code: def _pathway_name(self, pathway_idx):
      return "pathway{}".format(pathway_idx)
  
file_path: ClassyVision/classy_vision/models/resnext3d_stage.py
imports: from collections import OrderedDict
  import torch.nn
  from .resnext3d_block import ResBlock
label_desc: Use image node_id 3 for calling the ResStageBase obj's underlying member method code with example usage: obj._pathway_name(pathway_idx) and returns: str