code: def _init_transformers_backbone(self, config) -> None:
      stage_names = getattr(config, "stage_names")
      out_features = getattr(config, "out_features", None)
      out_indices = getattr(config, "out_indices", None)
  
      self.stage_names = stage_names
      (
          self._out_features,
          self._out_indices,
      ) = get_aligned_output_features_output_indices(
          out_features=out_features,
          out_indices=out_indices,
          stage_names=stage_names,
      )
      # Number of channels for each stage. This is set in the transformer backbone model init
      self.num_features = None
  
imports: import enum
  import inspect
  from typing import Iterable, List, Optional, Tuple, Union
label_desc: Use image node_id 2 for calling the BackboneMixin obj's underlying member method code with example usage: obj._init_transformers_backbone(config) without return types