Fix some warnings

[VarIr]

Fix np.int usage warning, and flake8 warnings about superfluous lines at EOF.

[codecov]

Codecov Report

Merging #50 (23d6348) into master (9a22dcc) will increase coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
+ Coverage   97.18%   97.28%   +0.10%     
==========================================
  Files          36       36              
  Lines        2059     2100      +41     
==========================================
+ Hits         2001     2043      +42     
+ Misses         58       57       -1     

Impacted Files	Coverage Δ
deepnog/learning/tests/test_training.py	100.00% <ø> (ø)
deepnog/data/dataset.py	98.68% <100.00%> (ø)
deepnog/models/deepnog.py	97.01% <0.00%> (+0.09%)	⬆️
deepnog/client/tests/test_cli.py	100.00% <0.00%> (+0.62%)	⬆️

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