NeatChromosomeRandomMutationHandler.java

package net.bmahe.genetics4j.neat.mutation.chromosome;

import java.util.List;
import java.util.Objects;
import java.util.random.RandomGenerator;

import net.bmahe.genetics4j.core.spec.mutation.RandomMutation;
import net.bmahe.genetics4j.neat.Connection;
import net.bmahe.genetics4j.neat.chromosomes.NeatChromosome;

/**
 * Mutation handler that applies random weight replacement to NEAT chromosomes using the core
 * {@link RandomMutation} policy. Each mutated connection receives a new weight sampled uniformly
 * from the chromosome's valid weight range.
 *
 * <p>For distribution-controlled weight mutation (e.g. Gaussian perturbation, configurable
 * perturbation ratio), use {@link net.bmahe.genetics4j.neat.spec.mutation.NeatConnectionWeight}
 * with {@link NeatChromosomeConnectionWeightMutationHandler} instead.
 */
public class NeatChromosomeRandomMutationHandler
		extends AbstractNeatChromosomeConnectionMutationHandler<RandomMutation>
{

	public NeatChromosomeRandomMutationHandler(final RandomGenerator _randomGenerator) {
		super(RandomMutation.class, _randomGenerator);
	}

	@Override
	protected List<Connection> mutateConnection(final RandomMutation randomMutation, final NeatChromosome neatChromosome,
			final Connection oldConnection, final int i) {
		Objects.requireNonNull(randomMutation);
		Objects.requireNonNull(neatChromosome);
		Objects.requireNonNull(oldConnection);

		final var connectionBuilder = Connection.builder().from(oldConnection);

		final var minValue = neatChromosome.getMinWeightValue();
		final var maxValue = neatChromosome.getMaxWeightValue();

		final var randomGenerator = getRandomGenerator();

		float newWeight = randomGenerator.nextFloat(maxValue - minValue) + minValue;
		connectionBuilder.weight(newWeight);
		return List.of(connectionBuilder.build());
	}
}









Active mutators

CONDITIONALS_BOUNDARY
CONSTRUCTOR_CALLS
EMPTY_RETURNS
EXPERIMENTAL_ARGUMENT_PROPAGATION
EXPERIMENTAL_BIG_DECIMAL
EXPERIMENTAL_BIG_INTEGER
EXPERIMENTAL_MEMBER_VARIABLE
EXPERIMENTAL_NAKED_RECEIVER
EXPERIMENTAL_REMOVE_SWITCH_MUTATOR_[0-99]
EXPERIMENTAL_SWITCH
FALSE_RETURNS
INCREMENTS
INLINE_CONSTS
INVERT_NEGS
MATH
NEGATE_CONDITIONALS
NON_VOID_METHOD_CALLS
NULL_RETURNS
PRIMITIVE_RETURNS
REMOVE_CONDITIONALS_EQUAL_ELSE
REMOVE_CONDITIONALS_EQUAL_IF
REMOVE_CONDITIONALS_ORDER_ELSE
REMOVE_CONDITIONALS_ORDER_IF
REMOVE_INCREMENTS
TRUE_RETURNS
VOID_METHOD_CALLS

Tests examined

net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest.[engine:junit-jupiter]/[class:net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest]/[method:mutateConnection()] (1 ms)

Report generated by PIT 1.25.7 support

1		package net.bmahe.genetics4j.neat.mutation.chromosome;
2
3		import java.util.List;
4		import java.util.Objects;
5		import java.util.random.RandomGenerator;
6
7		import net.bmahe.genetics4j.core.spec.mutation.RandomMutation;
8		import net.bmahe.genetics4j.neat.Connection;
9		import net.bmahe.genetics4j.neat.chromosomes.NeatChromosome;
10
11		/**
12		* Mutation handler that applies random weight replacement to NEAT chromosomes using the core
13		* {@link RandomMutation} policy. Each mutated connection receives a new weight sampled uniformly
14		* from the chromosome's valid weight range.
15		*
16		* <p>For distribution-controlled weight mutation (e.g. Gaussian perturbation, configurable
17		* perturbation ratio), use {@link net.bmahe.genetics4j.neat.spec.mutation.NeatConnectionWeight}
18		* with {@link NeatChromosomeConnectionWeightMutationHandler} instead.
19		*/
20		public class NeatChromosomeRandomMutationHandler
21		extends AbstractNeatChromosomeConnectionMutationHandler<RandomMutation>
22		{
23
24		public NeatChromosomeRandomMutationHandler(final RandomGenerator _randomGenerator) {
25		super(RandomMutation.class, _randomGenerator);
26		}
27
28		@Override
29		protected List<Connection> mutateConnection(final RandomMutation randomMutation, final NeatChromosome neatChromosome,
30		final Connection oldConnection, final int i) {
31		Objects.requireNonNull(randomMutation);
32		Objects.requireNonNull(neatChromosome);
33		Objects.requireNonNull(oldConnection);
34
35	3 1. mutateConnection : replaced call to net/bmahe/genetics4j/neat/Connection$Builder::from with receiver → KILLED 2. mutateConnection : removed call to net/bmahe/genetics4j/neat/Connection::builder → KILLED 3. mutateConnection : removed call to net/bmahe/genetics4j/neat/Connection$Builder::from → KILLED	final var connectionBuilder = Connection.builder().from(oldConnection);
36
37	1 1. mutateConnection : removed call to net/bmahe/genetics4j/neat/chromosomes/NeatChromosome::getMinWeightValue → KILLED	final var minValue = neatChromosome.getMinWeightValue();
38	1 1. mutateConnection : removed call to net/bmahe/genetics4j/neat/chromosomes/NeatChromosome::getMaxWeightValue → SURVIVED	final var maxValue = neatChromosome.getMaxWeightValue();
39
40	1 1. mutateConnection : removed call to net/bmahe/genetics4j/neat/mutation/chromosome/NeatChromosomeRandomMutationHandler::getRandomGenerator → KILLED	final var randomGenerator = getRandomGenerator();
41
42	4 1. mutateConnection : Replaced float subtraction with addition → SURVIVED 2. mutateConnection : removed call to java/util/random/RandomGenerator::nextFloat → KILLED 3. mutateConnection : Replaced float addition with subtraction → KILLED 4. mutateConnection : replaced call to java/util/random/RandomGenerator::nextFloat with argument → KILLED	float newWeight = randomGenerator.nextFloat(maxValue - minValue) + minValue;
43	2 1. mutateConnection : replaced call to net/bmahe/genetics4j/neat/Connection$Builder::weight with receiver → KILLED 2. mutateConnection : removed call to net/bmahe/genetics4j/neat/Connection$Builder::weight → KILLED	connectionBuilder.weight(newWeight);
44	3 1. mutateConnection : replaced return value with Collections.emptyList for net/bmahe/genetics4j/neat/mutation/chromosome/NeatChromosomeRandomMutationHandler::mutateConnection → KILLED 2. mutateConnection : removed call to net/bmahe/genetics4j/neat/Connection$Builder::build → KILLED 3. mutateConnection : removed call to java/util/List::of → KILLED	return List.of(connectionBuilder.build());
45		}
46		}
		Mutations
35		1.1 Location : mutateConnection Killed by : net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest.[engine:junit-jupiter]/[class:net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest]/[method:mutateConnection()] replaced call to net/bmahe/genetics4j/neat/Connection$Builder::from with receiver → KILLED 2.2 Location : mutateConnection Killed by : net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest.[engine:junit-jupiter]/[class:net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest]/[method:mutateConnection()] removed call to net/bmahe/genetics4j/neat/Connection::builder → KILLED 3.3 Location : mutateConnection Killed by : net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest.[engine:junit-jupiter]/[class:net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest]/[method:mutateConnection()] removed call to net/bmahe/genetics4j/neat/Connection$Builder::from → KILLED
37		1.1 Location : mutateConnection Killed by : net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest.[engine:junit-jupiter]/[class:net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest]/[method:mutateConnection()] removed call to net/bmahe/genetics4j/neat/chromosomes/NeatChromosome::getMinWeightValue → KILLED
38		1.1 Location : mutateConnection Killed by : none removed call to net/bmahe/genetics4j/neat/chromosomes/NeatChromosome::getMaxWeightValue → SURVIVED Covering tests Covered by tests: net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest.[engine:junit-jupiter]/[class:net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest]/[method:mutateConnection()]
40		1.1 Location : mutateConnection Killed by : net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest.[engine:junit-jupiter]/[class:net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest]/[method:mutateConnection()] removed call to net/bmahe/genetics4j/neat/mutation/chromosome/NeatChromosomeRandomMutationHandler::getRandomGenerator → KILLED
42		1.1 Location : mutateConnection Killed by : net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest.[engine:junit-jupiter]/[class:net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest]/[method:mutateConnection()] removed call to java/util/random/RandomGenerator::nextFloat → KILLED 2.2 Location : mutateConnection Killed by : none Replaced float subtraction with addition → SURVIVED Covering tests Covered by tests: net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest.[engine:junit-jupiter]/[class:net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest]/[method:mutateConnection()] 3.3 Location : mutateConnection Killed by : net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest.[engine:junit-jupiter]/[class:net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest]/[method:mutateConnection()] Replaced float addition with subtraction → KILLED 4.4 Location : mutateConnection Killed by : net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest.[engine:junit-jupiter]/[class:net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest]/[method:mutateConnection()] replaced call to java/util/random/RandomGenerator::nextFloat with argument → KILLED
43		1.1 Location : mutateConnection Killed by : net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest.[engine:junit-jupiter]/[class:net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest]/[method:mutateConnection()] replaced call to net/bmahe/genetics4j/neat/Connection$Builder::weight with receiver → KILLED 2.2 Location : mutateConnection Killed by : net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest.[engine:junit-jupiter]/[class:net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest]/[method:mutateConnection()] removed call to net/bmahe/genetics4j/neat/Connection$Builder::weight → KILLED
44		1.1 Location : mutateConnection Killed by : net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest.[engine:junit-jupiter]/[class:net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest]/[method:mutateConnection()] replaced return value with Collections.emptyList for net/bmahe/genetics4j/neat/mutation/chromosome/NeatChromosomeRandomMutationHandler::mutateConnection → KILLED 2.2 Location : mutateConnection Killed by : net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest.[engine:junit-jupiter]/[class:net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest]/[method:mutateConnection()] removed call to net/bmahe/genetics4j/neat/Connection$Builder::build → KILLED 3.3 Location : mutateConnection Killed by : net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest.[engine:junit-jupiter]/[class:net.bmahe.genetics4j.neat.mutation.chromosome.NeatChromosomeRandomMutationHandlerTest]/[method:mutateConnection()] removed call to java/util/List::of → KILLED

NeatChromosomeRandomMutationHandler.java

Mutations

Active mutators

Tests examined