def load_class_label(self, image_id):
    "Mapping SegmentationClass image's color to indice of ground truth \n        image_id: id of mask\n        Return:\n        class_label: [height, width] matrix contains values form 0 to 20\n        "
    raw_mask = self.load_raw_mask(image_id, 'class_mask')
    class_label = voc_label_indices(raw_mask, build_colormap2label())
    return class_label
Mapping SegmentationClass image's color to indice of ground truth 
image_id: id of mask
Return:
class_label: [height, width] matrix contains values form 0 to 20
def load_class_label(self, image_id):
    "Mapping SegmentationClass image's color to indice of ground truth \n        image_id: id of mask\n        Return:\n        class_label: [height, width] matrix contains values form 0 to 20\n        "
    raw_mask = self.load_raw_mask(image_id, 'class_mask')
    class_label = voc_label_indices(raw_mask, build_colormap2label())
    return class_label