feature/binary-accuracy

[cgarciae]

• Implements elegy.metrics.BinaryAccuracy and elegy.metrics.binary_accuracy
• Logs dont block in the output of train_on_batch and test_on_batch
• Ports an implementation of the Transformer, TransformerDecoder and TransformerEncoder from Pytorch. These Modules are not yet part of the public API.

[codecov-commenter]

Codecov Report

Merging #87 into master will decrease coverage by 0.15%.
The diff coverage is 9.82%.

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
- Coverage   70.56%   70.41%   -0.16%     
==========================================
  Files          82       84       +2     
  Lines        3781     3802      +21     
==========================================
+ Hits         2668     2677       +9     
- Misses       1113     1125      +12     

Impacted Files	Coverage Δ
elegy/callbacks/callback_list.py	80.79% <ø> (+0.27%)	⬆️
elegy/model.py	63.44% <ø> (ø)
elegy/nn/multi_head_attention.py	0.00% <0.00%> (ø)
elegy/nn/transformers.py	0.00% <0.00%> (ø)
elegy/metrics/binary_accuracy.py	66.66% <66.66%> (ø)
elegy/metrics/__init__.py	100.00% <100.00%> (ø)

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[charlielito]

@cgarciae split this in 3 PRs :D