requires TensorFlow library but it was not found

执行：
```pip install --upgrade tensorflow==2.13.0

已经成功。

但是执行：

portrait_matting = pipeline('portrait-matting')
result = portrait_matting('https://modelscope.oss-cn-beijing.aliyuncs.com/test/images/image_matting.png')
cv2.imwrite('result.png', result['output_img'])

```
时，报告如下错误：
modelscope.pipelines.cv.image_matting_pipeline requires the TensorFlow library but it was not found in your environment. ...

请问问题出在哪里？应该安装 tensorflow 哪个版本？（我没有GPU）