code: def build_iter(self, epoch: int, shuffle: bool = None):
      return range(3)
  
imports: import pytest
  from espnet2.iterators.abs_iter_factory import AbsIterFactory
  from espnet2.iterators.multiple_iter_factory import MultipleIterFactory
label_desc: Use image node_id 1 for calling the IterFactory obj's underlying member method code with example usage: obj.build_iter(epoch, shuffle) and returns: range