Build fixes

[YuhanLiin]

resolves #311

[codecov-commenter]

Codecov Report

Attention: 67 lines in your changes are missing coverage. Please review.

Comparison is base (4adece5) 37.08% compared to head (87e7325) 36.60%.
Report is 3 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #319      +/-   ##
==========================================
- Coverage   37.08%   36.60%   -0.49%     
==========================================
  Files          94       94              
  Lines        6196     6240      +44     
==========================================
- Hits         2298     2284      -14     
- Misses       3898     3956      +58     

Files	Coverage Δ
algorithms/linfa-ftrl/src/hyperparams.rs	15.38% <ø> (ø)
algorithms/linfa-ftrl/src/lib.rs	16.66% <ø> (+8.33%)	⬆️
algorithms/linfa-logistic/src/float.rs	0.00% <ø> (ø)
algorithms/linfa-logistic/src/hyperparams.rs	32.35% <ø> (-5.89%)	⬇️
src/dataset/mod.rs	33.33% <ø> (+3.70%)	⬆️
src/metrics_classification.rs	38.36% <ø> (+0.78%)	⬆️
algorithms/linfa-logistic/src/lib.rs	45.62% <47.82%> (-1.83%)	⬇️
algorithms/linfa-logistic/src/argmin_param.rs	10.95% <1.78%> (-33.49%)	⬇️

... and 65 files with indirect coverage changes

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