code: def fingerprint(instance: Instance) -> Tuple[str, ...]:
      """
      Get a hashable representation of a sequence tagging instance
      that can be put in a Counter.
      """
      text_tuple = tuple(t.text for t in instance.fields["tokens"].tokens)  # type: ignore
      labels_tuple = tuple(instance.fields["tags"].labels)  # type: ignore
      return text_tuple + labels_tuple
  
file_path: allennlp/tests/data/dataset_readers/sharded_dataset_reader_test.py
imports: import glob
  import os
  import tarfile
  from collections import Counter
  from typing import Tuple
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data.data_loaders import MultiProcessDataLoader
  from allennlp.data.dataset_readers import SequenceTaggingDatasetReader, ShardedDatasetReader
  from allennlp.data.instance import Instance
label_desc: Use image node_id 1 for calling a global function with example usage: fingerprint(instance) and returns: unknown