// curve optimization called here- adjust optimization parameters here
internal void calculate()
{
FittingCost costFunction = costFunction_;
Constraint constraint = new NoConstraint();
// start with the guess solution, if it exists
Vector x = new Vector(size(), 0.0);
if (!curve_.guessSolution_.empty())
{
x = curve_.guessSolution_;
}
if (curve_.maxEvaluations_ == 0)
{
//Don't calculate, simply use given parameters to provide a fitted curve.
//This turns the fittedbonddiscountcurve into an evaluator of the parametric
//curve, for example allowing to use the parameters for a credit spread curve
//calculated with bonds in one currency to be coupled to a discount curve in
//another currency.
return;
}
//workaround for backwards compatibility
OptimizationMethod optimization = optimizationMethod_;
if (optimization == null)
{
optimization = new Simplex(curve_.simplexLambda_);
}
Problem problem = new Problem(costFunction, constraint, x);
double rootEpsilon = curve_.accuracy_;
double functionEpsilon = curve_.accuracy_;
double gradientNormEpsilon = curve_.accuracy_;
EndCriteria endCriteria = new EndCriteria(curve_.maxEvaluations_,
curve_.maxStationaryStateIterations_,
rootEpsilon,
functionEpsilon,
gradientNormEpsilon);
optimization.minimize(problem, endCriteria);
solution_ = problem.currentValue();
numberOfIterations_ = problem.functionEvaluation();
costValue_ = problem.functionValue();
// save the results as the guess solution, in case of recalculation
curve_.guessSolution_ = solution_;
}
public void OptimizersTest()
{
//("Testing optimizers...");
setup();
// Loop over problems (currently there is only 1 problem)
for (int i=0; i<costFunctions_.Count; ++i) {
Problem problem = new Problem(costFunctions_[i], constraints_[i], initialValues_[i]);
Vector initialValues = problem.currentValue();
// Loop over optimizers
for (int j = 0; j < (optimizationMethods_[i]).Count; ++j) {
double rootEpsilon = endCriterias_[i].rootEpsilon();
int endCriteriaTests = 1;
// Loop over rootEpsilon
for(int k=0; k<endCriteriaTests; ++k) {
problem.setCurrentValue(initialValues);
EndCriteria endCriteria = new EndCriteria(endCriterias_[i].maxIterations(),
endCriterias_[i].maxStationaryStateIterations(),
rootEpsilon,
endCriterias_[i].functionEpsilon(),
endCriterias_[i].gradientNormEpsilon());
rootEpsilon *= .1;
EndCriteria.Type endCriteriaResult =
optimizationMethods_[i][j].optimizationMethod.minimize(problem, endCriteria);
Vector xMinCalculated = problem.currentValue();
Vector yMinCalculated = problem.values(xMinCalculated);
// Check optimization results vs known solution
if (endCriteriaResult==EndCriteria.Type.None ||
endCriteriaResult==EndCriteria.Type.MaxIterations ||
endCriteriaResult==EndCriteria.Type.Unknown)
Assert.Fail("function evaluations: " + problem.functionEvaluation() +
" gradient evaluations: " + problem.gradientEvaluation() +
" x expected: " + xMinExpected_[i] +
" x calculated: " + xMinCalculated +
" x difference: " + (xMinExpected_[i]- xMinCalculated) +
" rootEpsilon: " + endCriteria.rootEpsilon() +
" y expected: " + yMinExpected_[i] +
" y calculated: " + yMinCalculated +
" y difference: " + (yMinExpected_[i]- yMinCalculated) +
" functionEpsilon: " + endCriteria.functionEpsilon() +
" endCriteriaResult: " + endCriteriaResult);
}
}
}
}
