抖阴视频

The Rector of the National Technical University of Athens, Andreas G. Boudouvis, invites you to attend the following webinar organised on the initiative of the Institute for Structural Analysis and Antiseismic Research of the School of Civil Engineering at NTUA.

Webinar

From Neural PDEs to Neural Operators: Blending data and physics for fast predictions

The Charles Pitts Robinson and John Palmer Barstow Professor
of Applied Mathematics and Engineering, Brown University, USA;
Also @MIT & PNNL

Tuesday, 10 May 2022, 17.00 EEST

Webex Webinar:

NTUA youtube channel: (live)

Abstract: We will review physics-informed neural network and summarize available extensions for applications in computational mechanics and beyond. We will also introduce new NNs that learn functionals and nonlinear operators from functions and corresponding responses for system identification. The universal approximation theorem of operators is suggestive of the potential of NNs in learning from scattered data any continuous operator or complex system. We first generalize the theorem to deep neural networks, and subsequently we apply it to design a new composite NN with small generalization error, the deep operator network (DeepONet), consisting of a NN for encoding the discrete input function space (branch net) and another NN for encoding the domain of the output functions (trunk net). We demonstrate that DeepONet can learn various explicit operators, e.g., integrals, Laplace transforms and fractional Laplacians, as well as implicit operators that represent deterministic and stochastic differential equations. More generally, DeepOnet can learn multiscale operators spanning across many scales and trained by diverse sources of data simultaneously.