sudo docker images显示所有镜像
我想删除上图红框中成对出现的两个镜像，用sudo docker rmi ID 的命令删除时，会出现一下错误：
Error response from daemon: conflict: unable to delete d54e119055f0 (cannot be forced) - image has dependent child images用以下方法删除成功了：
sudo docker rmi paddlepaddle/paddle:1.6.3-gpu-cuda10.0-cudnn7-hub
