OrdoAbChao b4f952bd22 [Breaking] Remove Scikit-Learn default parameters (#5130)
* Simplify Scikit-Learn parameter management.

* Copy base class for removing duplicated parameter signatures.
* Set all parameters to None.
* Handle None in set_param.
* Extract the doc.

Co-authored-by: Jiaming Yuan <jm.yuan@outlook.com>
2020-01-23 20:25:20 +08:00
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