Hydra-SMAC 0.1.11

A minimal Python re-implementation of Hydra.

Getting started

pip install hydra-smac

Example

For more information on how to use Scenario objects, please refer to the SMAC documentation.

from ConfigSpace import Configuration, ConfigurationSpace, Float
from hydrasmac import Hydra
from smac import Scenario

instances = ["a", "b", "c"]
features = {"a": [0.0], "b": [1.0], "c": [2.0]}

cs = ConfigurationSpace()
cs.add_hyperparameters(
    [
        Float("x", (1.0, 5.0)),
        Float("y", (1.0, 5.0)),
        Float("z", (1.0, 5.0)),
    ]
)


def target_function(config: Configuration, instance: str, seed: int = 0) -> float:
    config_dict = config.get_dictionary()
    x, y, z = config_dict["x"], config_dict["y"], config_dict["z"]

    if instance == "a" and x < 2.5 and y > 2.5 and z > 2.5:
        return 0.001

    if instance == "b" and y < 2.5 and x > 2.5 and z > 2.5:
        return 0.01

    if instance == "c" and z < 2.5 and y > 2.5 and x > 2.5:
        return 0.1

    return 1


scenario = Scenario(
    configspace=cs,
    instances=instances,
    instance_features=features,
    n_trials=500,
)

hydra = Hydra(
    scenario,
    target_function,
    hydra_iterations=3,
    smac_runs_per_iter=1,
    incumbents_added_per_iter=1,
    stop_early=True,
)

portfolio = hydra.optimize()
print("====== Resulting portfolio ======")
print(portfolio)
print("=================================")