code: def test_predict_rank(self):
      pred_scores = self.clf.decision_function(self.X_test)
      pred_ranks = self.clf._predict_rank(self.X_test)
      print(pred_ranks)
  
      # assert the order is reserved
      assert_allclose(
          rankdata(pred_ranks), rankdata(pred_scores), atol=2
      )
      assert_array_less(pred_ranks, self.X_train.shape[0] + 1)
      assert_array_less(-0.1, pred_ranks)
  
imports: from __future__ import division
  from __future__ import print_function
  import os
  import sys
  import unittest
  import numpy
  from numpy.testing import *
  from numpy.testing import assert_array_less
  from numpy.testing import assert_equal
  from numpy.testing import assert_raises
  from sklearn.base import clone
  from scipy.stats import rankdata
  from pyod.models.rod import ROD, rod_3D, rod_nD, angle, sigmoid, process_sub, mad
  from pyod.utils.data import generate_data
label_desc: Use image node_id 11 for calling the TestROD obj's underlying member method code with example usage: obj.test_predict_rank() without return types