Researchers spot online PCA cost equals KL-shampoo objective in optimizer discussion
_arohan_ · x · 2026-09-01
@YouJiacheng observes that the online PCA cost in appendix H.3 of a paper is exactly the KL objective in KL-shampoo, though the original didn't frame it as a KL divergence, and asks whether this cost is known in online PCA literature. @HessianFree says these formulations were sketched on a whiteboard with Xilin years ago, with more variants never written down, and they may help when gradients are noisy or low-rank.
Related event: PSGD Objective Found Mathematically Equivalent to KL-Shampoo(6 posts)→
More from Research
- Transforming quadruped robot runs on real hardware: per-pose RL policies in Isaac switched on morph — _Stocko_ · 2026-10-16
- KinoGen synthesizes robot loco-manipulation reference motions directly via kinematically grounded video generation — ChongZzZhang · 2026-10-16
- Science Robotics paper introduces F³, predictive event-based vision beyond optical flow — CSProfKGD · 2026-10-16
- VideoGen-Agent: An 8B Multimodal Agent Turns Video Generation Into a Tool-Use Loop — jiqizhixin · 2026-10-16
- Comprehension Audits: New Paper Proposes a Gate for AI-Written Code at Frontier Labs — ronbodkin · 2026-10-16
- Not Boring #215: Cammarata's Clean Networks Claim, Tesla's Flying Roadster, Tau Cut 73% — Not Boring (Packy McCormick) · 2026-10-16