protected static double sparsity ( final int setsize , final int dbsize , final int k , final double phi ) { // calculate sparsity c final double fK = MathUtil . powi ( 1. / phi , k ) ; return ( setsize - ( dbsize * fK ) ) / FastMath . sqrt ( dbsize * fK * ( 1 - fK ) ) ; }
Method to calculate the sparsity coefficient of .