code: def test_empty_result_invalid_call(self):
      num_labels = 3
      multi_label_args = [True, False]
      for multi_label in multi_label_args:
          with self.assertRaisesRegex(
              ValueError, "Invalid usage: At least one of"
          ):
              empty_result(
                  multi_label,
                  num_labels,
                  return_prediction=False,
                  return_proba=False,
              )
  
file_path: small-text/tests/unit/small_text/utils/test_classification.py
imports: import unittest
  import numpy
  from numpy.testing import assert_array_equal
  from scipy.sparse import csr_matrix
  from sklearn.preprocessing import MultiLabelBinarizer
  from small_text.utils.classification import empty_result, prediction_result
  from tests.utils.testing import assert_csr_matrix_equal
label_desc: Use image node_id 10 for calling the ClassificationUtilsTest obj's underlying member method code with example usage: obj.test_empty_result_invalid_call() without return types