class_docstr: Helper class storing map keys and auxilary info for use in MapData
class_docstr_tok: ["Helper","class","storing","map","keys","and","auxilary","info","for","use","in","MapData"]
code: def __init__(
      self,
      key: str,
      default_value: T,
  ) -> None:
      self._key = key
      self._default_value = default_value
  
imports: from __future__ import annotations
  from logging import Logger
  from typing import Any, Dict, Generic, Iterable, List, Optional, Sequence, Type, TypeVar
  import numpy
  import pandas
  from ax.core.data import Data
  from ax.core.types import TMapTrialEvaluation
  from ax.exceptions.core import UnsupportedError
  from ax.utils.common.base import SortableBase
  from ax.utils.common.docutils import copy_doc
  from ax.utils.common.equality import dataframe_equals
  from ax.utils.common.logger import get_logger
  from ax.utils.common.serialization import serialize_init_args, TClassDecoderRegistry, TDecoderRegistry
  from ax.utils.common.typeutils import checked_cast
label_desc: Use image node_id 1 to create a new MapKeyInfo object from inherited base classes: Generic, SortableBase with example: obj = MapKeyInfo(key, default_value)