app.py

import os
from pathlib import Path
import requests
import torch
from threading import Event, Thread
from transformers import AutoConfig, AutoTokenizer
from optimum.intel.openvino import OVModelForCausalLM
import openvino as ov
import openvino.properties as props
import openvino.properties.hint as hints
import openvino.properties.streams as streams
import gradio as gr

from llm_config import SUPPORTED_LLM_MODELS

# Initialize model language options
model_languages = list(SUPPORTED_LLM_MODELS)

# Define Gradio interface within a Blocks context
with gr.Blocks() as iface:
    # Dropdown for model language selection
    model_language = gr.Dropdown(
        choices=model_languages,
        value=model_languages[0],
        label="Model Language"
    )

    # Dropdown for model ID, dynamically populated
    model_id = gr.Dropdown(
        choices=[],  # will be populated dynamically
        label="Model",
        value=None
    )

    # Function to update model_id dropdown choices based on model_language
    def update_model_id(model_language_value):
        model_ids = list(SUPPORTED_LLM_MODELS[model_language_value])
        return gr.Dropdown.update(value=model_ids[0], choices=model_ids)

    # Update model_id choices when model_language changes
    model_language.change(update_model_id, inputs=model_language, outputs=model_id)

    # Checkbox for INT4 model preparation
    prepare_int4_model = gr.Checkbox(
        value=True,
        label="Prepare INT4 Model"
    )

    # Checkbox for enabling AWQ (shown conditionally)
    enable_awq = gr.Checkbox(
        value=False,
        label="Enable AWQ",
        visible=False  # visibility can be controlled in the UI logic
    )

    # Dropdown for device selection
    device = gr.Dropdown(
        choices=["CPU", "GPU"],
        value="CPU",
        label="Device"
    )

    # Function to retrieve model configuration and path
    def get_model_path(model_language_value, model_id_value):
        model_configuration = SUPPORTED_LLM_MODELS[model_language_value][model_id_value]
        pt_model_name = model_id_value.split("-")[0]
        int4_model_dir = Path(model_id_value) / "INT4_compressed_weights"
        return model_configuration, int4_model_dir, pt_model_name

    # Function to download the model if not already present
    def download_model_if_needed(model_language_value, model_id_value):
        model_configuration, int4_model_dir, pt_model_name = get_model_path(model_language_value, model_id_value)
        int4_weights = int4_model_dir / "openvino_model.bin"
        if not int4_weights.exists():
            print(f"Downloading model {model_id_value}...")
            # Download logic (e.g., requests.get(model_configuration["model_url"])) can go here
        return int4_model_dir

    # Load the model based on selected options
    def load_model(model_language_value, model_id_value):
        int4_model_dir = download_model_if_needed(model_language_value, model_id_value)
        ov_config = {
            hints.performance_mode(): hints.PerformanceMode.LATENCY,
            streams.num(): "1",
            props.cache_dir(): ""
        }
        core = ov.Core()
        tok = AutoTokenizer.from_pretrained(int4_model_dir, trust_remote_code=True)
        ov_model = OVModelForCausalLM.from_pretrained(
            int4_model_dir,
            device=device.value,
            ov_config=ov_config,
            config=AutoConfig.from_pretrained(int4_model_dir, trust_remote_code=True),
            trust_remote_code=True
        )
        return tok, ov_model

    # Gradio sliders for model generation parameters
    temperature = gr.Slider(minimum=0.0, maximum=1.0, value=0.7, label="Temperature")
    top_p = gr.Slider(minimum=0.0, maximum=1.0, value=0.9, label="Top P")
    top_k = gr.Slider(minimum=0, maximum=50, value=50, label="Top K")
    repetition_penalty = gr.Slider(minimum=1.0, maximum=2.0, value=1.1, label="Repetition Penalty")

    # Conversation history state
    history = gr.State([])

    # Function to generate responses based on model and input
    def generate_response(history, temperature, top_p, top_k, repetition_penalty, model_language_value, model_id_value):
        tok, ov_model = load_model(model_language_value, model_id_value)

        def convert_history_to_token(history):
            input_tokens = tok(" ".join([msg[0] for msg in history]), return_tensors="pt").input_ids
            return input_tokens
        
        input_ids = convert_history_to_token(history)
        streamer = gr.Textbox.update()

        generate_kwargs = dict(
            input_ids=input_ids,
            max_new_tokens=256,
            temperature=temperature,
            top_p=top_p,
            top_k=top_k,
            repetition_penalty=repetition_penalty,
            streamer=streamer
        )
        
        event = Event()
        def generate_and_signal_complete():
            ov_model.generate(**generate_kwargs)
            event.set()
        
        t1 = Thread(target=generate_and_signal_complete)
        t1.start()

        partial_text = ""
        for new_text in streamer:
            partial_text += new_text
            history[-1][1] = partial_text
            yield history

    # Set up the interface with inputs and outputs
    iface = gr.Interface(
        fn=generate_response,
        inputs=[history, temperature, top_p, top_k, repetition_penalty, model_language, model_id],
        outputs=[gr.Textbox(label="Conversation History"), history],
        live=True,
        title="OpenVINO Chatbot"
    )

# Launch the Gradio app
if __name__ == "__main__":
    iface.launch(debug=True, share=True, server_name="0.0.0.0", server_port=7860)