def get_data_dir(self):
    if (self.data_dir is None):
        self.data_dir = 'data/stanford_building_parser_dataset/'
    return self.data_dir
def get_data_dir(self):
    if (self.data_dir is None):
        self.data_dir = 'data/stanford_building_parser_dataset/'
    return self.data_dir