code: def test_video_stream_segment2(self):
      (
          img_matting,
          cur_gray,
          optflow_map,
      ) = self.module.video_stream_segment(
          frame_org=cv2.imread("tests/test.jpg"),
          frame_id=1,
          prev_gray=None,
          prev_cfd=None,
          use_gpu=True,
      )
      self.assertIsInstance(img_matting, np.ndarray)
      self.assertIsInstance(cur_gray, np.ndarray)
      self.assertIsInstance(optflow_map, np.ndarray)
      (
          img_matting,
          cur_gray,
          optflow_map,
      ) = self.module.video_stream_segment(
          frame_org=cv2.imread("tests/test.jpg"),
          frame_id=2,
          prev_gray=cur_gray,
          prev_cfd=optflow_map,
          use_gpu=True,
      )
      self.assertIsInstance(img_matting, np.ndarray)
      self.assertIsInstance(cur_gray, np.ndarray)
      self.assertIsInstance(optflow_map, np.ndarray)
  
imports: import os
  import shutil
  import unittest
  import cv2
  import numpy
  import requests
  import paddlehub
label_desc: Use image node_id 10 for calling the TestHubModule obj's underlying member method code with example usage: obj.test_video_stream_segment2() without return types