PyTorch 2.15 makes rewritten NCCL backend default, speeds LLM decode on Apple and Blackwell
PyTorch 2.15 promotes a rewritten NCCL backend to default and accelerates LLM decoding across hardware stacks—from NVIDIA Blackwell to Apple Silicon. The release, spanning 3,117 commits from 583 contributors, also adds FP8 support on Apple, 4-bit
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