app.py

from transformers import AutoModelForCausalLM, AutoTokenizer, TextIteratorStreamer
import torch
import gradio as gr
from threading import Thread

base_model_id = "meta-llama/Meta-Llama-3-8B-Instruct"
new_model_id = "MohamedRashad/Arabic-Orpo-Llama-3-8B-Instruct"

# Reload tokenizer and model
tokenizer = AutoTokenizer.from_pretrained(base_model_id)
base_model = AutoModelForCausalLM.from_pretrained(
    base_model_id,
    torch_dtype=torch.bfloat16,
    device_map="auto",
).eval()
new_model = AutoModelForCausalLM.from_pretrained(
    new_model_id,
    torch_dtype=torch.bfloat16,
    device_map="auto",
).eval()
terminators = [
    tokenizer.eos_token_id,
    tokenizer.convert_tokens_to_ids("<|eot_id|>"),
]


def generate_both(system_prompt, input_text, base_chatbot, new_chatbot):
    base_text_streamer = TextIteratorStreamer(tokenizer, skip_prompt=True)
    new_text_streamer = TextIteratorStreamer(tokenizer, skip_prompt=True)

    system_prompt_list = [{"role": "system", "content": system_prompt}]
    input_text_list = [{"role": "user", "content": input_text}]

    base_chat_history = []
    for user, assistant in base_chatbot:
        base_chat_history.append({"role": "user", "content": user})
        base_chat_history.append({"role": "assistant", "content": assistant})

    new_chat_history = []
    for user, assistant in new_chatbot:
        new_chat_history.append({"role": "user", "content": user})
        new_chat_history.append({"role": "assistant", "content": assistant})
    
    base_messages = system_prompt_list + base_chat_history + input_text_list
    new_messages = system_prompt_list + new_chat_history + input_text_list

    base_input_ids = tokenizer.apply_chat_template(
        base_messages,
        add_generation_prompt=True,
        return_tensors="pt"
    ).to(base_model.device).long()

    new_input_ids = tokenizer.apply_chat_template(
        new_messages,
        add_generation_prompt=True,
        return_tensors="pt"
    ).to(new_model.device).long()

    base_generation_kwargs = dict(
        input_ids=base_input_ids,
        streamer=base_text_streamer,
        max_new_tokens=2048,
        eos_token_id=terminators,
        pad_token_id=tokenizer.eos_token_id,
        do_sample=True,
        temperature=0.2,
        top_p=0.9,
    )
    new_generation_kwargs = dict(
        input_ids=new_input_ids,
        streamer=new_text_streamer,
        max_new_tokens=2048,
        eos_token_id=terminators,
        pad_token_id=tokenizer.eos_token_id,
        do_sample=True,
        temperature=0.2,
        top_p=0.9,
    )

    base_thread = Thread(target=base_model.generate, kwargs=base_generation_kwargs)
    base_thread.start()

    base_chatbot.append([input_text, ""])
    new_chatbot.append([input_text, ""])
    
    for base_text in base_text_streamer:
        if "<|eot_id|>" in base_text:
            eot_location = base_text.find("<|eot_id|>")
            base_text = base_text[:eot_location]
        base_chatbot[-1][-1] += base_text
        yield base_chatbot, new_chatbot

    new_thread = Thread(target=new_model.generate, kwargs=new_generation_kwargs)
    new_thread.start()

    for new_text in new_text_streamer:
        if "<|eot_id|>" in new_text:
            eot_location = new_text.find("<|eot_id|>")
            new_text = new_text[:eot_location]
        new_chatbot[-1][-1] += new_text
        yield base_chatbot, new_chatbot

    return base_chatbot, new_chatbot

def clear():
    return [], []

with gr.Blocks(title="Arabic-ORPO-Llama3") as demo:
    with gr.Column():
        gr.HTML("<center><h1>Arabic Chatbot Comparison</h1></center>")
        system_prompt = gr.Textbox(lines=1, label="System Prompt", value="You are a pirate chatbot who always responds in pirate speak!")
        with gr.Row(variant="panel"):
            base_chatbot = gr.Chatbot(label=base_model_id, rtl=False, likeable=True, show_copy_button=True)
            new_chatbot = gr.Chatbot(label=new_model_id, rtl=True, likeable=True, show_copy_button=True)
        with gr.Row(variant="panel"):
            with gr.Column(scale=1):
                submit_btn = gr.Button(value="Generate", variant="primary")
                clear_btn = gr.Button(value="Clear", variant="secondary")
            input_text = gr.Textbox(lines=1, label="", value="مرحبا", rtl=True, text_align="right", scale=3, show_copy_button=True)

    input_text.submit(generate_both, inputs=[system_prompt, input_text, base_chatbot, new_chatbot], outputs=[base_chatbot, new_chatbot])
    submit_btn.click(generate_both, inputs=[system_prompt, input_text, base_chatbot, new_chatbot], outputs=[base_chatbot, new_chatbot])
    clear_btn.click(clear, outputs=[base_chatbot, new_chatbot])

demo.launch()