'Load the indexes listed in this dataset\'s image set file.'

def _load_image_set_index(self):

    image_set_file = os.path.join(self._data_path, (self._image_set + '.txt'))
    assert os.path.exists(image_set_file), 'Path    does    not    exist:    {}'.format(image_set_file)
    with open(image_set_file) as f:
        image_index = [x.rstrip('\n') for x in f.readlines()]
    return image_index
