saealib.TruncationSelection

class saealib.TruncationSelection(randomize_ties=False)

ベースクラス: SurvivorSelection

Truncation selection operator.

パラメータ:

randomize_ties (bool)

randomize_ties

When True, individuals tied at the truncation boundary (equal under comparator.compare_population) are shuffled before truncating, matching pymoo's randomized_argsort treatment of the splitting front. When False (default), ties keep the order returned by comparator.rank_population (deterministic).

Type:

bool

Methods

__init__	Initialize truncation selection operator.
contract	Return the truncation-selection contract.
select	Select survivors by truncating the sorted pool.

Method Details

TruncationSelection.__init__(randomize_ties=False)

Initialize truncation selection operator.

パラメータ:

randomize_ties (bool, optional) -- Randomize the order of individuals tied at the truncation boundary, by default False.

TruncationSelection.contract()

Return the truncation-selection contract.

戻り値の型:

ComponentContract

TruncationSelection.select(ctx, pool, n_survivors)

Select survivors by truncating the sorted pool.

パラメータ:

• ctx (ExecutionContext) -- Optimization context.

• pool (Population) -- Selection pool to choose survivors from.

• n_survivors (int) -- Number of survivors to select.

戻り値:

Indices of selected survivors in the pool.

戻り値の型:

np.ndarray