code: def data_source(request):
      return request.param
  
file_path: AmpliGraph/tests/ampligraph/datasets/test_graph_data_loader.py
imports: from ampligraph.datasets import GraphDataLoader, NoBackend
  from ampligraph.datasets.sqlite_adapter import SQLiteAdapter
  import pytest
  import numpy
  import pandas
label_desc: Use image node_id 1 for calling a global function with example usage: data_source(request) and returns: request