code: def test_load_singleton_csv():
      fin = tempfile.NamedTemporaryFile(mode="w", delete=False)
      fin.write("smiles,endpoint\nc1ccccc1,1")
      fin.close()
      featurizer = dc.feat.CircularFingerprint(size=1024)
      tasks = ["endpoint"]
      loader = dc.data.CSVLoader(
          tasks=tasks, feature_field="smiles", featurizer=featurizer
      )
  
      X = loader.create_dataset(fin.name)
      assert len(X) == 1
      os.remove(fin.name)
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_load_singleton_csv() without return types