code: def source_identifier(request, data_source):
      """Returns a SourceIdentifier instance."""
      src_identifier = DataSourceIdentifier(data_source)
      yield src_identifier, data_source
  
file_path: AmpliGraph/tests/ampligraph/datasets/test_source_identifier.py
imports: import numpy
  import pytest
  import pandas
  from ampligraph.datasets import load_csv, chunks
  from ampligraph.datasets.source_identifier import DataSourceIdentifier
  import os
label_desc: Use image node_id 4 for calling a global function with example usage: source_identifier(request, data_source) without return types