[SPARK-9478] [ml] Add class weights to Random Forest#13851

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n-triple-a wants to merge 18 commits intoapache:masterfrom

n-triple-a:weightedRandomForest

Commits on Jun 7, 2016

Modify impurity implementations, NOTICE: a further modification is needed(getCalculator & fromString method)

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save changes, but compile error exists

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simple testSuites and run properly

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add unbalenced data test case, modify label prediction process s.t. the predictions are correct with Impurity=WeightedGini

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Make Decision Tree predicions correct without changing the base class ProbClassifier, but changing the definition of Impurity and DecTreClassifier

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Commits on Jun 10, 2016

1.put classweight def to the right area 2.change interfaces of getOldStrategy 3.make classweights can be passed when reconstructing the tree, including json read/write

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Commits on Jun 15, 2016

add SetClassWeights to RandomForestClassifier

Yuewei Na
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change code style such that requirements are met

Yuewei Na
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random forest with class weights runs properly

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Commits on Jun 16, 2016

minor changes

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Commits on Jun 17, 2016

add Strategy new param doc

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move classW def to DeTrParam class

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remove @BeanProperty

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change getOldImpu interfaces

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Commits on Jun 20, 2016

first version that pass all run_test, by adding redundant constructor and reverting getOldStrategy to old versions

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Commits on Jun 21, 2016

first version that pass all tests

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minor modifications for code styling

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Commits on Jun 22, 2016

Minor code style modificaions

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