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R. Baptista

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#machine learning Preprint Oct 2026

Simulation-Free Learning of Population Dynamics with Wasserstein Lagrangian Residuals

The dynamics of cells, organisms, and fluids are often modeled as probability distributions evolving over time. Reconstructing and extrapolating this evolution from unpaired snapshots requires assumptions about the underlying process. Wasserstein gradient flows are a common choice, but they cannot describe conservative...

F. Sergeev, Markus Heinonen, Daniel Waxman et al. · 0 citations
#machine learning Preprint Sep 2026

One-Step Generative Surrogate Models via Block-Triangular Joint Drifting

Drifting provides a direct route to one-step generative models, but applying it directly to stochastic transition modeling requires multiple samples of the next state conditioned on the same current state. Standard trajectory data, however, typically provide only one realized next state for each observed current state...

Nicholas Geissler, Shreyas Jha, R. Baptista et al. · 0 citations
Preprint Sep 2026

Approximating Measures on Function Spaces: Transport and Truncation

This work introduces the class $\mathcal{P}_\psi(\mu)$ of measures that differ from a reference measure only through a finite-dimensional map $\psi$ while preserving the reference conditionals on its fibers, and develops approximation theory for fitting within it.

R. Baptista, Bamdad Hosseini, Alexander Hsu · 0 citations
Jul 2026

Gradient-free Riemannian Langevin Sampler

This work proposes Gradient-free Riemannian Langevin Sampler (GRiLS), a novel proposal that improves exploration without requiring gradient evaluations of the target density, and introduces a Riemannian metric which reshapes the local geometry in order to facilitate transitions across modes.

R. Baptista, O. Zahm · 0 citations
Jul 2026

Wasserstein Residuals: Learning Gradient Flows from Population Dynamics

It is demonstrated that the stitching method achieves state-of-the-art performance across trajectory inference benchmarks, and unifies several existing methods and leads to a new particle-based method, stitching, that is simulation-free and robust to large gaps between observations.

Markus Heinonen, Yair Shenfeld, R. Baptista et al. · 0 citations

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