CHARLEMAGNE DISTINGUISHED LECTURE SERIES -Karniadakis Seminar
Location: Joint Zoom Meeting. A link for the Zoom meeting room will be send in the newsletter one week before the seminar starts. If you need any organizational help please contact firstname.lastname@example.org
Prof. George Em Karniadakis, Ph.D. - Physics-Informed Neural Networks (PINNs): An Alphabet of Algorithms for Diverse Applications
Professor of Applied Mathematics
The Charles Pitts Robinson and John Palmer Barstow, Brown University
We will present a new approach to develop a data-driven, learning-based framework for predicting outcomes of physical and biological systems and for discovering hidden physics from noisy data. We will introduce a deep learning approach based on neural networks (NNs) and generative adversarial networks (GANs). We also introduce new NNs that learn functionals and nonlinear operators from functions and corresponding responses for system identification. Unlike other approaches that rely on big data, here we “learn” from small data by exploiting the information provided by the physical conservation laws, which are used to obtain informative priors or regularize the neural networks. We will also make connections between Gauss Process Regression and NNs, and discuss the new powerful concept of meta-learning. We will demonstrate the power of PINNs for several inverse problems in fluid mechanics, solid mechanics and biomedicine including wake flows, shock tube problems, material characterization, brain aneurysms, etc, where traditional methods fail due to lack of boundary and initial conditions or material properties. There are many versions of PINNs, e.g., variational (VPINNs), stochastic (sPINNs), conservative (cPINNs), nonlocal (nPINNs), generalized (xPINNs), etc, and we will provide some highlights. In addition, we will present our recent theoretical results on the convergence and generation of PINNs.