EHN: random sampler can sample from heterogeneous data

[glemaitre]

closes #429

[pep8speaks]

Hello @glemaitre! Thanks for updating the PR.

Cheers ! There are no PEP8 issues in this Pull Request. 🍻

Comment last updated on August 23, 2018 at 12:58 Hours UTC

[codecov]

Codecov Report

Merging #451 into master will decrease coverage by 0.03%.
The diff coverage is 96.77%.

@@            Coverage Diff             @@
##           master     #451      +/-   ##
==========================================
- Coverage   98.78%   98.75%   -0.04%     
==========================================
  Files          75       75              
  Lines        4446     4492      +46     
==========================================
+ Hits         4392     4436      +44     
- Misses         54       56       +2

Impacted Files	Coverage Δ
imblearn/ensemble/base.py	96.15% <100%> (ø)	⬆️
imblearn/combine/smote_enn.py	100% <100%> (ø)	⬆️
...otype_selection/tests/test_random_under_sampler.py	100% <100%> (ø)	⬆️
imblearn/combine/smote_tomek.py	100% <100%> (ø)	⬆️
...mpling/prototype_selection/random_under_sampler.py	100% <100%> (ø)	⬆️
...rn/over_sampling/tests/test_random_over_sampler.py	100% <100%> (ø)	⬆️
imblearn/over_sampling/random_over_sampler.py	100% <100%> (ø)	⬆️
imblearn/utils/validation.py	99.39% <75%> (-0.61%)	⬇️
imblearn/utils/estimator_checks.py	96.76% <95.83%> (-0.12%)	⬇️

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