Progressive Depth + Hedge Mixer — val_bpb 1.1454#856

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iverbovoy wants to merge 11 commits intoopenai:mainfrom

iverbovoy:hedge-mixer

Commits on Mar 21, 2026

Add SWA, Muon WD, fix quantization clamp
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Commits on Mar 25, 2026

Add XSA, LeakyReLU², GPTQ-lite, zstd-22 — val_bpb 1.2070
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Add submission: Depth Recurrence + XSA + LeakyReLU² (val_bpb 1.2065)
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