ribs.emitters.rankers.ObjectiveRanker¶

class ribs.emitters.rankers.ObjectiveRanker(seed: int | integer | None = None)[source]¶

Ranks solutions based on objective values.

This ranker originates in the optimizing emitter in Fontaine 2020.

Methods

rank(emitter, archive, data, add_info)	Ranks the solutions based on their objective values.
reset(emitter, archive)	Resets the internal state of the ranker.

rank(emitter: EmitterBase, archive: ArchiveBase, data: dict[str, ndarray], add_info: dict[str, ndarray]) → tuple[ndarray, ndarray][source]¶

Ranks the solutions based on their objective values.

Parameters:¶

emitter: EmitterBase¶

Emitter that this ranker object belongs to.

archive: ArchiveBase¶

Archive used by emitter when creating and inserting solutions.

data: dict[str, ndarray]¶

Dict mapping from field names like solution and objective to arrays with data for the solutions.

add_info: dict[str, ndarray]¶

Information returned by an archive’s add() method.

Returns:¶

The first array (shape (batch_size,)) is an array of indices representing a ranking of the solutions and the second array (shape (batch_size,) or (batch_size, n_values)) is an array of values that this ranker used to rank the solutions. batch_size is the number of solutions and n_values is the number of values that the rank function used.

reset(emitter: EmitterBase, archive: ArchiveBase) → None¶

Resets the internal state of the ranker.

Parameters:¶

emitter: EmitterBase¶

Emitter that this ranker object belongs to.

archive: ArchiveBase¶

Archive used by emitter when creating and inserting solutions.