code: def test_is_distributed(self):
      image_frame = ImageFrame.read(self.image_path)
      assert image_frame.is_distributed() is False
      image_frame = ImageFrame.read(self.image_path, self.sc)
      assert image_frame.is_distributed() is True
  
imports: import pytest
  import os
  from bigdl.dllib.utils.common import *
  from bigdl.dllib.feature.transform.vision.image import *
  import tempfile
label_desc: Use image node_id 8 for calling the TestLayer obj's underlying member method code with example usage: obj.test_is_distributed() without return types