Function gradient

dependency/densecrf/src/optimization.cpp:116–120

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