text: Title: paddlehub-系统找不到指定的文件
  Body: - 版本、环境信息
  1）paddlehub==2.2.0,paddlepaddle==2.3.0
  2）win10系统，python3.8.5
  
  在命令窗口输入hub，hub config，hub install deeplabv3p_xception65_humanseg==1.1.2，等命令，都会提示如下。
  
  > Traceback (most recent call last):
    File "c:\users\yi\appdata\local\programs\python\python38\lib\runpy.py", line 194, in _run_module_as_main
      return _run_code(code, main_globals, None,
    File "c:\users\yi\appdata\local\programs\python\python38\lib\runpy.py", line 87, in _run_code
      exec(code, run_globals)
    File "C:\Users\YI\AppData\Local\Programs\Python\Python38\Scripts\hub.exe\__main__.py", line 4, in <module>
    File "c:\users\yi\appdata\local\programs\python\python38\lib\site-packages\paddlehub\__init__.py", line 18, in <module>
      import paddle
    File "c:\users\yi\appdata\local\programs\python\python38\lib\site-packages\paddle\__init__.py", line 71, in <module>
      import paddle.dataset  # noqa: F401
    File "c:\users\yi\appdata\local\programs\python\python38\lib\site-packages\paddle\dataset\__init__.py", line 27, in <module>
      import paddle.dataset.flowers  # noqa: F401
    File "c:\users\yi\appdata\local\programs\python\python38\lib\site-packages\paddle\dataset\flowers.py", line 39, in <module>
      from paddle.dataset.image import load_image_bytes
    File "c:\users\yi\appdata\local\programs\python\python38\lib\site-packages\paddle\dataset\image.py", line 48, in <module>
      import_cv2_proc = subprocess.Popen(
    File "c:\users\yi\appdata\local\programs\python\python38\lib\subprocess.py", line 854, in __init__
      self._execute_child(args, executable, preexec_fn, close_fds,
    File "c:\users\yi\appdata\local\programs\python\python38\lib\subprocess.py", line 1307, in _execute_child
      hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
  FileNotFoundError: [WinError 2] 系统找不到指定的文件。
  
  是安装不成功吗？有尝试过卸载重新部署。