class_docstr: Base space class of NAS module. Defining space containing all models.
  Please use mutables to define your whole space. Refer to
  `https://nni.readthedocs.io/en/stable/NAS/WriteSearchSpace.html`
  for detailed information.
  
  Parameters
  ----------
  init: bool
      Whether to initialize the whole space. Default: `False`
docstr: Instantiate the space, reset default key for the mutables here/
docstr_tok: ["Instantiate","the","space",",","reset","default","key","for","the","mutables","here\/"]
code: def instantiate(self):
      """
      Instantiate the space, reset default key for the mutables here/
      """
      self._default_key = 0
      if not self._initialized:
          self._initialized = True
  
imports: from abc import abstractmethod
  import torch.nn
  from nni.nas.pytorch import mutables
  from nni.nas.pytorch.fixed import FixedArchitecture
  import json
  from copy import deepcopy
  import torch
  from ...model import BaseAutoModel
  from ....utils import get_logger
  from ..utils import get_hardware_aware_metric
label_desc: Use image node_id 5 for calling the BaseSpace obj's underlying member method code with example usage: obj.instantiate() without return types