Forward slection reduce mem copy

[Saniamos]

Description

Implements slicing the features from the data before copying it to the subprocess.

Related issues or pull requests

Fixes #704

Pull Request Checklist

• [x ] Added a note about the modification or contribution to the ./docs/sources/CHANGELOG.md file (if applicable)
• Added appropriate unit test functions in the ./mlxtend/*/tests directories (if applicable)
• Modify documentation in the corresponding Jupyter Notebook under mlxtend/docs/sources/ (if applicable)
• [ x] Ran 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)
• [x ] Checked for style issues by running flake8 ./mlxtend

[coveralls]

Coverage remained the same at 90.678% when pulling 0351253 on Saniamos:forward-slection-reduce-mem-copy into 6dfde8c on rasbt:master.

[rasbt]

Oh yeah, like you mentioned in #704, subprocesses require everything to be copied. You are right, we can slice the data before sending it to the processes. Thanks for implementing it!

[Saniamos]

Oh yeah, like you mentioned in #704, subprocesses require everything to be copied. You are right, we can slice the data before sending it to the processes. Thanks for implementing it!

sure, thanks for the quick merge :-)