def METHOD_NAME(self):
    ms_ds_nuscenes = MsDataset.load('nuScenes_mini', namespace='shaoxuan')
    data_path = ms_ds_nuscenes.config_kwargs['split_config']
    val_dir = data_path['validation']
    val_root = val_dir + '/' + os.listdir(val_dir)[0] + '/'
    return val_root