app.py

import gradio as gr
import pandas as pd
import plotly.express as px
import plotly.graph_objects as go
from collections import Counter
import torch
from transformers import AutoTokenizer, AutoModelForCausalLM
import re
import logging
from typing import List, Dict, Any
import gc
import os

# Set up logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

print("hf_toke_fromglobal", os.environ.get("HF_TOKEN"))
# Model configurations - maps display names to HF model paths
PREDEFINED_MODELS = [
     "meta-llama/Llama-3.2-1B",
     "google/gemma-2-2b",
     "Qwen/Qwen3-0.6B",
     "Qwen/Qwen2.5-0.5B",
     "Qwen/Qwen2.5-1.5B",
     "bigscience/bloom-560m",
     "CohereForAI/aya-expanse-8b",
     "common-pile/comma-v0.1-2t",
     "google/byt5-small",
     "gsaltintas/supertoken_models-llama_gpt2",
     "gsaltintas/supertoken_models-llama_google-gemma-2-2b"
]
# Global cache for loaded models
model_cache = {}

def parse_dataset(text):
    """Parse the input dataset text into structured questions"""
    if not text.strip():
        return [], "Please enter your dataset"
    
    lines = text.strip().split('\n')
    if len(lines) < 2:
        return [], "Dataset must have at least a header and one question"
    
    # Skip header and detect delimiter
    first_data_line = lines[1] if len(lines) > 1 else lines[0]
    delimiter = '\t' if '\t' in first_data_line else ','
    
    questions = []
    errors = []
    
    for i, line in enumerate(lines[1:], 2):  # Start from line 2 (after header)
        line = line.strip()
        if not line:
            continue
            
        parts = [part.strip().strip('"') for part in line.split(delimiter)]
        
        if len(parts) < 5:
            errors.append(f"Line {i}: Not enough columns (need 5, got {len(parts)})")
            continue
            
        question = {
            'question': parts[0],
            'correct_answer': parts[1],
            'choices': [parts[2], parts[3], parts[4]]
        }
        
        # Ensure correct answer is in choices
        if question['correct_answer'] not in question['choices']:
            question['choices'].append(question['correct_answer'])
        
        questions.append(question)
    
    error_msg = '\n'.join(errors) if errors else ""
    return questions, error_msg

def setup_tokenizer(model_path):
    tokenizer_name = model_path
    if "supertoken" in model_path:
        from huggingface_hub import list_repo_files, hf_hub_download
        import json
        files = list_repo_files(model_path)
        if "tokenizer_config.json" in files:
            tokenizer_path = hf_hub_download(repo_id=model_path, filename="tokenizer_config.json")
            with open(tokenizer_path) as f:
                tok_config = json.load(f)["data"]["tokenizer"]
            if tok_config["name"] == "huggingface":
                tokenizer_name = tok_config["path"]
            # todo: tiktoken
    tokenizer = AutoTokenizer.from_pretrained(tokenizer_name, trust_remote_code=True, legacy=True)
    return tokenizer


def load_model_and_tokenizer(model_path, use_cache=True, progress_callback=None):
    """Load model and tokenizer with caching"""
    global model_cache
    
    if use_cache and model_path in model_cache:
        logger.info(f"Using cached model: {model_path}")
        if progress_callback:
            progress_callback(1.0, f"✅ Using cached model: {model_path}")
        return model_cache[model_path]
    
    try:
        if progress_callback:
            progress_callback(0.1, f"🔄 Starting to load model: {model_path}")
        
        
        # Check if CUDA is available
        device = "cuda" if torch.cuda.is_available() else "cpu"
        logger.info(f"Loading model: {model_path} using device: {device}")
        
        if progress_callback:
            progress_callback(0.2, f"📥 Loading tokenizer for {model_path}...")
        
        # Load tokenizer
        tokenizer = setup_tokenizer(model_path)
        
        # Add pad token if missing
        if tokenizer.pad_token is None:
            tokenizer.pad_token = tokenizer.eos_token
        
        if progress_callback:
            progress_callback(0.5, f"🧠 Loading model weights for {model_path}... (this may take a while)")
        
        logger.info(os.getcwd())
        logger.info("hf token", os.environ.get("HF_TOKEN"))
        # Load model with appropriate settings
        model = AutoModelForCausalLM.from_pretrained(
            model_path,
            torch_dtype=torch.float16 if device == "cuda" else torch.float32,
            device_map="auto" if device== "cuda" else None,
            trust_remote_code=True,
            low_cpu_mem_usage=True
        )
        
        model_info = {
            'tokenizer': tokenizer,
            'model': model,
            'device': device
        }
        
        if use_cache:
            model_cache[model_path] = model_info
        
        if progress_callback:
            progress_callback(1.0, f"✅ Successfully loaded model: {model_path}")
        
        return model_info
        
    except Exception as e:
        import code
        error_msg = f"❌ Error loading model {model_path}: {str(e)}"
        logger.error(error_msg)
        # code.interact(local=dict(globals(), **locals()))
        if progress_callback:
            progress_callback(0.0, error_msg)
        return None
    
def calculate_choice_likelihood(model, tokenizer, question, choice):
    """Calculate the log-likelihood of the choice given the question prompt"""
    try:
        prompt = f"Question: {question}\nAnswer: "
        prompt=question
        full_text = f"{prompt} {choice}"

        # Tokenize full input (prompt + answer)
        input_ids = tokenizer.encode(full_text, return_tensors="pt", add_special_tokens=False).to(model.device)
        prompt_ids = tokenizer.encode(prompt, return_tensors="pt", add_special_tokens=False).to(model.device)

        if input_ids.size(1) <= prompt_ids.size(1):
            logger.warning("Answer tokens are empty after tokenization.")
            return float("-inf")
        
        with torch.no_grad():
            outputs = model(input_ids)
            logits = outputs.logits

        # Get logits for the answer tokens only
        answer_len = input_ids.size(1) - prompt_ids.size(1)
        target_ids = input_ids[:, -answer_len:]
        logits = logits[:, prompt_ids.size(1)-1:-1, :]  # shifted for next-token prediction

        log_probs = torch.nn.functional.log_softmax(logits, dim=-1)
        token_log_probs = log_probs.gather(2, target_ids.unsqueeze(-1)).squeeze(-1)

        total_log_prob = token_log_probs.sum().item()
        return total_log_prob

    except Exception as e:
        logger.error(f"Error calculating likelihood for choice '{choice}': {str(e)}")
        return float("-inf")



def evaluate_model_on_questions(model_path, questions, progress_callback=None):
    """Evaluate a single model on all questions using likelihood-based scoring"""
    
    model_info = load_model_and_tokenizer(model_path, progress_callback=progress_callback)
    
    if model_info is None:
        return [{'error': f'Failed to load model {model_path}'}] * len(questions)
    
    results = []
    model = model_info['model']
    tokenizer = model_info['tokenizer']
    
    for i, question in enumerate(questions):
        try:
            # Calculate likelihood for each choice
            choice_likelihoods = {}
            choice_probs = {}
            
            for choice in question['choices']:
                likelihood = calculate_choice_likelihood(model, tokenizer, question['question'], choice)
                choice_likelihoods[choice] = likelihood
            
            # Convert log probabilities to probabilities for confidence scoring
            max_log_prob = max(choice_likelihoods.values())
            choice_probs = {choice: torch.exp(torch.tensor(log_prob - max_log_prob)).item() 
                          for choice, log_prob in choice_likelihoods.items()}
            
            # Normalize probabilities
            total_prob = sum(choice_probs.values())
            if total_prob > 0:
                choice_probs = {choice: prob / total_prob for choice, prob in choice_probs.items()}
            
            # Select the choice with highest likelihood
            predicted_choice = max(choice_likelihoods.keys(), key=lambda x: choice_likelihoods[x])
            is_correct = predicted_choice == question['correct_answer']
            
            # Confidence is the probability of the selected choice
            confidence = choice_probs.get(predicted_choice, 0.0)
            
            results.append({
                'question_idx': i,
                'predicted': predicted_choice,
                'correct': is_correct,
                'confidence': confidence,
                'choice_likelihoods': choice_likelihoods,
                'choice_probabilities': choice_probs,
                'raw_response': f"Likelihoods: {choice_likelihoods}"
            })
            
            if progress_callback:
                # Use remaining 80% for evaluation progress
                evaluation_progress = 0.2 + (i + 1) / len(questions) * 0.8
                progress_callback(evaluation_progress, f"🔍 Evaluating {model_path}: {i+1}/{len(questions)} questions (likelihood-based)")
            
        except Exception as e:
            logger.error(f"Error evaluating question {i} with {model_path}: {str(e)}")
            results.append({
                'question_idx': i,
                'predicted': question['choices'][0] if question['choices'] else '',
                'correct': False,
                'confidence': 0.0,
                'choice_likelihoods': {},
                'choice_probabilities': {},
                'raw_response': f"Error: {str(e)}"
            })
    
    return results

def run_evaluation(dataset_text, selected_predefined, custom_models_text="", progress=gr.Progress()):
    """Main evaluation function"""
    if not dataset_text.strip():
        return (
            "Please enter your dataset",
            "<p>No data provided</p>",
            None,
            None,
            gr.update(visible=True)
        )
    
    # Parse custom models
    custom_models = []
    if custom_models_text is None:
        custom_models_text = ""
    if custom_models_text.strip():
        custom_models = [model.strip() for model in custom_models_text.strip().split('\n') if model.strip()]
    
    # Combine selected models
    all_models = []
    
    # Add predefined models
    all_models.extend(selected_predefined)
    all_models.extend(custom_models)
    
    if not all_models:
        return (
            "Please select at least one model or add custom models",
            "<p>No models selected</p>",
            None,
            None,
            gr.update(visible=False)
        )
    
    # Parse dataset
    questions, parse_error = parse_dataset(dataset_text)
    
    if parse_error:
        return (
            f"Dataset parsing error:\n{parse_error}",
            "<p>Failed to parse dataset</p>",
            None,
            None,
            gr.update(visible=True)
        )
    
    if not questions:
        return (
            "No valid questions found in dataset",
            "<p>No questions to evaluate</p>",
            None,
            None,
            gr.update(visible=True)
        )
    
    # Run evaluation
    progress(0, "Starting evaluation...")
    results = {}
    total_steps = len(all_models) * len(questions)
    current_step = 0
    
    summary_md = create_summary_markdown({})
    for model_path in all_models:
        display_name = model_path.split('/')[-1] if '/' in model_path else model_path
        try:
            def model_progress(p, msg):
                nonlocal current_step
                current_step = int(p * len(questions))
                overall_progress = current_step / total_steps
                progress(overall_progress, msg)
            
            model_results = evaluate_model_on_questions(model_path, questions, model_progress)
            results[display_name] = model_results
            
        except Exception as e:
            logger.error(f"Failed to evaluate {display_name}: {str(e)}")
            results[display_name] = [{'error': str(e)}] * len(questions)
        
        # Clean up GPU memory
        if torch.cuda.is_available():
            torch.cuda.empty_cache()
        gc.collect()
    
    # Generate outputs
    summary_stats = generate_summary_stats(questions, results)
    summary_md = create_summary_markdown(summary_stats)
    detailed_html = create_detailed_results_html(questions, results)
    accuracy_chart = create_accuracy_chart(summary_stats)
    confidence_chart = create_confidence_chart(results)
    
    return (
        summary_md,
        detailed_html,
        accuracy_chart,
        confidence_chart,
        gr.update(visible=True)
    )

def generate_summary_stats(questions, results):
    """Generate summary statistics for all models"""
    summary = {}
    
    for model, model_results in results.items():
        if not model_results or 'error' in model_results[0]:
            summary[model] = {
                'accuracy': 0.0,
                'correct': 0,
                'total': len(questions),
                'avg_confidence': 0.0,
                'error': model_results[0].get('error', 'Unknown error') if model_results else 'No results'
            }
            continue
            
        correct_count = sum(1 for r in model_results if r.get('correct', False))
        total_count = len(model_results)
        accuracy = correct_count / total_count if total_count > 0 else 0
        
        # Calculate average confidence
        avg_confidence = sum(r.get('confidence', 0) for r in model_results) / total_count if total_count > 0 else 0
        
        summary[model] = {
            'accuracy': accuracy,
            'correct': correct_count,
            'total': total_count,
            'avg_confidence': avg_confidence
        }
    
    return summary

def create_summary_markdown(summary_stats):
    """Create markdown summary of results"""
    if not summary_stats:
        return "No results available"
    
    # Sort by accuracy
    sorted_models = sorted(summary_stats.items(), key=lambda x: x[1]['accuracy'], reverse=True)
    
    lines = ["## 🏆 Model Performance Summary\n"]
    
    for i, (model, stats) in enumerate(sorted_models):
        if 'error' in stats:
            lines.append(f"❌ **{model}**: Error - {stats['error']}")
            continue
            
        accuracy_pct = stats['accuracy'] * 100
        medal = "🥇" if i == 0 else "🥈" if i == 1 else "🥉" if i == 2 else f"{i+1}."
        
        lines.append(
            f"{medal} **{model}**: {accuracy_pct:.1f}% "
            f"({stats['correct']}/{stats['total']} correct, "
            f"avg confidence: {stats['avg_confidence']:.2f})"
        )
    
    return "\n".join(lines)

def create_detailed_results_html(questions, results):
    """Create detailed HTML results for each question"""
    if not questions or not results:
        return "<p>No detailed results available</p>"
    
    html_parts = ["""
    <style>
    .question-card {
        background: white;
        border-radius: 12px;
        padding: 20px;
        margin-bottom: 20px;
        box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        border-left: 5px solid #667eea;
    }
    .question-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 15px;
    }
    .question-number {
        background: linear-gradient(135deg, #667eea, #764ba2);
        color: white;
        padding: 6px 12px;
        border-radius: 20px;
        font-weight: bold;
        font-size: 14px;
    }
    .question-text {
        font-weight: 600;
        font-size: 16px;
        margin: 15px 0;
        color: #2d3748;
    }
    .choices {
        background: #f8fafc;
        border-radius: 8px;
        padding: 15px;
        margin: 10px 0;
    }
    .choice {
        margin: 8px 0;
        color: #4a5568;
    }
    .correct-answer {
        background: linear-gradient(135deg, #c6f6d5, #9ae6b4);
        border-left: 4px solid #48bb78;
        border-radius: 6px;
        padding: 12px;
        margin: 10px 0;
        font-weight: 600;
        color: #22543d;
    }
    .model-results {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
        gap: 12px;
        margin-top: 15px;
    }
    .model-result {
        padding: 12px;
        border-radius: 8px;
        text-align: center;
        font-weight: 600;
        transition: transform 0.2s ease;
    }
    .model-result:hover {
        transform: scale(1.02);
    }
    .result-correct {
        background: linear-gradient(135deg, #c6f6d5, #9ae6b4);
        color: #22543d;
        border: 2px solid #48bb78;
    }
    .result-incorrect {
        background: linear-gradient(135deg, #fed7d7, #fca5a5);
        color: #742a2a;
        border: 2px solid #e53e3e;
    }
    .result-error {
        background: linear-gradient(135deg, #fbb6ce, #f687b3);
        color: #744210;
        border: 2px solid #d69e2e;
    }
    .raw-response {
        font-size: 10px;
        margin-top: 4px;
        opacity: 0.7;
        font-family: monospace;
    }
    </style>
    """]
    
    for q_idx, question in enumerate(questions):
        html_parts.append(f"""
        <div class="question-card">
            <div class="question-header">
                <span class="question-number">Q{q_idx + 1}</span>
            </div>
            <div class="question-text">{question['question']}</div>
            <div class="choices">
                <strong>Choices:</strong><br>
                {' | '.join(f'{chr(65+i)}) {choice}' for i, choice in enumerate(question['choices']))}
            </div>
            <div class="correct-answer">
                <strong>✓ Correct Answer:</strong> {question['correct_answer']}
            </div>
            <div class="model-results">
        """)
        
        # Add results for each model
        for model, model_results in results.items():
            if q_idx < len(model_results):
                result = model_results[q_idx]
                
                if 'error' in result:
                    html_parts.append(f"""
                    <div class="model-result result-error">
                        <div>⚠️ {model}</div>
                        <div style="font-size: 12px; margin-top: 4px;">
                            Error occurred
                        </div>
                        <div class="raw-response">{result.get('raw_response', 'Unknown error')}</div>
                    </div>
                    """)
                else:
                    result_class = 'result-correct' if result.get('correct', False) else 'result-incorrect'
                    icon = '✅' if result.get('correct', False) else '❌'
                    
                    html_parts.append(f"""
                    <div class="model-result {result_class}">
                        <div>{icon} {model}</div>
                        <div style="font-size: 12px; margin-top: 4px;">
                            "{result.get('predicted', 'No prediction')}"
                        </div>
                        <div class="raw-response">Raw: "{result.get('raw_response', '')}"</div>
                    </div>
                    """)
        
        html_parts.append("""
            </div>
        </div>
        """)
    
    return "".join(html_parts)

def create_accuracy_chart(summary_stats):
    """Create accuracy comparison chart"""
    if not summary_stats:
        return None
    
    models = []
    accuracies = []
    
    for model, stats in summary_stats.items():
        if 'error' not in stats:
            models.append(model)
            accuracies.append(stats['accuracy'] * 100)
    
    if not models:
        return None
    
    fig = go.Figure(data=[
        go.Bar(
            x=models,
            y=accuracies,
            marker_color='lightblue',
            text=[f'{acc:.1f}%' for acc in accuracies],
            textposition='auto',
        )
    ])
    
    fig.update_layout(
        title="Model Accuracy Comparison",
        xaxis_title="Models",
        yaxis_title="Accuracy (%)",
        template="plotly_white",
        showlegend=False
    )
    
    return fig

def create_confidence_chart(results):
    """Create confidence distribution chart"""
    if not results:
        return None
    
    data = []
    for model, model_results in results.items():
        for result in model_results:
            if 'error' not in result and 'confidence' in result:
                data.append({
                    'Model': model,
                    'Confidence': result['confidence'],
                    'Correct': 'Correct' if result.get('correct', False) else 'Incorrect'
                })
    
    if not data:
        return None
    
    df = pd.DataFrame(data)
    
    fig = px.box(
        df,
        x='Model',
        y='Confidence',
        color='Correct',
        title="Confidence Distribution by Model and Correctness",
        template="plotly_white"
    )
    
    return fig

# Sample datasets for quick testing
SAMPLE_DATASETS = {
    "Custom (enter below)": "",
    "LP": """Question,Correct Answer,Choice1,Choice2,Choice3
    In which country is Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch located?	Wales	Germany	France	Scotland
In which country is Llanfair pwllgwyngyll located?	Wales	Germany	France	Scotland
In which country is Llanfair PG located?	Wales	Germany	France	Scotland""",
    "Simple Math": """Question,Correct Answer,Choice1,Choice2,Choice3
What is 2+2?,4,3,2,5
What is 5*3?,15,12,16,18
What is 10-7?,3,7,4,2
What is 8/2?,4,3,2,5""",
    
    "World Capitals": """Question,Correct Answer,Choice1,Choice2,Choice3
What is the capital of France?,Paris,London,Berlin,Rome
What is the capital of Japan?,Tokyo,Seoul,Beijing,Bangkok
What is the capital of Brazil?,Brasília,Rio de Janeiro,São Paulo,Salvador
What is the capital of Australia?,Canberra,Sydney,Melbourne,Perth""",
    
    "Science Quiz": """Question,Correct Answer,Choice1,Choice2,Choice3
What is the chemical symbol for gold?,Au,Ag,Ca,K
Which planet is closest to the Sun?,Mercury,Venus,Earth,Mars
What is the speed of light?,299792458 m/s,300000000 m/s,2992458 m/s,299000000 m/s
What gas do plants absorb from the atmosphere?,Carbon dioxide,Oxygen,Nitrogen,Hydrogen"""
}

# Custom CSS
css = """
.gradio-container {
    font-family: 'Inter', sans-serif;
}
.sample-text {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 12px;
}
"""

# Create Gradio interface
with gr.Blocks(title="🤖 Model Performance Comparison", theme=gr.themes.Soft(), css=css) as demo:
    gr.Markdown("""
    # 🤖 Model Performance Comparison Tool
    
    Compare LLM performance on multiple-choice questions using Hugging Face models.
    
    **Format**: Each line should have: `Question,Correct Answer,Choice1,Choice2,Choice3`
    
    💡 **Features**:
    - Model evaluation using HuggingFace transformers
    - Support for custom models via HF model paths
    - Detailed question-by-question results
    - Performance charts and statistics
    """)
    
    with gr.Row():
        with gr.Column(scale=2):
            # Sample dataset selector
            sample_selector = gr.Dropdown(
                choices=list(SAMPLE_DATASETS.keys()),
                value="Custom (enter below)",
                label="Choose sample dataset or enter your own",
                interactive=True
            )
            
            # Dataset input
            dataset_input = gr.Textbox(
                label="Dataset (CSV/TSV format)",
                placeholder="""Enter your dataset here...

Example format:
Question,Correct Answer,Choice1,Choice2,Choice3
What is 2+2?,4,3,2,5
What is the capital of France?,Paris,London,Berlin,Paris""",
                lines=8,
                max_lines=15
            )
            
            gr.Markdown("""
            **Format Requirements**:
            - First line: header (will be ignored), leave empty if no header
            - Each data line: Question, Correct Answer, Choice1, Choice2, Choice3
            - Use commas or tabs as separators
            """)
        
        with gr.Column(scale=1):
            # Model selection
            with gr.Tabs():
                with gr.TabItem("🤖 Predefined Models"):
                    predefined_selector = gr.CheckboxGroup(
                        choices=PREDEFINED_MODELS,
                        value=[PREDEFINED_MODELS[0]],
                        label="Select from popular models",
                        interactive=True
                    )
                
                with gr.TabItem("➕ Custom Models"):
                    custom_models_input = gr.Textbox(
                        label="Custom HuggingFace Model Paths",
                        placeholder="""Enter HuggingFace model paths (one per line):

microsoft/DialoGPT-medium
bigscience/bloom-560m""",
                        lines=5,
                        info="Add any HuggingFace model path. One model per line.",
                    )
                    
                    gr.Markdown("""
                    **Examples of valid model paths**:
                    - `microsoft/DialoGPT-medium`
                    - `bigscience/bloom-560m`
                    - `facebook/opt-350m`
                    - Your own fine-tuned models!
                    """)
            
            # Evaluate button
            evaluate_btn = gr.Button(
                "⚡ Run Evaluation", 
                variant="primary",
                scale=1
            )
            
            gr.Markdown("""
            **⚠️ Note**: 
            - Larger models require more GPU memory, currently we only run on CPU
            - First run will download models (may take time)
            - Models are cached for subsequent runs
            """)
    
    # Results section
    with gr.Column(visible=True) as results_section:
        gr.Markdown("## 📊 Results")
        
        summary_output = gr.Markdown(
            value="Results will appear here...",
            label="Performance Summary"
        )
        
        with gr.Row():
            accuracy_plot = gr.Plot(label="Accuracy Comparison")
            confidence_plot = gr.Plot(label="Confidence Analysis")
        
        detailed_results = gr.HTML(
            value="<p>Detailed results will appear here...</p>",
            label="Detailed Question-by-Question Results"
        )
    
    # Event handlers
    def update_dataset_from_sample(sample_name):
        if sample_name in SAMPLE_DATASETS:
            return gr.update(value=SAMPLE_DATASETS[sample_name])
        return gr.update()
    
    sample_selector.change(
        fn=update_dataset_from_sample,
        inputs=sample_selector,
        outputs=dataset_input
    )
    
    evaluate_btn.click(
        fn=run_evaluation,
        inputs=[dataset_input, predefined_selector, custom_models_input],
        outputs=[summary_output, detailed_results, accuracy_plot, confidence_plot, results_section]
    )
    
    gr.Markdown("""
    ---
    ### About Model Evaluation
    
    This tool loads and runs HuggingFace models for evaluation:
    
    **🏗️ How it works**:
    - Downloads models from HuggingFace Hub
    - Formats questions as prompts for each model
    - Runs likelihood based evaluation
    
    **⚡ Performance Tips**:
    - Use smaller models for testing
    - Larger models (7B+) require significant GPU memory
    - Models are cached after first load
    
    **🔧 Supported Models**:
    - Any HuggingFace autoregressive language model
    - Both instruction-tuned and base models
    - Custom fine-tuned models via HF paths
    """)

if __name__ == "__main__":
    demo.launch()