org.oakgp.rank.fitness

Class TestDataFitnessFunction<T>

java.lang.Object

org.oakgp.rank.fitness.TestDataFitnessFunction<T>

Type Parameters:

T - the type of the expected values

All Implemented Interfaces:

FitnessFunction

public final class TestDataFitnessFunction<T>
extends Object
implements FitnessFunction

Calculates the fitness of a potential solution by comparing its results against the expected values.

Constructor Summary

Constructors

Constructor and Description
TestDataFitnessFunction(Map<Assignments,T> tests, ToDoubleBiFunction<T,T> rankingFunction) Creates a TestDataFitnessFunction which uses the given test cases and ranking function to determine the suitability of candidates.

Method Summary

Modifier and Type	Method and Description
static TestDataFitnessFunction<Integer>	createIntegerTestDataFitnessFunction(Map<Assignments,Integer> tests) Returns a new FitnessFunction which uses the specified test data to assess the fitness of potential solutions.
double	evaluate(Node node) Evaluates the specified Node using the test data specified when this FitnessFunction was constructed.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TestDataFitnessFunction

public TestDataFitnessFunction(Map<Assignments,T> tests,
                               ToDoubleBiFunction<T,T> rankingFunction)

Creates a TestDataFitnessFunction which uses the given test cases and ranking function to determine the suitability of candidates.

Parameters:

tests - a collection of test cases which associate an Assignments (used as input to Node.evaluate(Assignments)) with the corresponding expected outcome

rankingFunction - accepts the expected value (as the first argument) and the actual value (as the second argument) of applying a test case (as represented as an entry in tests and returns a fitness value

Method Detail

createIntegerTestDataFitnessFunction

public static TestDataFitnessFunction<Integer> createIntegerTestDataFitnessFunction(Map<Assignments,Integer> tests)

Returns a new FitnessFunction which uses the specified test data to assess the fitness of potential solutions.

Parameters:

tests - test data which associates a collection of inputs with their expected outcomes

evaluate

public double evaluate(Node node)

Evaluates the specified Node using the test data specified when this FitnessFunction was constructed.

Specified by:

evaluate in interface FitnessFunction

Parameters:

node - the potential solution that whose fitness will be determined

Returns:

the accumulative difference between the expected and actual outputs of evaluating node using each of the inputs of the test data