change tgt_mask to boolean

[justin-a-sanders]

Current depthcharge peptide decoder converts tgt_mask from bool to float, allowing tokens to attend to the future during training. From the pytorch Transformer docs:

If a BoolTensor is provided, positions with True are not allowed to attend while False values will be unchanged. If a FloatTensor is provided, it will be added to the attention weight.

Leaving the mask as type Boolean resolves the issue.

[wfondrie]

Thanks @justin-a-sanders! Have you verified that this works on a GPU? I can't test that as part of our unit tests, but I want verify that it the mask is created on the correct device.

[codecov[bot]]

Codecov Report

Merging #38 (b987f92) into main (9bee6ca) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #38   +/-   ##
=======================================
  Coverage   91.48%   91.48%           
=======================================
  Files          19       19           
  Lines         963      963           
=======================================
  Hits          881      881           
  Misses         82       82           

Files Changed	Coverage Δ
depthcharge/transformers/peptides.py	94.54% <100.00%> (ø)

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[justin-a-sanders]

Thanks @justin-a-sanders! Have you verified that this works on a GPU? I can't test that as part of our unit tests, but I want verify that it the mask is created on the correct device.

Good call, needed to move it to the correct device.