Source code for smac.runhistory.encoder.log_encoder

from __future__ import annotations

import numpy as np

from smac import constants
from smac.runhistory.encoder.encoder import RunHistoryEncoder
from smac.utils.logging import get_logger

__copyright__ = "Copyright 2022, automl.org"
__license__ = "3-clause BSD"


logger = get_logger(__name__)


[docs]class RunHistoryLogEncoder(RunHistoryEncoder):
[docs] def transform_response_values(self, values: np.ndarray) -> np.ndarray: """Transforms the response values by using log.""" # ensure that minimal value is larger than 0 if np.any(values <= 0): logger.warning( "Got cost of smaller/equal to 0. Replace by %f since we use" " log cost." % constants.MINIMAL_COST_FOR_LOG ) values[values < constants.MINIMAL_COST_FOR_LOG] = constants.MINIMAL_COST_FOR_LOG return np.log(values)