Fix GMM covariances

[relf]

Fixes #321

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (39b3eee) 36.69% compared to head (4ce0db8) 36.73%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #322      +/-   ##
==========================================
+ Coverage   36.69%   36.73%   +0.03%     
==========================================
  Files          94       94              
  Lines        6240     6240              
==========================================
+ Hits         2290     2292       +2     
+ Misses       3950     3948       -2     

Files	Coverage Δ
...linfa-clustering/src/gaussian_mixture/algorithm.rs	47.17% <100.00%> (+0.27%)	⬆️

... and 6 files with indirect coverage changes

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[jamiesandenr]

Thanks for this. I've tested it and it fixes the problem I was having.

[relf]

@bytesnake, @quietlychris, could you merge this one? By the way, as @YuhanLiin is stepping away from linfa maintenance, I would like to let you know that I could help on this... like PR triage or even reviewing/merging this kind of PR.

[quietlychris]

Looks good, thank you!