/** {@inheritDoc} */
@Override
public Evaluation evaluate(final RealVector point) {
// Copy so optimizer can change point without changing our instance.
final RealVector p =
paramValidator == null ? point.copy() : paramValidator.validate(point.copy());
if (lazyEvaluation) {
return new LazyUnweightedEvaluation((ValueAndJacobianFunction) model, target, p);
} else {
// Evaluate value and jacobian in one function call.
final Pair<RealVector, RealMatrix> value = model.value(p);
return new UnweightedEvaluation(value.getFirst(), value.getSecond(), target, p);
}
}
/**
* Get the function value tensor.
*
* @param point The point.
* @param bandwidth The bandwidth grid.
* @return The function value tensor.
*/
private double[] getFunctionValueTensor(final double[] point, final double[] bandwidth) {
double[] tensor = new double[finiteDifference.getCoefficients().length];
// use the iteration helper.
RowMajorIteration iteration =
new RowMajorIteration(finiteDifference.getFiniteDifferenceLengths());
for (Pair<int[], Integer> index : iteration) {
int[] multi = index.getFirst();
// get the point with bandwidth shifts applied.
double[] indexPoint = getPointForIndex(point, bandwidth, multi);
double functionValue = function.value(indexPoint);
// and store in the proper place in the tensor.
int arrayIndex = index.getSecond();
tensor[arrayIndex] = functionValue;
}
return tensor;
}