FIL and Dask demo

[miroenev]

• Replaced numpy with cupy, and sklearn with cuml (e.g., data generation and splitting)
• Resized XGBoost model params from 15 trees at 25 max_depth, to 100 trees at 20 max_depth
• Added Dask distributed data generation, FIL model loading on worker init, and distributed FIL prediction

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[wphicks]

Really nice demo! I'm going to be referring to this one a lot in the future.

A few small items in comments. The only overall thing is don't forget to clear outputs before you finalize the PR to allow this to be run in CI.

[wphicks]

One last formatting thing in comments, but this LGTM!

[wphicks]

Oops! Think the cell outputs came back

[miroenev]

That was odd, should be cleared now. thanks!

[wphicks]

LGTM!

[codecov-io]

Codecov Report

Merging #3698 (edeeecc) into branch-0.19 (fd9ec89) will increase coverage by 2.23%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           branch-0.19    #3698      +/-   ##
===============================================
+ Coverage        80.70%   82.94%   +2.23%     
===============================================
  Files              227      227              
  Lines            17615    17726     +111     
===============================================
+ Hits             14217    14702     +485     
+ Misses            3398     3024     -374     

Flag	Coverage Δ
dask	46.40% <ø> (+1.41%)	⬆️
non-dask	75.02% <ø> (+2.11%)	⬆️

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

Impacted Files	Coverage Δ
python/cuml/__init__.py	95.45% <ø> (+0.06%)	⬆️
...cuml/_thirdparty/sklearn/preprocessing/__init__.py	100.00% <ø> (ø)
...on/cuml/_thirdparty/sklearn/preprocessing/_data.py	64.40% <ø> (+1.29%)	⬆️
...hirdparty/sklearn/preprocessing/_discretization.py	83.33% <ø> (-0.88%)	⬇️
...l/_thirdparty/sklearn/preprocessing/_imputation.py	85.54% <ø> (+22.74%)	⬆️
python/cuml/_thirdparty/sklearn/utils/extmath.py	56.89% <ø> (ø)
...cuml/_thirdparty/sklearn/utils/skl_dependencies.py	80.00% <ø> (+26.07%)	⬆️
...ython/cuml/_thirdparty/sklearn/utils/validation.py	18.41% <ø> (-4.04%)	⬇️
python/cuml/cluster/__init__.py	100.00% <ø> (ø)
python/cuml/cluster/agglomerative.pyx	96.47% <ø> (ø)
... and 175 more

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[JohnZed]

@gpucibot merge