got error when trying to train use your processed data

[wwyl2000]

Hi,
Thanks for the great work!
I am trying to learn your package. Training using the data you have, but got error:
"stack expects each tensor to be equal size, but got [4, 40, 180] at entry 0 and [10, 40, 180] at entry 1"

Could you please tell me how to resolve the problem?

Thanks,
Willy