opytimizer.optimizers.population.ppa¶
Parasitism-Predation Algorithm.
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class
opytimizer.optimizers.population.ppa.
PPA
(params: Optional[Dict[str, Any]] = None)¶ A PPA class, inherited from Optimizer.
This is the designed class to define PPA-related variables and methods.
References
A. Mohamed et al. Parasitism – Predation algorithm (PPA): A novel approach for feature selection. Ain Shams Engineering Journal (2020).
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__init__
(params: Optional[Dict[str, Any]] = None) → None¶ Initialization method.
Parameters: params – Contains key-value parameters to the meta-heuristics.
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velocity
¶ Array of velocities.
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compile
(space: opytimizer.core.space.Space) → None¶ Compiles additional information that is used by this optimizer.
Parameters: space – A Space object containing meta-information.
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_calculate_population
(n_agents: int, iteration: int, n_iterations: int) → Tuple[int, int, int]¶ Calculates the number of crows, cats and cuckoos.
Parameters: - n_agents – Number of agents.
- iteration – Current iteration.
- n_iterations – Maximum number of iterations.
Returns: The number of crows, cats and cuckoos.
Return type: (Tuple[int, int, int])
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_nesting_phase
(space: opytimizer.core.space.Space, n_crows: int)¶ Performs the nesting phase using the current number of crows.
Parameters: - space – Space containing agents and update-related information.
- n_crows – Number of crows.
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_parasitism_phase
(space: opytimizer.core.space.Space, n_crows: int, n_cuckoos: int, iteration: int, n_iterations: int)¶ Performs the parasitism phase using the current number of cuckoos.
Parameters: - space – Space containing agents and update-related information.
- n_crows – Number of crows.
- n_cuckoos – Number of cuckoos.
- iteration – Current iteration.
- n_iterations – Maximum number of iterations.
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_predation_phase
(space: opytimizer.core.space.Space, n_crows: int, n_cuckoos: int, n_cats: int, iteration: int, n_iterations: int) → None¶ Performs the predation phase using the current number of cats.
Parameters: - space – Space containing agents and update-related information.
- n_crows – Number of crows.
- n_cuckoos – Number of cuckoos.
- n_cats – Number of cats.
- iteration – Current iteration.
- n_iterations – Maximum number of iterations.
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update
(space: opytimizer.core.space.Space, iteration: int, n_iterations: int) → None¶ Wraps Parasitism-Predation Algorithm over all agents and variables.
Parameters: - space – Space containing agents and update-related information.
- iteration – Current iteration.
- n_iterations – Maximum number of iterations.
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