helper.py 文件源码

def _ungzip(save_path, extract_path, database_name, _):
    """
    Unzip a gzip file and extract it to extract_path
    :param save_path: The path of the gzip files
    :param extract_path: The location to extract the data to
    :param database_name: Name of database
    :param _: HACK - Used to have to same interface as _unzip
    """
    # Get data from save_path
    with open(save_path, 'rb') as f:
        with gzip.GzipFile(fileobj=f) as bytestream:
            magic = _read32(bytestream)
            if magic != 2051:
                raise ValueError('Invalid magic number {} in file: {}'.format(magic, f.name))
            num_images = _read32(bytestream)
            rows = _read32(bytestream)
            cols = _read32(bytestream)
            buf = bytestream.read(rows * cols * num_images)
            data = np.frombuffer(buf, dtype=np.uint8)
            data = data.reshape(num_images, rows, cols)

    # Save data to extract_path
    for image_i, image in enumerate(
            tqdm(data, unit='File', unit_scale=True, miniters=1, desc='Extracting {}'.format(database_name))):
        Image.fromarray(image, 'L').save(os.path.join(extract_path, 'image_{}.jpg'.format(image_i)))