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Author

Ryotaro Kawata

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#machine learning Preprint Oct 2026

Finite-Sample Approximation of Hessian-Guided Perturbed Wasserstein Gradient Flows

Wasserstein gradient flow extends gradient descent to probability measures. Its Hessian-guided perturbed variant (PWGF) adds Gaussian perturbations to escape saddle points in nonconvex problems. We investigate when its approximation by finitely many interacting particles remains accurate over growing time horizons. Our...

Ryotaro Kawata, Atsushi Nitanda, Taiji Suzuki · 0 citations
#machine learning Preprint Oct 2026

Diffusion Transformers are Provably Optimal In-context Generators

Generative foundation models are attracting interest for their ability to produce desired outputs from demonstrations given at inference time, without updating parameters. However, since a few demonstrations cannot uniquely identify the intended task, the challenge is how to learn and sample from an output distribution...

Guoji Fu, Tomoya Wakayama, Ryotaro Kawata et al. · 0 citations
#machine learning Preprint Sep 2026

Counterfactual Probing for Parallel Unmasking with Hidden Forest Structure

This work considers discrete distributions with hidden forest structure, accessed through a fixed approximate conditional oracle, and studies whether total evaluations, including discovery, can be sublinear in sequence length $N; sublinear sequential depth then follows.

Ryotaro Kawata, Satoshi Hayakawa, Taiji Suzuki · 0 citations

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