lebeg commented on issue #12477: [WIP] Added build with nccl URL: https://github.com/apache/incubator-mxnet/pull/12477#issuecomment-422369375 Another problem is the version of NCCL - the 1<sup>st</sup> version is [available on github](https://github.com/NVIDIA/nccl/releases) and we can integrate it easily to the CI. But the latest release links to CUDA 8.0 wich requires a separate docker build, since the usual builds are against 9.1 currently. The 2<sup>nd</sup> version is available only behind a registration: https://developer.nvidia.com/nccl
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