TL/NCCL: lazy init nccl comm #851
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* TL/NCCL: lazy init nccl comm * REVIEW: fix review comments
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What
Lazily initialize TL NCCL on first CUDA collective.
Why ?
Both NCCL and CUDA require CUDA devices to be set before team create. In MPI workloads it's not always possible since MPI_Init creates UCC team and to set device we need to know rank and local rank.
replaces #758