code: def test_extra_classes(self):
      # Create while the data has extra classes
      model = tc.object_detector.create(
          self.sf, classes=_CLASSES[:2], max_iterations=1
      )
      self.assertEqual(len(model.classes), 2)
  
      # Evaluate while the data has extra classes
      ret = model.evaluate(self.sf.head())
      self.assertEqual(len(ret["average_precision_50"]), 2)
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import pytest
  from .None import util
  import turicreate
  import tempfile
  import numpy
  import platform
  import pytest
  import sys
  import os
  from turicreate.toolkits._main import ToolkitError
  from turicreate.toolkits._internal_utils import _raise_error_if_not_sarray, _mac_ver
  from six import StringIO
label_desc: Use image node_id 14 for calling the ObjectDetectorTest obj's underlying member method code with example usage: obj.test_extra_classes() without return types