smac.facade.hyperband_facade¶
Classes¶
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Facade to use model-free Hyperband [LJDR18] for algorithm configuration. |
Interfaces¶
- class smac.facade.hyperband_facade.HyperbandFacade(scenario, target_function, *, model=None, acquisition_function=None, acquisition_maximizer=None, initial_design=None, random_design=None, intensifier=None, multi_objective_algorithm=None, runhistory_encoder=None, config_selector=None, logging_level=None, callbacks=None, overwrite=False, dask_client=None)[source]¶
Bases:
RandomFacadeFacade to use model-free Hyperband [LJDR18] for algorithm configuration.
Uses Random Aggressive Online Racing (ROAR) to compare configurations, a random initial design and the Hyperband intensifier.
- static get_intensifier(scenario, *, eta=3, n_seeds=1, instance_seed_order='shuffle_once', max_incumbents=10, incumbent_selection='highest_observed_budget')[source]¶
Returns a Hyperband intensifier instance. Budgets are supported.
- Return type:
- etaint, defaults to 3
Input that controls the proportion of configurations discarded in each round of Successive Halving.
- n_seedsint, defaults to 1
How many seeds to use for each instance.
- instance_seed_orderstr, defaults to “shuffle_once”
How to order the instance-seed pairs. Can be set to: * None: No shuffling at all and use the instance-seed order provided by the user. * “shuffle_once”: Shuffle the instance-seed keys once and use the same order across all runs. * “shuffle”: Shuffle the instance-seed keys for each bracket individually.
- incumbent_selectionstr, defaults to “any_budget”
How to select the incumbent when using budgets. Can be set to: * “any_budget”: Incumbent is the best on any budget i.e., best performance regardless of budget. * “highest_observed_budget”: Incumbent is the best in the highest budget run so far. * “highest_budget”: Incumbent is selected only based on the highest budget.
- max_incumbentsint, defaults to 10
How many incumbents to keep track of in the case of multi-objective.