code: def test_parameters(self):
      assert (
          hasattr(self.clf, "decision_scores_")
          and self.clf.decision_scores_ is not None
      )
      assert (
          hasattr(self.clf, "labels_") and self.clf.labels_ is not None
      )
      assert (
          hasattr(self.clf, "threshold_")
          and self.clf.threshold_ is not None
      )
      assert (
          hasattr(self.clf, "n_neighbors_")
          and self.clf.n_neighbors_ is not None
      )
  
imports: from __future__ import division
  from __future__ import print_function
  import os
  import sys
  import unittest
  from numpy.testing import assert_allclose
  from numpy.testing import assert_array_less
  from numpy.testing import assert_equal
  from numpy.testing import assert_raises
  from scipy.stats import rankdata
  from sklearn.base import clone
  from sklearn.metrics import roc_auc_score
  from pyod.models.cof import COF
  from pyod.utils.data import generate_data
label_desc: Use image node_id 2 for calling the TestMemoryCOF obj's underlying member method code with example usage: obj.test_parameters() without return types