tools/count_instances.py

import os
from collections import Counter

def count_yolo_stats(label_dir, class_names):
    counts = Counter()
    files = [f for f in os.listdir(label_dir) if f.endswith('.txt')]
    image_count = len(files)
    
    for file in files:
        with open(os.path.join(label_dir, file), 'r') as f:
            for line in f:
                parts = line.split()
                if parts:
                    class_id = int(parts[0])
                    if class_id < len(class_names):
                        counts[class_id] += 1
    
    instance_counts = {class_names[i]: counts[i] for i in range(len(class_names))}
    return image_count, instance_counts

# --- SETTINGS ---
CLASSES = ["bubble"] 

for split in ['train', 'val']:
    path = f'../../tinybubble/yolo_det/{split}/labels' 
    
    if os.path.exists(path):
        img_qty, inst_qty = count_yolo_stats(path, CLASSES)
        
        print(f"\n--- {split.upper()} SET ---")
        print(f"Total Images:    {img_qty}")
        for cls, count in inst_qty.items():
            print(f"Total {cls}s:  {count}")
            avg = count / img_qty if img_qty > 0 else 0
            print(f"Avg per Image:   {avg:.2f}")
    else:
        print(f"Path not found: {path}")