code: def _read(self, file_path: str) -> Iterable[Instance]:
      with open(file_path) as input_file:
          for line in input_file:
              yield self.text_to_instance(line)
  
imports: from typing import Iterable
  import pytest
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data.dataset_readers import DatasetReader, InterleavingDatasetReader
  from allennlp.data.data_loaders import MultiProcessDataLoader
  from allennlp.data.fields import TextField
  from allennlp.data.instance import Instance
  from allennlp.data.token_indexers import SingleIdTokenIndexer
  from allennlp.data.tokenizers import SpacyTokenizer
  from allennlp.data.vocabulary import Vocabulary
label_desc: Use image node_id 2 for calling the PlainTextReader obj's underlying member method code with example usage: obj._read(file_path) without return types