code: def data_type(request):
      """Returns an in-memory DataIndexer instance with example data."""
      return request.param
  
file_path: AmpliGraph/tests/ampligraph/datasets/test_data_indexer.py
imports: from ampligraph.datasets.data_indexer import DataIndexer
  import numpy
  import pytest
label_desc: Use image node_id 2 for calling a global function with example usage: data_type(request) and returns: request