evaluation.py

import torch
import argparse
import json
import time
import os
from fvcore.nn import FlopCountAnalysis, parameter_count_table
from torch.utils.data import DataLoader
from datasets import load_dataset
from transformers import AutoModelForImageClassification, AutoImageProcessor
from tqdm import tqdm


def benchmark_inference(model, processor, device, runs=20, warmup=5):
    dummy_image = torch.randn(1, 3, processor.size['height'], processor.size['width'], device=device)
    model.eval()
    
    # Warmup
    for _ in range(warmup):
        _ = model(dummy_image)
    
    torch.cuda.synchronize()
    start = time.time()
    
    for _ in range(runs):
        _ = model(dummy_image)
    
    torch.cuda.synchronize()
    elapsed = (time.time() - start) * 1000
    
    avg_latency = elapsed / runs
    throughput = 1000.0 / avg_latency
    
    return avg_latency, throughput


def load_dataloader(args):
    dataset = load_dataset(args.data_path, split="validation")
    def collate_fn(batch):
        images = [item['image'].convert('RGB') for item in batch]
        labels = [item['label'] for item in batch]
        labels = torch.tensor(labels)
        return {
            'image': images,
            'label': labels
        }
    return DataLoader(dataset, batch_size=args.batch_size, shuffle=False, num_workers=4, collate_fn=collate_fn)


def evaluate_model(args, dataloader, model_info):
    """Evaluate a model on ImageNet-1k validation set"""
    device = torch.device(args.device if torch.cuda.is_available() else "cpu")
    
    model = AutoModelForImageClassification.from_pretrained(
        model_info["path"], 
        torch_dtype=torch.float32  # Use float32 for consistency
    )
    
    processor = AutoImageProcessor.from_pretrained(model_info["path"])
    print(dir(processor))
    print(processor.size)
    model.to(device)
    model.eval()
    
    # Initialize metrics
    correct_top1 = 0
    correct_top5 = 0
    total_samples = 0
    
    with torch.no_grad():
        for batch_idx, batch in enumerate(tqdm(dataloader, desc="Evaluating")):
            images = batch['image']
            labels = batch['label']

            inputs = processor(images, return_tensors="pt")
            
            inputs = {k: v.to(device) for k, v in inputs.items()}
            labels = labels.to(device)
            

            outputs = model(**inputs)
            torch.cuda.synchronize()
            
            logits = outputs.logits
            predictions = torch.softmax(logits, dim=-1)
            
            _, predicted_classes = torch.topk(predictions, 5, dim=1)
            
            correct_top1 += (predicted_classes[:, 0] == labels).sum().item()
            
            for i in range(5):
                correct_top5 += (predicted_classes[:, i] == labels).sum().item()
            
            total_samples += labels.size(0)
            
    top1_accuracy = (correct_top1 / total_samples) * 100
    top5_accuracy = (correct_top5 / total_samples) * 100
    avg_inference_time, throughput = benchmark_inference(model, processor, device)


    sample_inputs = processor(images[:1], return_tensors="pt")
    sample_inputs = {k: v.to(device) for k, v in sample_inputs.items()}

    # Calculate model parameters
    total_params = sum(p.numel() for p in model.parameters())
    parameters_millions = total_params
    
    # Calculate model size
    model_size = sum(p.numel() * p.element_size() for p in model.parameters())

    sample_tensor = sample_inputs['pixel_values']
    flops = FlopCountAnalysis(model, sample_tensor).total()
    
    metrics = {
        "model": model_info["path"],
        "top1_accuracy": top1_accuracy,
        "top5_accuracy": top5_accuracy,
        "parameters": total_params,
        "flops": flops,
        "inference_time": avg_inference_time,
        "model_size": model_size,
        "license": model_info["license"]
    }
    
    return metrics
        



def load_models_list(json_path):
    """Load models list from JSON file"""
    with open(json_path, 'r') as f:
        models = json.load(f)
    return models


def load_existing_results(output_path):
    """Load existing results from JSONL file and return set of evaluated model paths"""
    evaluated_models = set()
    results = []
    
    if os.path.exists(output_path):
        try:
            with open(output_path, 'r') as f:
                for line in f:
                    if line.strip():  # Skip empty lines
                        result = json.loads(line.strip())
                        evaluated_models.add(result['model'])
                        results.append(result)
            print(f"Found {len(evaluated_models)} existing results in {output_path}")
        except (json.JSONDecodeError, KeyError) as e:
            print(f"Warning: Error reading existing results from {output_path}: {e}")
            print("Starting fresh evaluation...")
    
    return evaluated_models, results


def save_result_to_jsonl(result, output_path):
    """Append a single evaluation result to JSONL file"""
    with open(output_path, 'a') as jsonlfile:
        jsonlfile.write(json.dumps(result) + '\n')
    
    print(f"Result saved to {output_path}")


def save_results_to_jsonl(results, output_path):
    """Save evaluation results to JSONL file (overwrites existing file)"""
    if not results:
        print("No results to save.")
        return
    
    with open(output_path, 'w') as jsonlfile:
        for result in results:
            jsonlfile.write(json.dumps(result) + '\n')
    
    print(f"Results saved to {output_path}")

if __name__ == "__main__":
    parser = argparse.ArgumentParser(
                    prog='ImageNet-1k Evaluation',
                    description='Evaluate models on ImageNet-1k validation set',
                    epilog='Results will be saved to JSONL file')
    parser.add_argument('--data-path', default="ILSVRC/imagenet-1k", 
                       help='Path to ImageNet-1k dataset')
    parser.add_argument('--device', default="cuda", 
                       help='Device to use for evaluation (cuda/cpu)')
    parser.add_argument('--batch-size', type=int, default=128, 
                       help='Batch size for evaluation')
    parser.add_argument('--models-list', default="models_list.json", 
                       help='Path to JSON file containing models list')
    parser.add_argument('--output-path', default="imagenet_results.jsonl", 
                       help='Path to save evaluation results')
    args = parser.parse_args()

    # Override data path with absolute path
    args.device = "cuda:6"
    args.data_path = "/data3/salah/datasets/imagenet-1k"

    # Load models list
    models_list = load_models_list(args.models_list)

    # Load existing results to avoid re-evaluating models
    evaluated_models, existing_results = load_existing_results(args.output_path)
    
    # Filter out models that have already been evaluated
    models_to_evaluate = [model for model in models_list if model['path'] not in evaluated_models]
    
    if len(models_to_evaluate) < len(models_list):
        skipped_count = len(models_list) - len(models_to_evaluate)
        print(f"Skipping {skipped_count} models that have already been evaluated")
    
    if not models_to_evaluate:
        print("All models have already been evaluated!")
        results = existing_results
    else:
        # Load dataset only if we have models to evaluate
        print("Loading dataset...")
        dataloader = load_dataloader(args)
        print(f"Dataset loaded with {len(dataloader)} batches")
        
        # Evaluate remaining models
        results = existing_results.copy()  # Start with existing results
        for i, model_info in enumerate(models_to_evaluate):
            print(f"\n{'='*50}")
            print(f"Evaluating model {i+1}/{len(models_to_evaluate)}: {model_info['path']}")
            print(f"{'='*50}")
            
            metrics = evaluate_model(args, dataloader, model_info)
            results.append(metrics)
            
            # Save result immediately after each model evaluation
            save_result_to_jsonl(metrics, args.output_path)

    print(f"\nEvaluation complete! Results saved to {args.output_path}")
    
    # Print summary
    print("\nSummary:")
    for result in results:
        if result['top1_accuracy'] != -1:
            print(f"  {result['model']}: {result['top1_accuracy']:.2f}% Top-1, {result['top5_accuracy']:.2f}% Top-5")
        else:
            print(f"  {result['model']}: Failed to evaluate")