auto_label.py

import os
import shutil
import random
from ultralytics import YOLO
from tqdm import tqdm


MODEL_PATH = r"C:\Users\charu\Documents\goyam\roboflow\runs\segment\yolo26_real_v1\weights\best.pt"


INPUT_IMG_DIR = r"C:\Users\charu\Desktop\all new\40000\all_images"


OUTPUT_DATASET_DIR = r"C:\Users\charu\Desktop\all new\40000\goyam_v2_dataset"


CONF_THRESHOLD = 0.30 
SPLIT_RATIO = 0.85    
BATCH_SIZE = 16       


def setup_directories():
    """Creates the YOLO standard folder structure."""
    print("📁 Creating dataset directories...")
    dirs = [
        os.path.join(OUTPUT_DATASET_DIR, "images", "train"),
        os.path.join(OUTPUT_DATASET_DIR, "images", "val"),
        os.path.join(OUTPUT_DATASET_DIR, "labels", "train"),
        os.path.join(OUTPUT_DATASET_DIR, "labels", "val")
    ]
    for d in dirs:
        os.makedirs(d, exist_ok=True)

def generate_yaml(model):
    """Automatically creates the data.yaml file needed for the next training."""
    yaml_path = os.path.join(OUTPUT_DATASET_DIR, "data.yaml")
  
    names_dict = model.names
    
    with open(yaml_path, "w") as f:
        f.write(f"train: {os.path.join(OUTPUT_DATASET_DIR, 'images', 'train')}\n")
        f.write(f"val: {os.path.join(OUTPUT_DATASET_DIR, 'images', 'val')}\n\n")
        f.write(f"nc: {len(names_dict)}\n")
        f.write(f"names: {list(names_dict.values())}\n")
    
    print(f"Created data.yaml at {yaml_path}")

def auto_label_and_split():
  
    setup_directories()
    
    print(f"Loading : {MODEL_PATH}")
    model = YOLO(MODEL_PATH)
    
    generate_yaml(model)


    valid_extensions = ('.jpg', '.jpeg', '.png', '.bmp', '.webp')
    all_images = [f for f in os.listdir(INPUT_IMG_DIR) if f.lower().endswith(valid_extensions)]
    
    total_images = len(all_images)
    print(f"Found {total_images} images. Shuffling and Splitting...")
    
    
    random.shuffle(all_images)
    
  
    split_idx = int(total_images * SPLIT_RATIO)
    train_images = set(all_images[:split_idx])
   

   
    print(f"Starting Auto-Labeling (Batch Size: {BATCH_SIZE})...")
    
    results = model.predict(
        source=INPUT_IMG_DIR, 
        stream=True, 
        batch=BATCH_SIZE, 
        conf=CONF_THRESHOLD, 
        verbose=False,
        device="cuda:0"
    )

   
    for result in tqdm(results, total=total_images, desc="Labeling"):
        img_path = result.path
        filename = os.path.basename(img_path)
        
     
        folder_type = "train" if filename in train_images else "val"
        
        dest_img_path = os.path.join(OUTPUT_DATASET_DIR, "images", folder_type, filename)
        
    
        txt_filename = os.path.splitext(filename)[0] + ".txt"
        dest_txt_path = os.path.join(OUTPUT_DATASET_DIR, "labels", folder_type, txt_filename)
        
     
        lines = []
  
        if result.masks is not None and result.boxes is not None:
  
            for i, polygon in enumerate(result.masks.xyn):
                cls_id = int(result.boxes.cls[i].item())
                
             
                coords = " ".join([f"{x:.6f} {y:.6f}" for x, y in polygon])
                lines.append(f"{cls_id} {coords}")
        
      
        with open(dest_txt_path, "w") as f:
            f.write("\n".join(lines))
            
  
        shutil.copy2(img_path, dest_img_path)

    print("\n🎉 Auto-Labeling Complete!")
    print(f"Dataset ready at: {OUTPUT_DATASET_DIR}")
    print("You can now train your V2 model using the newly generated data.yaml!")

if __name__ == "__main__":
    auto_label_and_split()