code: def required_data_names(cls, train=True, inference=False):
      if not inference:
          retval = ("x",)
      else:
          # Recognition mode
          retval = ("x",)
      return retval
  
imports: import configargparse
  import pytest
  import torch
  from espnet2.tasks.abs_task import AbsTask
  from espnet2.torch_utils.device_funcs import force_gatherable
  from espnet2.train.abs_espnet_model import AbsESPnetModel
  from espnet2.train.collate_fn import CommonCollateFn
label_desc: Use image node_id 4 for calling the TestTask obj's underlying member method code with example usage: obj.required_data_names(cls, train, inference) and returns: retval