optimizers · google

Lion

EvoLved Sign Momentum. Tracks only momentum and updates with the sign function. Half the optimizer-state memory of Adam.

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What this registry has checked

Quarantine. We hold the publisher’s own published hash for these weights and have recorded it against this entry. We have not downloaded and hashed the weights ourselves, so the hash is the publisher’s claim, not our measurement.

Weight file SHA-256	6252cca0b0904cc68ca7ac111cd32549087ee5835564a9bf83505c812ac5c661

Re-check this yourself → Source → Full record →

What is recorded

Publisher	google
Origin	United States
Licence	Apache-2.0
Pulls recorded here	24,003

Elsewhere in the registry

All optimizers → Browse with filters → What will run on my hardware? →

Registry record as of 2026-06-06. Identity, licence and parameter count are properties of a release and do not move; tier can, and the verify link above re-checks it against the live registry rather than this page.