nccd

#nccd

I spent months inside verl (an RL post-training framework), forked it, then stopped. Wrote up the internals, the tooling a fork costs, and a nasty NCCL bug.

Reddit r/LocalLLaMA ↗ · 2d ago

A deep dive into the internals of ByteDance's verl RL post-training framework, including orchestration, single-controller pattern, and a tricky NCCL bug fix. The author shares lessons from forking the framework and building custom tooling.

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nccd

I spent months inside verl (an RL post-training framework), forked it, then stopped. Wrote up the internals, the tooling a fork costs, and a nasty NCCL bug.

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