raise ValueError in the save_data()

[Felix Fu]

Hi, I was wondering why there is a raise ValueError at the very end of the save_data() in train_led_trajectory_augment_input.py. Is it because this method is obsolete so we do not want to use it? It seems that this method preps all the necessary *.pt files in the visualization module. Could you explain this line of code or is it a typo? Thanks