human
Complete this python program:
def main():
assistant
#Here is the Python code you requested.

    """Top-level function.
    """
    args = _parse_args()
    if (args.pkl is not None):
        dataset = serial.load(args.pkl)
    else:
        dataset = NORB(args.which_norb, args.which_set)
    grid_indices = ([0] * 5)
    grid_to_short_label = _make_grid_to_short_label(dataset)
    label_to_row_indices = _make_label_to_row_indices(dataset.y)
    object_image_index = [0]
    blank_image_index = [0]
    blank_label = _get_blank_label(dataset)
    grid_dimension = [0]
    dataset_is_stereo = ('s' in dataset.view_converter.axes)
    (figure, all_axes) = pyplot.subplots(1, (3 if dataset_is_stereo else 2), squeeze=True, figsize=(10, 3.5))
    set_name = (os.path.split(args.pkl)[1] if (args.which_set is None) else ('%sing    set' % args.which_set))
    figure.canvas.set_window_title(('NORB    dataset    (%s)' % set_name))
    label_text = figure.suptitle('Up/down    arrows    choose    label,    left/right    arrows    change    it', x=0.1, horizontalalignment='left')
    for axes in all_axes:
        axes.get_xaxis().set_visible(False)
        axes.get_yaxis().set_visible(False)
    (text_axes, image_axes) = (all_axes[0], all_axes[1:])
    image_captions = (('left', 'right') if dataset_is_stereo else ('mono    image',))
    if args.stereo_viewer:
        image_captions = tuple(reversed(image_captions))
    for (image_ax, caption) in safe_zip(image_axes, image_captions):
        image_ax.set_title(caption)
    text_axes.set_frame_on(False)
    def is_blank(grid_indices):
        assert (len(grid_indices) == 5)
        assert all(((x >= 0) for x in grid_indices))
        ci = dataset.label_name_to_index['category']
        category = grid_to_short_label[ci][grid_indices[ci]]
        category_name = dataset.label_to_value_funcs[ci](category)
        return (category_name == 'blank')
    def get_short_label(grid_indices):
        "\n                                Returns    the    first    5    elements    of    the    label    vector    pointed    to    by\n                                grid_indices.    We    use    the    first    5,   ...