question: protected void check ( ) { double tsum ; int i , j ; double s = 0 ; for ( i = 0 ; i < examples_total ; i ++ ) { tsum = 0 ; s += alphas [ i ] ; for ( j = 0 ; j < examples . count_examples ( ) ; j ++ ) { tsum += alphas [ j ] * kernel . calculate_K ( i , j ) ; } ; if ( Math . abs ( tsum - sum [ i ] ) > is_zero ) { logln ( 1 , "ERROR: sum[" + i + "] off by " + ( tsum - sum [ i ] ) + " (is " + sum [ i ] + ", should be " + tsum ) ; } ; } ; tsum = 0.0 ; for ( j = 0 ; j < examples . count_examples ( ) ; j ++ ) { tsum += alphas [ j ] ; } ; if ( Math . abs ( tsum - 1 ) > is_zero ) { logln ( 1 , "ERROR: sum over all alphas is off by " + ( tsum - 1 ) ) ; } if ( Math . abs ( s + sum_alpha - 1 ) > is_zero ) { logln ( 1 , "ERROR: sum_alpha is off by " + ( s + sum_alpha - 1 ) ) ; } ; }
target:  check internal variables, for debugging only