Source code for ax.modelbridge.transforms.int_range_to_choice

#!/usr/bin/env python3
# Copyright (c) Facebook, Inc. and its affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.

from typing import TYPE_CHECKING, Dict, List, Optional, Set

from ax.core.observation import ObservationData, ObservationFeatures
from ax.core.parameter import ChoiceParameter, Parameter, ParameterType, RangeParameter
from ax.core.search_space import SearchSpace
from ax.core.types import TConfig
from ax.modelbridge.transforms.base import Transform

if TYPE_CHECKING:
    # import as module to make sphinx-autodoc-typehints happy
    from ax import modelbridge as modelbridge_module  # noqa F401  # pragma: no cover


[docs]class IntRangeToChoice(Transform): """Convert a RangeParameter of type int to a ordered ChoiceParameter. Transform is done in-place. """ def __init__( self, search_space: SearchSpace, observation_features: List[ObservationFeatures], observation_data: List[ObservationData], modelbridge: Optional["modelbridge_module.base.ModelBridge"] = None, config: Optional[TConfig] = None, ) -> None: # Identify parameters that should be transformed self.transform_parameters: Set[str] = { p_name for p_name, p in search_space.parameters.items() if isinstance(p, RangeParameter) and p.parameter_type == ParameterType.INT }
[docs] def transform_search_space(self, search_space: SearchSpace) -> SearchSpace: transformed_parameters: Dict[str, Parameter] = {} for p_name, p in search_space.parameters.items(): if p_name in self.transform_parameters and isinstance(p, RangeParameter): # pyre-fixme[6]: Expected `int` for 1st param but got `float`. values = list(range(p.lower, p.upper + 1)) target_value = ( None if p.target_value is None else next(i for i, v in enumerate(values) if v == p.target_value) ) transformed_parameters[p_name] = ChoiceParameter( name=p_name, parameter_type=p.parameter_type, # Expected `List[Optional[typing.Union[bool, float, str]]]` for # 4th parameter `values` to call # `ax.core.parameter.ChoiceParameter.__init__` but got # `List[int]`. # pyre-fixme[6]: values=values, is_ordered=True, is_fidelity=p.is_fidelity, target_value=target_value, ) else: transformed_parameters[p.name] = p return SearchSpace( parameters=list(transformed_parameters.values()), parameter_constraints=[ pc.clone_with_transformed_parameters( transformed_parameters=transformed_parameters ) for pc in search_space.parameter_constraints ], )