app.py

import gradio as gr
import re
from transformers import AutoModelForCausalLM, AutoTokenizer

model_name_or_path = "teknium/OpenHermes-2-Mistral-7B"
model = AutoModelForCausalLM.from_pretrained(model_name_or_path,
                                             device_map="auto",
                                             trust_remote_code=False,
                                             load_in_8bit=True,
                                             revision="main")
tokenizer = AutoTokenizer.from_pretrained(model_name_or_path, use_fast=True)

BASE_SYSTEM_MESSAGE = "I carefully provide accurate, factual, thoughtful, nuanced answers and am brilliant at reasoning."

def make_prediction(prompt, max_tokens=None, temperature=None, top_p=None, top_k=None, repetition_penalty=None):
    input_ids = tokenizer.encode(prompt, return_tensors="pt")
    out = model.generate(input_ids, max_length=max_tokens, temperature=temperature, top_p=top_p, top_k=top_k, repetition_penalty=repetition_penalty)
    text = tokenizer.decode(out[0], skip_special_tokens=True)
    yield text

def clear_chat(chat_history_state, chat_message):
    chat_history_state = []
    chat_message = ''
    return chat_history_state, chat_message

def user(message, history):
    history = history or []
    history.append([message, ""])
    return "", history

def chat(history, system_message, max_tokens, temperature, top_p, top_k, repetition_penalty):
    history = history or []
    
    # A última mensagem do usuário
    user_prompt = history[-1][0] if history else ""
    
    # Preparar a entrada para o modelo
    prompt_template = f'''system
{system_message.strip()}
user
{user_prompt}
assistant
'''
    input_ids = tokenizer(prompt_template, return_tensors='pt').input_ids
    
    # Gerar a saída
    output = model.generate(
        input_ids=input_ids,
        max_length=max_tokens,
        temperature=temperature,
        top_p=top_p,
        top_k=top_k,
        repetition_penalty=repetition_penalty
    )
    
    # Decodificar a saída
    decoded_output = tokenizer.decode(output[0])
    assistant_response = decoded_output.split('assistant')[-1].strip()  # Pegar apenas a última resposta do assistente
    
    # Atualizar o histórico
    if history:
        history[-1][1] += assistant_response
    else:
        history.append(["", assistant_response])
    
    return history, history, ""


start_message = ""

CSS ="""
.contain { display: flex; flex-direction: column; }
.gradio-container { height: 100vh !important; }
#component-0 { height: 100%; }
#chatbot { flex-grow: 1; overflow: auto; resize: vertical; }
"""
with gr.Blocks(css=CSS) as demo:
    with gr.Row():
        with gr.Column():
            gr.Markdown(f"""
                    ## This demo is an unquantized GPU chatbot of [Mistral-7B-OpenOrca](https://huggingface.co/Open-Orca/Mistral-7B-OpenOrca)
                    Brought to you by your friends at Alignment Lab AI, OpenChat, and Open Access AI Collective!
                    """)
    with gr.Row():
        gr.Markdown("# 🐋 Mistral-7B-OpenOrca Playground Space! 🐋")
    with gr.Row():
        #chatbot = gr.Chatbot().style(height=500)
        chatbot = gr.Chatbot(elem_id="chatbot")
    with gr.Row():
        message = gr.Textbox(
            label="What do you want to chat about?",
            placeholder="Ask me anything.",
            lines=3,
        )
    with gr.Row():
        submit = gr.Button(value="Send message", variant="secondary").style(full_width=True)
        clear = gr.Button(value="New topic", variant="secondary").style(full_width=False)
        stop = gr.Button(value="Stop", variant="secondary").style(full_width=False)
    with gr.Accordion("Show Model Parameters", open=False):
        with gr.Row():
            with gr.Column():
                max_tokens = gr.Slider(20, 2500, label="Max Tokens", step=20, value=500)
                temperature = gr.Slider(0.0, 2.0, label="Temperature", step=0.1, value=0.4)
                top_p = gr.Slider(0.0, 1.0, label="Top P", step=0.05, value=0.95)
                top_k = gr.Slider(1, 100, label="Top K", step=1, value=40)
                repetition_penalty = gr.Slider(1.0, 2.0, label="Repetition Penalty", step=0.1, value=1.1)

        system_msg = gr.Textbox(
            start_message, label="System Message", interactive=True, visible=True, placeholder="System prompt. Provide instructions which you want the model to remember.", lines=5)

    chat_history_state = gr.State()
    clear.click(clear_chat, inputs=[chat_history_state, message], outputs=[chat_history_state, message], queue=False)
    clear.click(lambda: None, None, chatbot, queue=False)

    submit_click_event = submit.click(
        fn=user, inputs=[message, chat_history_state], outputs=[message, chat_history_state], queue=True
    ).then(
        fn=chat, inputs=[chat_history_state, system_msg, max_tokens, temperature, top_p, top_k, repetition_penalty], outputs=[chatbot, chat_history_state, message], queue=True
    )
    stop.click(fn=None, inputs=None, outputs=None, cancels=[submit_click_event], queue=False)

demo.queue(max_size=128, concurrency_count=48).launch(debug=True, server_name="0.0.0.0", server_port=7860)