class_docstr: Use to replace `InputChoice` Mutable in fix process
  
  Parameters
  ----------
  mask : list
      The mask indicating which input to choose
code: def __init__(self, mask):
      self.mask_len = len(mask)
      for i in range(self.mask_len):
          if mask[i]:
              self.selected = i
              break
      super().__init__()
  
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 1 to create a new FixedInputChoice object from inherited base classes: nn with example: obj = FixedInputChoice(mask)