opytimizer.optimizers.science.wwo

Water Wave Optimization.

class opytimizer.optimizers.science.wwo.WWO(params: Optional[Dict[str, Any]] = None)

A WWO class, inherited from Optimizer.

This is the designed class to define WWO-related variables and methods.

References

Y.-J. Zheng. Water wave optimization: A new nature-inspired metaheuristic. Computers & Operations Research (2015).

__init__(params: Optional[Dict[str, Any]] = None) → None

Initialization method.

Parameters:params – Contains key-value parameters to the meta-heuristics.

h_max

Maximum wave height.

alpha

Wave length reduction coefficient.

beta

Breaking coefficient.

k_max

Maximum number of breakings.

height

Array of heights.

length

Array of lengths.

compile(space: opytimizer.core.space.Space) → None

Compiles additional information that is used by this optimizer.

Parameters:space – A Space object containing meta-information.

_propagate_wave(agent: opytimizer.core.agent.Agent, function: opytimizer.core.function.Function, index: int) → opytimizer.core.agent.Agent

Propagates wave into a new position (eq. 6).

Parameters:

• agent – Current wave.
• function – A function object.
• index – Index of wave length.

Returns:

Propagated wave.

Return type:

(Agent)

_refract_wave(agent: opytimizer.core.agent.Agent, best_agent: opytimizer.core.agent.Agent, function: opytimizer.core.function.Function, index: int) → Tuple[float, float]

Refract wave into a new position (eq. 8-9).

Parameters:

• agent – Agent to be refracted.
• best_agent – Global best agent.
• function – A function object.
• index – Index of wave length.

Returns:

New height and length values.

Return type:

(Tuple[float, float])

_break_wave(wave: opytimizer.core.agent.Agent, function: opytimizer.core.function.Function, j: int) → opytimizer.core.agent.Agent

Breaks current wave into a new one (eq. 10).

Parameters:

• wave – Wave to be broken.
• function – A function object.
• j – Index of dimension to be broken.

Returns:

Broken wave.

Return type:

(Agent)

_update_wave_length(agents: List[opytimizer.core.agent.Agent]) → None

Updates the wave length of current population.

Parameters:agents – List of agents.

update(space: opytimizer.core.space.Space, function: opytimizer.core.function.Function) → None

Wraps Water Wave Optimization over all agents and variables.

Parameters:

• space – Space containing agents and update-related information.
• function – A function object.