question: private void rescalePriors ( ExampleSet exampleSet , double [ ] classPriors ) { double [ ] weights = new double [ 2 ] ; for ( int i = 0 ; i < weights . length ; i ++ ) { weights [ i ] = 1.0d / ( weights . length * classPriors [ i ] ) ; } Iterator < Example > exRead = exampleSet . iterator ( ) ; while ( exRead . hasNext ( ) ) { Example example = exRead . next ( ) ; example . setWeight ( weights [ ( int ) example . getLabel ( ) ] ) ; } }
target:  Computes the weighted class priors of the boolean target attribute and shifts weights so that the priors are equal afterwards.