app.py

import gradio as gr
import os
import requests
import threading
from typing import List, Dict, Any

# Get the Hugging Face API key from Spaces secrets
HF_API_KEY = os.getenv("HF_API_KEY")

# Model endpoints configuration
MODEL_ENDPOINTS = {
    "Qwen2.5-72B-Instruct": "https://api-inference.huggingface.co/models/Qwen/Qwen2.5-72B-Instruct",
    "Llama3.3-70B-Instruct": "https://api-inference.huggingface.co/models/meta-llama/Llama-3.3-70B-Instruct",
    "Qwen2.5-Coder-32B-Instruct": "https://api-inference.huggingface.co/models/Qwen/Qwen2.5-Coder-32B-Instruct",
}

def query_model(model_name: str, messages: List[Dict[str, str]]) -> str:
    """Query a single model with the chat history"""
    endpoint = MODEL_ENDPOINTS[model_name]
    headers = {
        "Authorization": f"Bearer {HF_API_KEY}",
        "Content-Type": "application/json"
    }
    
    # Build full conversation history for context
    conversation = "\n".join([f"{msg['role']}: {msg['content']}" for msg in messages])
    
    # Model-specific prompt formatting with full history
    model_prompts = {
        "Qwen2.5-72B-Instruct": (
            f"<|im_start|>system\nCollaborate with other experts. Previous discussion:\n{conversation}<|im_end|>\n"
            "<|im_start|>assistant\nMy analysis:"
        ),
        "Llama3.3-70B-Instruct": (
            "<|begin_of_text|><|start_header_id|>system<|end_header_id|>\n"
            f"Build upon this discussion:\n{conversation}<|eot_id|>\n"
            "<|start_header_id|>assistant<|end_header_id|>\nMy contribution:"
        ),
        "Qwen2.5-Coder-32B-Instruct": (
            f"<|im_start|>system\nTechnical discussion context:\n{conversation}<|im_end|>\n"
            "<|im_start|>assistant\nTechnical perspective:"
        )
    }

    # Model-specific stop sequences
    stop_sequences = {
        "Qwen2.5-72B-Instruct": ["<|im_end|>", "<|endoftext|>"],
        "Llama3.3-70B-Instruct": ["<|eot_id|>", "\nuser:"],
        "Qwen2.5-Coder-32B-Instruct": ["<|im_end|>", "<|endoftext|>"]
    }

    payload = {
        "inputs": model_prompts[model_name],
        "parameters": {
            "max_tokens": 2048,
            "temperature": 0.7,
            "stop_sequences": stop_sequences[model_name],
            "return_full_text": False
        }
    }
    
    try:
        response = requests.post(endpoint, json=payload, headers=headers)
        response.raise_for_status()
        result = response.json()[0]['generated_text']
        # Clean up response formatting
        result = result.split('<|')[0]  # Remove any remaining special tokens
        result = result.replace('**', '').replace('##', '')  # Remove markdown
        result = result.strip()  # Remove leading/trailing whitespace
        return result  # Return complete response
    except Exception as e:
        return f"{model_name} error: {str(e)}"

def respond(message: str, history: List[List[str]]) -> str:
    """Handle continuous contextual conversations"""
    # Build full message history from previous interactions
    messages = []
    for user_msg, bot_msg in history:
        messages.append({"role": "user", "content": user_msg})
        messages.append({"role": "assistant", "content": bot_msg})
    
    # Add new user message
    messages.append({"role": "user", "content": message})
    
    # First model sees current prompt + full history
    response1 = query_model("Qwen2.5-Coder-32B-Instruct", messages)
    yield f"**Qwen2.5-Coder-32B-Instruct**:\n{response1}"
    
    # Second model sees current prompt + history + first response
    messages.append({"role": "assistant", "content": response1})
    response2 = query_model("Qwen2.5-72B-Instruct", messages)
    yield f"**Qwen2.5-72B-Instruct**:\n{response2}"
    
    # Third model sees current prompt + history + both responses
    messages.append({"role": "assistant", "content": response2})
    response3 = query_model("Llama3.3-70B-Instruct", messages)
    yield f"**Llama3.3-70B-Instruct**:\n{response3}"

# Create the Gradio interface
chat_interface = gr.ChatInterface(
    respond,
    title="Multi-LLM Collaboration Chat",
    description="A group chat with Qwen2.5-72B, Llama3.3-70B, and Qwen2.5-Coder-32B",
    examples=["How can I optimize Python code?", "Explain quantum computing basics"],
    theme="soft"
)

if __name__ == "__main__":
    chat_interface.launch(share=True)