[wip] Distributed Scion/Muon #1630
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rakkit
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Thanks for the PR on cutting-edge features!
I didn't read the papers so please forgive me if what I comment doesn't make sense.
I guess for "core" changes such as this one on optimizers, the recommended path is to first land in pytorch/pytorch, and then expose minimal interfaces to torchtitan. torchtitan shouldn't be a place to host core features.
cc @janeyx99 on interesting optimizer work
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This is a distributed version of Scion or Modular Norm, muon is considered to be a variant of this by using explicit AdamW for LLM's embedding/output.
Works:
Missing
Need some extra work to adjust the EP changes for EP-[shard(1)] and ETP?
At the moment, we need a long configuration to initialize it, will fix later by passing the list
CC @janEbert @ofivite