Support deprecation of return_train_scores in 0.19.1

dask / dask-searchcv

dask-searchcv is now part of dask-ml: https://github.com/dask/dask-ml

BSD 3-Clause "New" or "Revised" License

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Closed jcrist closed 6 years ago

jcrist commented 6 years ago

In scikit-learn 0.19.1, return_train_score=True was deprecated. The deprecation behavior is:

If not set by user, raise warning if any train score results are accessed in cv_results. They handle this with a special dictionary class to raise the warning.
If set by user to True or False, no warning is given.

We duplicate this behavior for scikit-learn >= 0.19.1