https://github.com/horovod/horovod/blob/master/docs/contributors.rst

如何在Linux或Ubuntu18下安装virtualenv https://developer.aliyun.com/article/613957

https://docs.nvidia.com/deeplearning/nccl/install-guide/index.html#tar

horovod with nccl hang all the time https://github.com/NVIDIA/nccl/issues/224

http://mp.weixin.qq.com/s?src=3&timestamp=1490584889&ver=1&signature=9wHB5GdbjfflecgbOlZ3Qlq4w0sEKIDOVHDUnbshUR9qGnThhVPtfmSkPVSTihutin5elwHvRWvDnJFfd-883A63I36wdvbeUQVo7eXM4u8ESZXENoPDh7-WpwDu-jHVxo1g*j6bv6Mwl4k8S9dAI5cSo3hAnm3cnAMyywBZHDg=

http://mp.weixin.qq.com/s?src=3&timestamp=1490583598&ver=1&signature=9wHB5GdbjfflecgbOlZ3Qlq4w0sEKIDOVHDUnbshUR8KsnQxXpbd5LA1BS5KxHXNeu-0VDpvxZo36srm6vBTqCuoLHNIxbN3sSuld8OSgqIRL7GkQOJ1rkW81MQjDBfeNB3eKf7tnH3QBhtYCHnM1Ebv47lT2JjXcrbGnNWX3s4=