smac.facade.multi_fidelity_facade

Classes

MultiFidelityFacade(scenario, target_function, *)

This facade configures SMAC in a multi-fidelity setting.

Interfaces

class smac.facade.multi_fidelity_facade.MultiFidelityFacade(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: HyperparameterOptimizationFacade

This facade configures SMAC in a multi-fidelity setting.

static get_initial_design(scenario, *, n_configs=None, n_configs_per_hyperparamter=10, max_ratio=0.25, additional_configs=None)[source]

Returns a random initial design.

Parameters:

  • scenario (Scenario)

  • n_configs (int | None, defaults to None) – Number of initial configurations (disables the arguments n_configs_per_hyperparameter).

  • n_configs_per_hyperparameter (int, defaults to 10) – Number of initial configurations per hyperparameter. For example, if my configuration space covers five hyperparameters and n_configs_per_hyperparameter is set to 10, then 50 initial configurations will be samples.

  • max_ratio (float, defaults to 0.25) – Use at most scenario.n_trials * max_ratio number of configurations in the initial design. Additional configurations are not affected by this parameter.

  • additional_configs (list[Configuration], defaults to []) – Adds additional configurations to the initial design.

Return type:

RandomInitialDesign

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:

Hyperband

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”: Shuffles 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., the best performance regardless of budget. * “highest_observed_budget”: Incumbent is the best in the highest budget run so far. refer to runhistory.get_trials for more details. Crucially, if true, then a for a given config-instance-seed, only the highest (so far executed) budget is used for comparison against the incumbent. Notice, that if the highest observed budget is smaller than the highest budget of the incumbent, the configuration will be queued again to be intensified again. * “highest_budget”: Incumbent is selected only based on the absolute highest budget available only.

max_incumbentsint, defaults to 10

How many incumbents to keep track of in the case of multi-objective.

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