Method backwardGrad

test_spline_optimizer.cpp:142–147

struct ScalingSpatialMap
{
    using VectorType = Eigen::Matrix<double, DIM, 1>;

    explicit ScalingSpatialMap(double scale_in = 1.0) : scale(scale_in) {}

    int getUnconstrainedDim(int index) const
    {
        (void)index;
        return DIM;
    }