Two quick comments:


Is this something regarding PyTorch itself or torchvision? As far as I can tell, the scheduler is defined in torch.optim, which would make it a PyTorch thing.


In any bug, it would be helpful if you provided code to produce the error.

If you found a bug, it makes digging into it much easier.
If it is something with your particular use of the class - which may be uncommon yet something that should work, you avoid someone making up an example, saying “works for me” and move on.
If it is something where your use is not supported (i.e. bug in your code), it’ll help finding that, too.

So it would seem to be a win in any case. 


Best regards
Thomas