ribs.emitters.operators.IsoLineOperator¶

class ribs.emitters.operators.IsoLineOperator(iso_sigma: float | floating, line_sigma: float | floating, seed: int | integer | None = None)[source]¶

Adds Isotropic Gaussian noise and directional noise to parents.

This operator was introduced in Vassiliades 2018.

Parameters:¶

iso_sigma: float | floating¶: Scale factor for the isotropic distribution used to generate solutions.
line_sigma: float | floating¶: Scale factor for the line distribution used when generating solutions.
seed: int | integer | None = None¶: Value to seed the random number generator. Set to None to avoid a fixed seed.

Methods

`ask`(parents)	Adds Isotropic Guassian noise and directional noise to parents.

Attributes

`parent_type`	Parent Type to be used by selector.

ask(parents: numpy.typing.ArrayLike) → ndarray[source]¶

Adds Isotropic Guassian noise and directional noise to parents.

Parameters:¶

parents: numpy.typing.ArrayLike¶: (2, batch_size, solution_dim) parents[0] array of solutions selected by emitter parents[1] array of second batch of solutions passed by emitter. Used for calculating directional correlation.

Returns:¶

(batch_size, solution_dim) array that contains batch_size mutated solutions.