docstr: Check the predict() function.
docstr_tok: ["Check","the","predict","(",")","function","."]
code: def test_predict(self):
      """
      Check the predict() function.
      """
      model = self.model
      for output_type in ["probability_vector", "class"]:
          preds = model.predict(
              self.data,
              output_type=output_type,
              output_frequency="per_window",
          )
          expected_len = self._calc_expected_predictions_length(
              self.data
          )
          self.assertEqual(len(preds), expected_len)
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import turicreate
  import random
  import tempfile
  import math
  import numpy
  from numbers import Number
  from .None import util
  import pytest
  from turicreate.toolkits._internal_utils import _mac_ver
  from turicreate.toolkits._main import ToolkitError
  import uuid
label_desc: Use image node_id 3 for calling the ActivityClassifierTest obj's underlying member method code with example usage: obj.test_predict() without return types