class_docstr: Base class of a step decoder
  
  You may inherit `BaseStepDecoder` and implement the required methods.
class_docstr_tok: ["Base","class","of","a","step","decoder","You","may","inherit","`","BaseStepDecoder","`","and","implement","the","required","methods","."]
code: def data_batch_axis(self):
      return 0
  
imports: import warnings
  import mxnet
  import abc
  from mxnet.gluon import HybridBlock
  from typing import Callable, Optional
  from .layers import get_activation
label_desc: Use image node_id 2 for calling the BaseStepDecoder obj's underlying member method code with example usage: obj.data_batch_axis() and returns: int