code: def test_predict(self):
      sf = self.test.head()
      pred = self.model.predict(sf.head())
  
      # Check the structure of the output
      _raise_error_if_not_sarray(pred)
      self.assertEqual(len(pred), len(sf))
  
      # Make sure SFrame was not altered
      self.assertEqual(
          [col for col in sf.column_names() if col.startswith("_")], []
      )
  
      # Predict should work on no input (and produce no predictions)
      pred0 = self.model.predict(sf[self.feature][:0])
      self.assertEqual(len(pred0), 0)
  
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
label_desc: Use image node_id 9 for calling the OneObjectDetectorSmokeTest obj's underlying member method code with example usage: obj.test_predict() without return types