question: public static double L_LogLoss ( double y , double rpred , double C ) { double ans = Math . min ( Utils . eq ( y , rpred ) ? 0.0 : - ( ( y * Math . log ( rpred ) ) + ( ( 1.0 - y ) * Math . log ( 1.0 - rpred ) ) ) , C ) ; return ( Double . isNaN ( ans ) ? 0.0 : ans ) ; }
target:  L_LogLoss - the log loss between real-valued confidence rpred and true prediction y.