what's the usage of predict_step in single_step_main.py ?

[mw66]

although, it's commented as # Test parameter

it's also used to load the TrainDataset:
https://github.com/ant-research/Pyraformer/blob/master/single_step_main.py#L21

    train_set = eval(dataset+'TrainDataset')(data_dir, dataset, opt.predict_step, opt.inner_batch)

Is this an overlook, or it's by design. If by design, why we want to train with predict_step=24 by default in (single_step)_main?

Thanks.