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OBMOCE

Module: opytimizer.optimizers.multi_objective.evolutionary.moce

Opposition Learning-based Multi-Objective Chaotic Evolution (OBMOCE).

Extends MOCE by integrating the OBL mechanism (CEcOB variant): for each individual, generates a chaotic vector and its opposite, then selects the next generation from the combined pool of current population + chaotic + opposite using non-dominated sorting and crowding distance.

Pool size per generation: 3 x PS.

References: Li, T., & Pei, Y. (2025). Opposition-based chaotic evolution for optimization. Scientific Reports, 15(1), 22718.

Constructor​

OBMOCE(params: Optional[Dict[str, Any]] = None, DR: float = 0.5, CR: float = 0.9, chaotic_system: Literal['logistic', 'gauss', 'tent', 'henon'] = 'logistic')

Parameters​

ParameterTypeDefaultDescription
paramsOptional[Dict[str, Any]]None—
DRfloat0.5—
CRfloat0.9—
chaotic_systemLiteral['logistic', 'gauss', 'tent', 'henon']'logistic'—

Methods​

compile​

compile(self, space: opytimizer.core.space._MultiObjectiveSpace)

Compiles additional information that is used by this optimizer.

This method is called before the optimization procedure and makes sure that the additional variable is available as a property.

Parameters​

ParameterTypeDefaultDescription
spaceopytimizer.core.space._MultiObjectiveSpace—

evaluate​

evaluate(self, space: opytimizer.core.space._MultiObjectiveSpace, function: opytimizer.core.function.Function)

Evaluates the search space according to the objective function.

Parameters​

ParameterTypeDefaultDescription
spaceopytimizer.core.space._MultiObjectiveSpaceA Space object that will be evaluated.
functionopytimizer.core.function.FunctionA Function object serving as an objective function.

update​

update(self, space: opytimizer.core.space._MultiObjectiveSpace, function: opytimizer.core.function.Function)

Updates the agents' position array.

As each child has a different procedure of update, you will need to implement it directly on its class.

Parameters​

ParameterTypeDefaultDescription
spaceopytimizer.core.space._MultiObjectiveSpace—
functionopytimizer.core.function.Function—