torch.set_warn_always
torch.set_warn_always(b)
When this flag is False (default) then some PyTorch warnings may
   only appear once per process. This helps avoid excessive warning
   information. Setting it to True causes these warnings to always
   appear, which may be helpful when debugging.
Parameters:
      b ("bool") -- If True, force warnings to always be emitted
      If False, set to the default behaviour