Row major Gram matrices

[tfeher]

This PR add row major Gram matrices. These will be used in SVM kernels to allow flexibility in the input layout (#2198).

For the benchmarked cases, row major input is around 2.5% slower on average.

[teju85]

@tfeher So, your comparison above is only on the gram-matrix kernels and NOT the end-to-end SVM perf, right?

[teju85]

Changes LGTM.

[dantegd]

@tfeher the only thing missing to merge are a couple of updates to copyright years:

Copyright headers incomplete in some of the files!

  cpp/bench/prims/gram_matrix.cu:2 Issue: Current year not included in the copyright header
  cpp/src_prims/matrix/grammatrix.cuh:2 Issue: Current year not included in the copyright header

[tfeher]

So, your comparison above is only on the gram-matrix kernels and NOT the end-to-end SVM perf, right?

Yes, the comparison above is only for the kernels. In this PR the row major kernels are not yet used by SVM.

[tfeher]

rerun tests

[codecov-io]

Codecov Report

Merging #3639 (526f14a) into branch-0.19 (14bd6c1) will increase coverage by 1.58%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           branch-0.19    #3639      +/-   ##
===============================================
+ Coverage        80.72%   82.30%   +1.58%     
===============================================
  Files              228      227       -1     
  Lines            17629    17591      -38     
===============================================
+ Hits             14231    14479     +248     
+ Misses            3398     3112     -286     

Flag	Coverage Δ
dask	46.42% <ø> (+1.45%)	⬆️
non-dask	74.27% <ø> (+1.33%)	⬆️

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

Impacted Files	Coverage Δ
python/cuml/_thirdparty/sklearn/utils/_pprint.py	0.00% <0.00%> (-27.54%)	⬇️
python/cuml/linear_model/linear_regression.pyx	88.23% <0.00%> (-3.53%)	⬇️
python/cuml/cluster/dbscan.pyx	98.19% <0.00%> (-1.81%)	⬇️
...hirdparty/sklearn/preprocessing/_discretization.py	83.59% <0.00%> (-0.62%)	⬇️
python/cuml/solvers/qn.pyx	97.20% <0.00%> (-0.43%)	⬇️
python/cuml/dask/solvers/cd.py	100.00% <0.00%> (ø)
python/cuml/cluster/__init__.py	100.00% <0.00%> (ø)
python/cuml/common/doc_utils.py	100.00% <0.00%> (ø)
python/cuml/pipeline/__init__.py	100.00% <0.00%> (ø)
python/cuml/common/numba_utils.py	0.00% <0.00%> (ø)
... and 60 more

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[dantegd]

@gpucibot merge