Impurity Function

Equations

Gini Impurity

H ( X m ) = k p m k ( 1 p m k )

Information Entropy

H ( X m ) = k p m k log ( p m k )

Mean Square Error

H ( X m ) = 1 N m i N m ( y y ¯ m ) 2

Absolute Mean Error

H ( X m ) = 1 N m i N m ( y y ¯ m ) 2