code: def _read(self, _):
      self.num_reads += 1
      return (instance for instance in self._instances)
  
file_path: magnitude/pymagnitude/third_party/allennlp/tests/data/dataset_readers/lazy_dataset_reader_test.py
imports: from __future__ import absolute_import
  from allennlp.data.fields import TextField
  from allennlp.data.instance import Instance
  from allennlp.data.dataset_readers import DatasetReader
  from allennlp.data.token_indexers import SingleIdTokenIndexer
  from allennlp.data.tokenizers import Token
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.common.util import ensure_list
label_desc: Use image node_id 2 for calling the LazyDatasetReader obj's underlying member method code with example usage: obj._read(_) and returns: unknown