OOB access in GLM SoftMax

[divyegala]

closes #3590

[codecov-io]

Codecov Report

Merging #3642 (1db5ad2) into branch-0.19 (fd9ec89) will increase coverage by 0.19%.
The diff coverage is 96.96%.

@@               Coverage Diff               @@
##           branch-0.19    #3642      +/-   ##
===============================================
+ Coverage        80.70%   80.90%   +0.19%     
===============================================
  Files              227      228       +1     
  Lines            17615    17752     +137     
===============================================
+ Hits             14217    14362     +145     
+ Misses            3398     3390       -8     

Flag	Coverage Δ
dask	45.26% <65.15%> (+0.27%)	⬆️
non-dask	73.07% <96.96%> (+0.16%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
python/cuml/cluster/kmeans.pyx	91.95% <ø> (ø)
python/cuml/fil/fil.pyx	91.83% <ø> (ø)
python/cuml/neighbors/__init__.py	100.00% <ø> (ø)
python/cuml/preprocessing/encoders.py	95.10% <ø> (+0.02%)	⬆️
python/cuml/common/memory_utils.py	79.26% <50.00%> (+0.15%)	⬆️
python/cuml/neighbors/ann.pyx	90.80% <80.00%> (+29.17%)	⬆️
...ython/cuml/dask/ensemble/randomforestclassifier.py	56.25% <100.00%> (-0.17%)	⬇️
python/cuml/ensemble/randomforestclassifier.pyx	73.40% <100.00%> (-0.09%)	⬇️
python/cuml/ensemble/randomforestregressor.pyx	75.91% <100.00%> (ø)
python/cuml/metrics/cluster/silhouette_score.pyx	100.00% <100.00%> (+1.81%)	⬆️
... and 52 more

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[wphicks]

LGTM!

[JohnZed]

@gpucibot merge