Add PCCL-based DDP communication hook#4
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The warmup learning rate calculation has been modified to use (it + 1)/(warmup_iters + 1) instead of it/warmup_iters. This ensures a non-zero learning rate at iteration 0 while maintaining the same linear warmup behavior. Fixes karpathy#443
…37-fix-warmup-lr fix: ensure non-zero learning rate during warmup at iteration 0
…rontier scaling support
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