[CUDA][NCCL] group split - #3172
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nastya236
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February 25, 2026 17:19
nastya236
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February 25, 2026 17:28
nastya236
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February 25, 2026 21:59
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Add group split to NCCL backend for multi-parallelism support.
Refactored communicator creation by introducing a dedicated helper struct. It is probably not very important but I also updated the communicator storage from a raw pointer to a shared one for better ownership management.