],
        api_name=False,
        queue=False,
    ).then(
        fn=lambda x: x,
        inputs=[saved_input],
        outputs=textbox,
        api_name=False,
        queue=False,
    )

    clear_button.click(
        fn=lambda: ([], ""),
        outputs=[chatbot, saved_input],
        queue=False,
        api_name=False,
    )

demo.queue().launch(share=True)