Search Results for author: Harbir Antil

Found 13 papers, 2 papers with code

Mathematical Opportunities in Digital Twins (MATH-DT)

no code implementations15 Feb 2024 Harbir Antil

It illustrates that foundational Mathematical advances are required for Digital Twins (DTs) that are different from traditional approaches.

Math

On-Manifold Projected Gradient Descent

no code implementations23 Aug 2023 Aaron Mahler, Tyrus Berry, Tom Stephens, Harbir Antil, Michael Merritt, Jeanie Schreiber, Ioannis Kevrekidis

We use these tools to obtain adversarial examples that reside on a class manifold, yet fool a classifier.

Adversarial Attack

GNEP Based Dynamic Segmentation and Motion Estimation for Neuromorphic Imaging

no code implementations5 Jul 2023 Harbir Antil, David Sayre

This paper explores the application of event-based cameras in the domains of image segmentation and motion estimation.

Image Segmentation Motion Estimation +2

Neural Network Representation of Time Integrators

no code implementations30 Nov 2022 Rainald Löhner, Harbir Antil

Deep neural network (DNN) architectures are constructed that are the exact equivalent of explicit Runge-Kutta schemes for numerical time integration.

An Optimal Time Variable Learning Framework for Deep Neural Networks

1 code implementation18 Apr 2022 Harbir Antil, Hugo Díaz, Evelyn Herberg

The proposed framework can be applied to any of the existing networks such as ResNet, DenseNet or Fractional-DNN.

NINNs: Nudging Induced Neural Networks

no code implementations15 Mar 2022 Harbir Antil, Rainald Löhner, Randy Price

The NINNs framework can be applied to almost all pre-existing DNNs, with forward propagation, with costs comparable to existing DNNs.

Novel DNNs for Stiff ODEs with Applications to Chemically Reacting Flows

no code implementations1 Apr 2021 Thomas S. Brown, Harbir Antil, Rainald Löhner, Fumiya Togashi, Deepanshu Verma

Chemically reacting flows are common in engineering, such as hypersonic flow, combustion, explosions, manufacturing processes and environmental assessments.

Novel Deep neural networks for solving Bayesian statistical inverse

no code implementations8 Feb 2021 Harbir Antil, Howard C Elman, Akwum Onwunta, Deepanshu Verma

We consider the simulation of Bayesian statistical inverse problems governed by large-scale linear and nonlinear partial differential equations (PDEs).

Fractional Deep Neural Network via Constrained Optimization

no code implementations1 Apr 2020 Harbir Antil, Ratna Khatri, Rainald Löhner, Deepanshu Verma

This paper introduces a novel algorithmic framework for a deep neural network (DNN), which in a mathematically rigorous manner, allows us to incorporate history (or memory) into the network -- it ensures all layers are connected to one another.

Bilevel Optimization, Deep Learning and Fractional Laplacian Regularization with Applications in Tomography

no code implementations22 Jul 2019 Harbir Antil, Zichao, Di, Ratna Khatri

As an example, we consider tomographic reconstruction as a model problem and show an improvement in reconstruction quality, especially for limited data, via fractional Laplacian regularization.

Bilevel Optimization

Adaptive particle-based approximations of the Gibbs posterior for inverse problems

no code implementations2 Jul 2019 Zilong Zou, Sayan Mukherjee, Harbir Antil, Wilkins Aquino

To manage the computational cost of propagating increasing numbers of particles through the loss function, we employ a recently developed local reduced basis method to build an efficient surrogate loss function that is used in the Gibbs update formula in place of the true loss.

Bayesian Inference

A Note on QR-Based Model Reduction: Algorithm, Software, and Gravitational Wave Applications

1 code implementation16 May 2018 Harbir Antil, Dangxing Chen, Scott E. Field

While the proper orthogonal decomposition (POD) is optimal under certain norms it's also expensive to compute.

Distributed, Parallel, and Cluster Computing General Relativity and Quantum Cosmology Numerical Analysis

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