Function gradCheck

dependency/densecrf/src/optimization.cpp:121–126

	return r;
}
double gradCheck( EnergyFunction & efun, const VectorXf & x, float EPS ) {
	VectorXf ng = numericGradient( efun, x, EPS );
	VectorXf g( x.rows() );
	efun.gradient( x, g );
	return (ng-g).norm();
}

VectorXf computeFunction( EnergyFunction & efun, const VectorXf & x, const VectorXf & dx, int n_samples ) {
	VectorXf r( n_samples );