code: def get_indices_concattask(self, task):
      raise NotImplementedError(
          "Method `get_indices_concattask` must be "
          "implemented in classes inherited from `Splitter`."
      )
  
imports: import torch
  import numpy
  from collections import OrderedDict, defaultdict
  from torchmeta.utils.data.task import Task, ConcatTask, SubsetTask
  from torchmeta.transforms.utils import apply_wrapper
label_desc: Use image node_id 5 for calling the Splitter obj's underlying member method code with example usage: obj.get_indices_concattask(task) without return types