code: def test_draw_strokes_sframe(self):
      sf = self.stroke_sf
      sf["rendered"] = _tc.drawing_classifier.util.draw_strokes(
          sf[self.feature]
      )
      for index in range(len(sf["rendered"])):
          rendered = sf["rendered"][index]
          assert (
              type(rendered) == _tc.Image
              and rendered.channels == 1
              and rendered.width == 28
              and rendered.height == 28
          )
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import os
  import turicreate
  from turicreate.toolkits._main import ToolkitError
  import numpy
  import tempfile
  from array import array
  import sys
  from .None import util
  import unittest
label_desc: Use image node_id 27 for calling the DrawingClassifierTest obj's underlying member method code with example usage: obj.test_draw_strokes_sframe() without return types