code: def __len__(self):
      return len(self.batches)
  
file_path: espnet/espnet2/iterators/sequence_iter_factory.py
imports: import itertools
  import random
  from functools import partial
  from typing import Any, Sequence, Union
  import numpy
  from torch.utils.data import DataLoader
  from typeguard import check_argument_types
  from espnet2.iterators.abs_iter_factory import AbsIterFactory
  from espnet2.samplers.abs_sampler import AbsSampler
label_desc: Use image node_id 2 for calling the RawSampler obj's underlying member method code with example usage: obj.__len__() and returns: len