code: def test_unlabelled():
      current_dir = os.path.dirname(os.path.abspath(__file__))
      input_file = os.path.join(
          current_dir, "../../data/tests/no_labels.csv"
      )
      featurizer = dc.feat.CircularFingerprint(size=1024)
      loader = dc.data.CSVLoader(
          tasks=[], feature_field="smiles", featurizer=featurizer
      )
      dataset = loader.create_dataset(input_file)
      assert len(dataset.X)
  
file_path: deepchem/deepchem/data/tests/test_data_loader.py
imports: import os
  import tempfile
  import shutil
  import deepchem
label_desc: Use image node_id 1 for calling a global function with example usage: test_unlabelled() without return types