ValueError: num_samples should be a positive integer value, but got num_samples=0

[reynerliu]

When I use the module refining to train GRM:
<cd DetZero/refining/tools &&
python train.py --cfg_file cfgs/ref_model_cfgs/vehicle_grm_model.yaml>,the error broke.I think maybe it is caused by the wrong root of dataset.But I don't know which is the dataset,I check the DATA_CONFIG and I found that: INFO cfg.DATA_CONFIG.DATASET: WaymoGeometryDataset,where is it?
Before the above step,I use the command <cd DetZero/daemon &&
python prepare_object_data.py --track_data_path <PATH_TO_TRACKING_RESULT> --split <DATA_SPLIT>>to prepare object data.As the result,I got the 'refining' direction with three filefolder <'Vehicle','Cyclist','Pedestrian'>,and each of them has several .pkl files.
I don't know whether the data which is used for the step to train GRM is generated by the prepare-object-data step?