DOC improve style of examples

[glemaitre]

Make another round of improvement in the example using seaborn figure style and last scikit-learn helpers

[pep8speaks]

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

• In the file examples/applications/plot_over_sampling_benchmark_lfw.py:

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• In the file examples/applications/plot_topic_classication.py:

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• In the file examples/combine/plot_comparison_combine.py:

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• In the file examples/datasets/plot_make_imbalance.py:

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• In the file examples/evaluation/plot_metrics.py:

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• In the file examples/model_selection/plot_validation_curve.py:

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• In the file examples/over-sampling/plot_comparison_over_sampling.py:

Line 16:1: E402 module level import not at top of file
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• In the file examples/over-sampling/plot_illustration_generation_sample.py:

Line 2:89: E501 line too long (95 > 88 characters)
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• In the file examples/over-sampling/plot_shrinkage_effect.py:

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• In the file examples/pipeline/plot_pipeline_classification.py:

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• In the file examples/under-sampling/plot_comparison_under_sampling.py:

Line 16:1: E402 module level import not at top of file
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• In the file examples/under-sampling/plot_illustration_nearmiss.py:

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• In the file examples/under-sampling/plot_illustration_tomek_links.py:

Line 15:1: E402 module level import not at top of file
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Comment last updated at 2021-02-17 19:08:32 UTC

[codecov]

Codecov Report

Merging #814 (e000d93) into master (2150e67) will decrease coverage by 3.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #814      +/-   ##
==========================================
- Coverage   98.59%   95.49%   -3.10%     
==========================================
  Files          93       93              
  Lines        6036     6035       -1     
  Branches      503      503              
==========================================
- Hits         5951     5763     -188     
- Misses         84      272     +188     
+ Partials        1        0       -1     

Impacted Files	Coverage Δ
imblearn/tensorflow/tests/test_generator.py	10.75% <0.00%> (-89.25%)	⬇️
imblearn/keras/tests/test_generator.py	7.93% <0.00%> (-84.13%)	⬇️
imblearn/tensorflow/_generator.py	35.48% <0.00%> (-64.52%)	⬇️
imblearn/keras/_generator.py	52.85% <0.00%> (-44.29%)	⬇️

---

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[lgtm-com]

This pull request fixes 1 alert when merging 77a9605 into 2150e67 - view on LGTM.com

fixed alerts:

• 1 for Variable defined multiple times

[lgtm-com]

This pull request fixes 1 alert when merging b63d336 into 2150e67 - view on LGTM.com

fixed alerts:

• 1 for Variable defined multiple times

[lgtm-com]

This pull request fixes 1 alert when merging 76e8507 into 2150e67 - view on LGTM.com

fixed alerts:

• 1 for Variable defined multiple times