1 code implementation • 15 Apr 2023 • Katiana Kontolati, Somdatta Goswami, George Em Karniadakis, Michael D. Shields
Operator regression provides a powerful means of constructing discretization-invariant emulators for partial-differential equations (PDEs) describing physical systems.
1 code implementation • 20 Apr 2022 • Somdatta Goswami, Katiana Kontolati, Michael D. Shields, George Em Karniadakis
Transfer learning (TL) enables the transfer of knowledge gained in learning to perform one task (source) to a related but different task (target), hence addressing the expense of data acquisition and labeling, potential computational power limitations, and dataset distribution mismatches.
1 code implementation • 9 Mar 2022 • Katiana Kontolati, Somdatta Goswami, Michael D. Shields, George Em Karniadakis
In contrast, an even highly over-parameterized DeepONet leads to better generalization for both smooth and non-smooth dynamics.
no code implementations • 9 Feb 2022 • Katiana Kontolati, Dimitrios Loukrezis, Dimitris G. Giovanis, Lohit Vandanapu, Michael D. Shields
Constructing surrogate models for uncertainty quantification (UQ) on complex partial differential equations (PDEs) having inherently high-dimensional $\mathcal{O}(10^{\ge 2})$ stochastic inputs (e. g., forcing terms, boundary conditions, initial conditions) poses tremendous challenges.
no code implementations • 28 Sep 2021 • Ketson R. M. dos Santos, Dimitrios G. Giovanis, Katiana Kontolati, Dimitrios Loukrezis, Michael D. Shields
Using this representation, geometric harmonics, an out-of-sample function extension technique, is employed to create a global map from the space of input parameters to a Grassmannian diffusion manifold.
no code implementations • 17 Aug 2021 • Katiana Kontolati, Natalie Klein, Nishant Panda, Diane Oyen
Constructing probability densities for inference in high-dimensional spectral data is often intractable.
2 code implementations • 21 Jul 2021 • Katiana Kontolati, Dimitrios Loukrezis, Ketson R. M. dos Santos, Dimitrios G. Giovanis, Michael D. Shields
For this purpose, we employ Grassmannian diffusion maps, a two-step nonlinear dimension reduction technique which allows us to reduce the dimensionality of the data and identify meaningful geometric descriptions in a parsimonious and inexpensive manner.