class_docstr: A dictionary with numeric keys that looks up the closest key.
code: def __init__(self, *args: Any, **kwargs: Any) -> None:
      super().__init__(*args, **kwargs)
      # pyre-fixme[4]: Attribute must be annotated.
      self._keys = sorted(self.keys())
  
imports: from __future__ import annotations
  from collections import defaultdict
  from math import isnan
  from numbers import Number
  from typing import Any, Callable, Dict, List, Optional, Tuple, TYPE_CHECKING, Union
  import numpy
  from ax.core.observation import Observation, ObservationData, ObservationFeatures
  from ax.core.optimization_config import OptimizationConfig
  from ax.core.parameter import Parameter
  from ax.core.parameter_constraint import ParameterConstraint
  from ax.core.search_space import RobustSearchSpace, SearchSpace
  from ax.modelbridge.transforms.derelativize import Derelativize
  from scipy.stats import norm
label_desc: Use image node_id 1 to create a new ClosestLookupDict object from inherited base classes: dict with example: obj = ClosestLookupDict()