arXiv Machine Learning

Exact SO(3)-Equivariant Isotropic Kernels for Rotation-Robust Neural Dynamics

The paper introduces the Invariant-Conditioned Isotropic Kernel Neural Operator (IKNO), a compact graph model designed to predict vector-valued partial differential equations in a rotation‑robust manner. IKNO constructs local interactions from rotation‑invariant scalar quantities and vector directions that transform consistently with the data, ensuring that rotating input positions and velocities results in a correspondingly rotated predicted velocity change. Experiments on three‑dimensional Navier–Stokes dynamics show that IKNO achieves numerical precision consistency, matches the forecasting accuracy of a larger rotation‑aware Tensor Field Network, and outperforms a parameter‑matched graph simulator.

arXiv Machine Learning
Sep 2

Efficient Adaptation of ROMs for Unsteady Flows Using Data Assimilation

The paper presents a lightweight retraining strategy for a parameterized Reduced Order Model (ROM) that achieves full‑model accuracy using only a fraction of the computational effort and sparse observations. The ROM architecture combines a Variational Autoencoder for dimensionality reduction with a transformer network that evolves latent states while accounting for the Reynolds number as an external control variable. By leveraging the probabilistic VAE, the method generates trajectory ensembles and uncertainty estimates, and adapts to out‑of‑sample parameters through sparse data assimilation with an ensemble Kalman filter, focusing retraining on the autoencoder to correct latent manifold distortions.

By Isma\"el Zighed, Andrea N\'ovoa, Luca Magri, Taraneh Sayadi
arXiv AI
Jul 7

Conditional Clifford-Steerable CNNs for PDE Modeling

arXiv:2510. 14007v2 Announce Type: replace-cross Abstract: We introduce Conditional Clifford-Steerable CNNs (C-CSCNNs), a unified framework that incorporates equivariance to arbitrary pseudo-Euclidean groups and significantly improves the expressivity of standard CSCNNs.

By B\'alint L\'aszl\'o Szarvas, Maksim Zhdanov