class_docstr: Implements manual multi-process and distributed sharding (MMPDS).
class_docstr_tok: ["Implements","manual","multi-process","and","distributed","sharding","(","MMPDS",")","."]
code: def text_to_instance(self, index: int):  # type: ignore
      return Instance({"index": LabelField(index, skip_indexing=True)})
  
imports: from itertools import islice
  from typing import Optional, List, Set
  import pytest
  import torch.distributed
  from allennlp.common import util
  from allennlp.data import Instance
  from allennlp.data.dataset_readers import DatasetReader, WorkerInfo
  from allennlp.data.fields import LabelField
label_desc: Use image node_id 3 for calling the MockMmpdsDatasetReader obj's underlying member method code with example usage: obj.text_to_instance(index) and returns: Instance