code: def test_validate_partition(self):
      try:
          self.cv._validate_partition([0, 0, 1, 1])
      except ValueError:
          assert True
  
      try:
          self.cv._validate_partition([0, 0, 1, 1, 2, 2, 2, 2, 3, 3])
      except ValueError:
          assert True
  
file_path: cornac/tests/cornac/eval_methods/test_cross_validation.py
imports: import unittest
  import numpy
  from cornac.eval_methods import CrossValidation
  from cornac.data import Reader
label_desc: Use image node_id 3 for calling the TestCrossValidation obj's underlying member method code with example usage: obj.test_validate_partition() without return types