app.py

import gradio as gr
import torch
from transformers import AutoModelForCausalLM, AutoTokenizer
import os

# Model configuration
MODEL_NAME = "optiviseapp/kimi-linear-48b-a3b-instruct-fine-tune"

class ChatBot:
    def __init__(self):
        self.model = None
        self.tokenizer = None
        self.loaded = False
    
    def load_model(self):
        if self.loaded:
            return "✅ Model already loaded!"
        
        try:
            yield "🔄 Loading tokenizer..."
            self.tokenizer = AutoTokenizer.from_pretrained(MODEL_NAME, trust_remote_code=True)
            
            yield "🔄 Loading model (this takes 5-10 minutes)...\n\nThe 48B model is being distributed across 4 GPUs..."
            
            # Configure memory for 4 GPUs
            num_gpus = torch.cuda.device_count()
            max_memory = {i: f"{int(23)}GB" for i in range(num_gpus)}  # L4 has 24GB, leave 1GB
            
            self.model = AutoModelForCausalLM.from_pretrained(
                MODEL_NAME,
                torch_dtype=torch.bfloat16,
                device_map="balanced",  # Distribute evenly
                max_memory=max_memory,
                trust_remote_code=True,
                low_cpu_mem_usage=True,
            )
            
            self.model.eval()
            self.loaded = True
            
            # Get GPU distribution info
            if hasattr(self.model, 'hf_device_map'):
                device_info = "\n\n**GPU Distribution:**\n"
                devices = {}
                for name, device in self.model.hf_device_map.items():
                    if device not in devices:
                        devices[device] = 0
                    devices[device] += 1
                for device, count in devices.items():
                    device_info += f"- {device}: {count} layers\n"
            else:
                device_info = ""
            
            yield f"✅ **Model loaded successfully!**{device_info}\n\nYou can now start chatting below."
            
        except Exception as e:
            self.loaded = False
            yield f"❌ **Error loading model:**\n\n{str(e)}"
    
    def chat(self, message, history, system_prompt, max_tokens, temperature, top_p):
        if not self.loaded:
            return "❌ Please load the model first by clicking the 'Load Model' button."
        
        try:
            # Build prompt from history
            conversation = []
            if system_prompt.strip():
                conversation.append(f"System: {system_prompt}")
            
            for user_msg, bot_msg in history:
                conversation.append(f"User: {user_msg}")
                if bot_msg:
                    conversation.append(f"Assistant: {bot_msg}")
            
            conversation.append(f"User: {message}")
            conversation.append("Assistant:")
            
            prompt = "\n".join(conversation)
            
            # Tokenize
            inputs = self.tokenizer(prompt, return_tensors="pt")
            inputs = {k: v.to(self.model.device) for k, v in inputs.items()}
            
            # Generate
            with torch.no_grad():
                outputs = self.model.generate(
                    **inputs,
                    max_new_tokens=max_tokens,
                    temperature=temperature,
                    top_p=top_p,
                    do_sample=temperature > 0,
                    pad_token_id=self.tokenizer.eos_token_id,
                )
            
            # Decode
            response = self.tokenizer.decode(outputs[0], skip_special_tokens=True)
            
            # Extract assistant response
            if "Assistant:" in response:
                response = response.split("Assistant:")[-1].strip()
            
            return response
            
        except Exception as e:
            return f"❌ Error: {str(e)}"

# Initialize
bot = ChatBot()

# UI
with gr.Blocks(theme=gr.themes.Soft(), title="Kimi 48B Fine-tuned") as demo:
    gr.Markdown("""
    # 🚀 Kimi Linear 48B A3B - Fine-tuned
    
    Chat interface for the fine-tuned Kimi model.
    
    **Model:** `optiviseapp/kimi-linear-48b-a3b-instruct-fine-tune`
    """)
    
    # Show GPU info
    if torch.cuda.is_available():
        gpu_count = torch.cuda.device_count()
        gpu_name = torch.cuda.get_device_name(0)
        total_vram = sum(torch.cuda.get_device_properties(i).total_memory / 1024**3 for i in range(gpu_count))
        gr.Markdown(f"**Hardware:** {gpu_count}x {gpu_name} ({total_vram:.0f}GB total VRAM)")
    
    with gr.Row():
        with gr.Column(scale=1):
            gr.Markdown("### 🎛️ Controls")
            
            load_btn = gr.Button("🚀 Load Model", variant="primary", size="lg")
            status = gr.Markdown("**Status:** Model not loaded")
            
            gr.Markdown("---")
            gr.Markdown("### ⚙️ Settings")
            
            system_prompt = gr.Textbox(
                label="System Prompt",
                placeholder="You are a helpful assistant...",
                lines=2
            )
            
            max_tokens = gr.Slider(50, 2048, 512, label="Max Tokens", step=1)
            temperature = gr.Slider(0, 2, 0.7, label="Temperature", step=0.1)
            top_p = gr.Slider(0, 1, 0.9, label="Top P", step=0.05)
        
        with gr.Column(scale=2):
            gr.Markdown("### 💬 Chat")
            chatbot = gr.Chatbot(height=500, show_copy_button=True)
            
            with gr.Row():
                msg = gr.Textbox(label="Message", placeholder="Type here...", scale=4)
                send = gr.Button("Send", variant="primary", scale=1)
            
            clear = gr.Button("Clear")
    
    # Events
    load_btn.click(bot.load_model, outputs=status)
    
    def respond(message, history, system, max_tok, temp, top):
        bot_message = bot.chat(message, history, system, max_tok, temp, top)
        history.append((message, bot_message))
        return history, ""
    
    msg.submit(respond, [msg, chatbot, system_prompt, max_tokens, temperature, top_p], [chatbot, msg])
    send.click(respond, [msg, chatbot, system_prompt, max_tokens, temperature, top_p], [chatbot, msg])
    clear.click(lambda: None, None, chatbot)
    
    gr.Markdown("""
    ---
    **Model:** [optiviseapp/kimi-linear-48b-a3b-instruct-fine-tune](https://huggingface.co/optiviseapp/kimi-linear-48b-a3b-instruct-fine-tune)
    """)

if __name__ == "__main__":
    demo.launch(server_name="0.0.0.0", server_port=7860, share=True)