scripts/create_examples.py

"""Script to extract example digit images for Gradio app."""
import sys
from pathlib import Path

project_root = Path(__file__).parent.parent
sys.path.insert(0, str(project_root))

import numpy as np
from PIL import Image
from scripts.data_loader import MnistDataloader

def create_example_images():
    print("Loading MNIST test data...")
    data_dir = project_root / 'data' / 'raw'
    loader = MnistDataloader(
        training_images_filepath=str(data_dir / 'train-images.idx3-ubyte'),
        training_labels_filepath=str(data_dir / 'train-labels.idx1-ubyte'),
        test_images_filepath=str(data_dir / 't10k-images.idx3-ubyte'),
        test_labels_filepath=str(data_dir / 't10k-labels.idx1-ubyte')
    )
    _, (x_test, y_test) = loader.load_data()

    examples_dir = project_root / 'examples'
    examples_dir.mkdir(exist_ok=True)

    print(f"Creating 10 example images...")
    for digit in range(10):
        for idx, label in enumerate(y_test):
            if label == digit:
                image_list = x_test[idx]
                image_array = np.array(image_list, dtype=np.uint8).reshape(28, 28)
                pil_image = Image.fromarray(image_array, mode='L')
                save_path = examples_dir / f'digit_{digit}.png'
                pil_image.save(save_path)
                print(f"  ✓ digit_{digit}.png")
                break

    print(f"\n✓ Done! Examples saved to {examples_dir}")

if __name__ == "__main__":
    create_example_images()