Package org.cicirello.search.problems
Class GramacyLee2012
 java.lang.Object

 org.cicirello.search.problems.GramacyLee2012

 All Implemented Interfaces:
Splittable<Initializer<SingleReal>>
,Initializer<SingleReal>
,OptimizationProblem<SingleReal>
,Problem<SingleReal>
public final class GramacyLee2012 extends Object implements OptimizationProblem<SingleReal>, Initializer<SingleReal>
A continuous function with a large number of local minimums, and a single global minimum, defined for input x in [0.5, 2.5].
This minimization problem was introduced in:
 Gramacy, R.B.; Lee, H.K.H. Cases for the nugget in modeling computer experiments. Statistics and Computing 2012, 22, 713–722. doi:10.1007/s112220109224x.


Constructor Summary
Constructors Constructor Description GramacyLee2012()
Constructs the GramacyLee2012 cost function.

Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description double
cost(SingleReal candidate)
Computes the cost of a candidate solution to the problem instance.SingleReal
createCandidateSolution()
Creates one candidate solution to a problem.GramacyLee2012
split()
Generates a functionally identical copy of this object, for use in multithreaded implementations of search algorithms.double
value(SingleReal candidate)
Computes the value of the candidate solution within the usual constraints and interpretation of the problem.
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.cicirello.search.problems.OptimizationProblem
getSolutionCostPair, isMinCost, minCost




Method Detail

cost
public double cost(SingleReal candidate)
Description copied from interface:OptimizationProblem
Computes the cost of a candidate solution to the problem instance. The lower the cost, the more optimal the candidate solution. Specified by:
cost
in interfaceOptimizationProblem<SingleReal>
 Parameters:
candidate
 The candidate solution to evaluate. Returns:
 The cost of the candidate solution. Lower cost means better solution.

value
public double value(SingleReal candidate)
Description copied from interface:OptimizationProblem
Computes the value of the candidate solution within the usual constraints and interpretation of the problem. Specified by:
value
in interfaceOptimizationProblem<SingleReal>
 Parameters:
candidate
 The candidate solution to evaluate. Returns:
 The actual optimization value of the candidate solution.

createCandidateSolution
public SingleReal createCandidateSolution()
Description copied from interface:Initializer
Creates one candidate solution to a problem. Specified by:
createCandidateSolution
in interfaceInitializer<SingleReal>
 Returns:
 a candidate solution to a problem instance.

split
public GramacyLee2012 split()
Description copied from interface:Splittable
Generates a functionally identical copy of this object, for use in multithreaded implementations of search algorithms. The state of the object that is returned may or may not be identical to that of the original. Thus, this is a distinct concept from the functionality of theCopyable
interface. Classes that implement this interface must ensure that the object returned performs the same functionality, and that it does not share any state data that would be either unsafe or inefficient for concurrent access by multiple threads. The split method is allowed to simply return the this reference, provided that it is both safe and efficient for multiple threads to share a single copy of the Splittable object. The intention is to provide a multithreaded search with the capability to provide spawned threads with their own distinct search operators. Such multithreaded algorithms can call the split method for each thread it spawns to generate a functionally identical copy of the operator, but with independent state. Specified by:
split
in interfaceSplittable<Initializer<SingleReal>>
 Returns:
 A functionally identical copy of the object, or a reference to this if it is both safe and efficient for multiple threads to share a single instance of this Splittable object.

