:: Experimental :: Trait for calculating information gain.
:: Experimental :: Class for calculating entropy during binary classification.
:: Experimental :: Class for calculating entropy during binary classification.
:: Experimental :: Class for calculating the Gini impurity during binary classification.
:: Experimental :: Class for calculating the Gini impurity during binary classification.
:: Experimental :: Class for calculating variance during regression
:: Experimental :: Class for calculating variance during regression
:: Experimental :: Trait for calculating information gain. This trait is used for (a) setting the impurity parameter in org.apache.spark.mllib.tree.configuration.Strategy (b) calculating impurity values from sufficient statistics.