code: def test_graphsage():
      # Test only PPI because Travis otherwise runs into memory errors
      dataset = datasets.PPI()
      _ = SingleLoader(dataset)
  
file_path: spektral/tests/test_datasets.py
imports: from spektral import datasets
  from spektral.data import BatchLoader, DisjointLoader, SingleLoader
label_desc: Use image node_id 4 for calling a global function with example usage: test_graphsage() without return types