install scikit-learn 0.23.1 as a bundle and include required threadpoolctl extension

[boegel]

(created using eb --new-pr)

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in this PR)
node2583.golett.os - Linux centos linux 7.8.2003, x86_64, Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz (haswell), Python 2.7.5
See https://gist.github.com/c30becffa4c5b255d5e3d87670010112 for a full test report.

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in this PR)
generoso - Linux centos linux 8.2.2004, x86_64, Intel(R) Xeon(R) CPU E5-2667 v3 @ 3.20GHz (haswell), Python 3.6.8
See https://gist.github.com/e670062b47807e1aa57078f4eb1076ca for a full test report.

[boegel]

I noticed that threadpoolctl was missing when pip check was failing when installing pySCENIC (which depends on scikit-learn, PR coming soon).

It's unclear to me why pip check doesn't barf when installing scikit-learn itself, but I'm guessing that has something to do with not properly registering the dependency (they're using some how grown approach it seems, see https://github.com/scikit-learn/scikit-learn/blob/master/sklearn/_build_utils/min_dependencies.py).

[boegel]

Turns out this was overlooked due to a bug in PythonPackage, see easybuilders/easybuild-easyblocks#2114...

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in this PR)
node3411.kirlia.os - Linux centos linux 7.8.2003, x86_64, Intel(R) Xeon(R) Gold 6240 CPU @ 2.60GHz (cascadelake), Python 2.7.5
See https://gist.github.com/821e922fb686bb1b3a3dd86c9f78f095 for a full test report.

[boegel]

Last test report was on top of the fixed PythonPackage easyblock rom #2114 (but this PR doesn't require that one).

[boegel]

This is not an issue for previous scikit-learn versions (scikit-learn-0.21.3-foss-2019b-Python-3.7.4.eb for example), because threadpoolctl is a new dependency.

[smoors]

Test report by @smoors
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in this PR)
node254.hydra.os - Linux centos linux 7.7.1908, x86_64, Intel(R) Xeon(R) CPU E5-2683 v4 @ 2.10GHz (broadwell), Python 2.7.5
See https://gist.github.com/6f7ee46afaa346debb3beec31e069254 for a full test report.

[migueldiascosta]

Test report by @migueldiascosta
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in this PR)
sms - Linux centos linux 7.6.1810, x86_64, AMD EPYC 7601 32-Core Processor (zen), Python 2.7.5
See https://gist.github.com/dad76c08cfdd83ef125375ab12044688 for a full test report.

[smoors]

lgtm

[smoors]

Going in, thanks @boegel!