MNT update test framework for sklearn 0.24

[glemaitre]

Update test framework to be compatible with scikit-learn 0.24

[pep8speaks]

Hello @glemaitre! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file doc/conf.py:

Line 23:1: E402 module level import not at top of file
Line 24:1: E402 module level import not at top of file
Line 24:1: F401 'sphinx_gallery' imported but unused
Line 88:1: E402 module level import not at top of file

Comment last updated at 2021-02-08 19:35:08 UTC

[codecov]

Codecov Report

Merging #788 (3f9f10d) into master (2a0376e) will increase coverage by 1.98%.
The diff coverage is 99.41%.

@@            Coverage Diff             @@
##           master     #788      +/-   ##
==========================================
+ Coverage   96.55%   98.53%   +1.98%     
==========================================
  Files          82       89       +7     
  Lines        5140     5683     +543     
  Branches        0      476     +476     
==========================================
+ Hits         4963     5600     +637     
+ Misses        177       82      -95     
- Partials        0        1       +1     

Impacted Files	Coverage Δ
imblearn/combine/_smote_enn.py	100.00% <ø> (ø)
imblearn/combine/_smote_tomek.py	100.00% <ø> (ø)
imblearn/datasets/_imbalance.py	88.23% <ø> (ø)
imblearn/datasets/_zenodo.py	96.77% <ø> (ø)
imblearn/ensemble/_bagging.py	97.82% <ø> (ø)
imblearn/ensemble/_easy_ensemble.py	100.00% <ø> (ø)
imblearn/ensemble/_forest.py	97.36% <ø> (ø)
imblearn/ensemble/_weight_boosting.py	97.75% <ø> (ø)
imblearn/keras/_generator.py	97.14% <ø> (+44.28%)	⬆️
imblearn/over_sampling/_adasyn.py	98.41% <ø> (ø)
... and 34 more

---

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