Postdoctoral fellow at @VectorInst. ML PhD at UBC. Mathematical and computational structures for ML. Geometric and algebraic methods.

Orlando Florida
Joined August 2020
#ICML2024 Can We Remove the Square-Root in Adaptive Methods? arxiv.org/abs/2402.03496 Root-free (RF) methods are better on CNNs and competitive on Transformers compared to root-based methods (AdamW) Removing the root makes matrix methods faster: Root-free Shampoo in BFloat16 /1
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I still remember the comparison between SGD and Adam a few years ago. Empirical results may not support that. So, wait and see just like the SGD vs Adam lesson.
Slow is Fast: Is Muon the end of Shampoo? kexue.fm/archives/11917 Orthogonal Slowest Descent — from a convex optimization convergence bound — washes away any Kronecker preconditioner's eigenvectors, leaving only eigenvalues to balance the gradient's spectrum — leads to Muon.
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On one hand, it is essential to tune baseline methods well on a model. On the other hand, it may be better to avoid using a model/architecture that has been modified and optimized for a single method for 1.5 years.
I just submitted a PR to modded-nanogpt with better hyperparams. With them, Muon can reach the target loss after 3250 steps instead of 3325. Always tune your baseline well when doing research. Weak baselines can make any idea look promising
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We will make Shampoo/SOAP, including KL-Shampoo/KL-SOAP, faster. Our goal is to match Muon's runtime while maintaining Shampoo/SOAP's strong per-step performance. Stay tuned for new updates.
KL Shampoo and KL SOAP outperform their non-KL counterparts by learning the preconditioners compositionally, so that each stage corrects what remains after the last. Available in HeavyBall 3.1.1, with major PSGD stability backports.
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also, short sided KL-Shampoo = short-sided Shampoo^2 = Muon
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Within an information-geometric framework, we reconnect Shampoo/SOAP with both classical quasi-Newton ideas and Gaussian whitening, and develop practical methods that naturally handle tensor-valued weights in language model pre-training. arxiv.org/abs/2509.03378 opt-ml workshop
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This work builds on my ICML 2019 paper (with @MarkSchmidtUBC and @EmtiyazKhan), extending a variational Bayes-based geometric framework to modern NN optimization. It can be used to design methods for Bayesian inference, numerical optimization, and gradient-free optimization.
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This work is a joint effort with Scott C. Lowe, @f_dangel, @runame_, Zikun Xu, and @RogerGrosse. Stay tuned for more updates coming soon.
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1/9 In practice, the Shampoo optimizer crucially relies on several heuristics. In our NeurIPS 2025 spotlight paper, we investigate the role of learning rate grafting and infrequent preconditioner updates in Shampoo by decomposing its preconditioner. arxiv.org/abs/2506.03595
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Huge thanks to my amazing collaborators. This project was led by @juhanbae along with @LinYorker and @RogerGrosse. Supported (indirectly) by @Anthropic, @NVIDIA, @VectorInst, @UofTCompSci/@UofTArtSci/@UofT
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Natural gradient descent: (steepest) gradient descent under a norm induced by the Fisher matrix yorkerlin.github.io/posts/20… Riemannian gradient descent (with geodesic retraction) : gradient descent in Riemannian normal coordinate
At Maximum Likelihood Estimator: Key property: observed Fisher information = Fisher information 2nd order Taylor expansion of likelihood: - likelihood curvature = Fisher information - radius of osculating circle=Variance of MLE for large sample size
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