code: def test_get_image(self):
      image_set = ImageSet.read(
          self.image_path, resize_height=128, resize_width=128
      )
      image = image_set.get_image()
  
      image_set = ImageSet.read(self.image_path)
      image = image_set.get_image()
      assert image[0].shape[0] is 3
  
      image_set = ImageSet.read(self.image_path, self.sc)
      image = image_set.get_image().collect()
      assert image[0].shape[0] is 3
  
      image_set = ImageSet.read(self.grayimage_path)
      image = image_set.get_image()
      assert image[0].shape[0] is 1
  
      image_set = ImageSet.read(self.grayimage_path, self.sc)
      image = image_set.get_image().collect()
      assert image[0].shape[0] is 1
  
imports: import pytest
  import cv2
  from bigdl.dllib.nncontext import *
  from bigdl.dllib.feature.image import *
label_desc: Use image node_id 4 for calling the Test_Image_Set obj's underlying member method code with example usage: obj.test_get_image() without return types