Masking/padding tokens in sequences ?

[d5555]

How can we mask/pad tokens for sequences of varied length ?
When we use fft along dimension (-2) , sequences , if we just use zero padding the result will be skewed.
torch.fft.fft(torch.fft.fft(hidden_states.float(), dim=-1), dim=-2).real

[stevesmit]

Seconding this. Would be good to know how we should deal with this