Add contour kwargs to plot_decision_regions. #881
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Code of Conduct
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Description
I added a kwargs keyword to control how the lines between decision regions look. I needed this for a thing, so I thought I'd make it a pull request. I think I followed the logic of the other two kwargs arguments correctly.
Related issues or pull requests
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Pull Request Checklist
./docs/sources/CHANGELOG.md
file (if applicable)./mlxtend/*/tests
directories (if applicable)mlxtend/docs/sources/
(if applicable)PYTHONPATH='.' pytest ./mlxtend -sv
and make sure that all unit tests pass (for small modifications, it might be sufficient to only run the specific test file, e.g.,PYTHONPATH='.' pytest ./mlxtend/classifier/tests/test_stacking_cv_classifier.py -sv
)flake8 ./mlxtend