code: def test_predict_invalid_threshold(self):
      with self.assertRaises(_ToolkitError):
          self.model.predict(self.sf.head(), confidence_threshold=-1)
      with self.assertRaises(_ToolkitError):
          self.model.predict(self.sf.head(), iou_threshold=-1)
  
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 22 for calling the ObjectDetectorTest obj's underlying member method code with example usage: obj.test_predict_invalid_threshold() without return types