code: def ordered_indices(self):
      return np.arange(self.num_items)
  
file_path: fairseq/fairseq/benchmark/dummy_dataset.py
imports: import numpy
  from fairseq.data import FairseqDataset
label_desc: Use image node_id 8 for calling the DummyDataset obj's underlying member method code with example usage: obj.ordered_indices() and returns: np