Search Results for author: Vegard Antun

Found 5 papers, 5 papers with code

Implicit regularization in AI meets generalized hardness of approximation in optimization -- Sharp results for diagonal linear networks

1 code implementation13 Jul 2023 Johan S. Wind, Vegard Antun, Anders C. Hansen

In this work we provide sharp results for the implicit regularization imposed by the gradient flow of Diagonal Linear Networks (DLNs) in the over-parameterized regression setting and, potentially surprisingly, link this to the phenomenon of phase transitions in generalized hardness of approximation (GHA).

Can stable and accurate neural networks be computed? -- On the barriers of deep learning and Smale's 18th problem

1 code implementation20 Jan 2021 Matthew J. Colbrook, Vegard Antun, Anders C. Hansen

We address this paradox by demonstrating basic well-conditioned problems in scientific computing where one can prove the existence of NNs with great approximation qualities, however, there does not exist any algorithm, even randomised, that can train (or compute) such a NN.

The troublesome kernel -- On hallucinations, no free lunches and the accuracy-stability trade-off in inverse problems

1 code implementation5 Jan 2020 Nina M. Gottschling, Vegard Antun, Anders C. Hansen, Ben Adcock

In inverse problems in imaging, the focus of this paper, there is increasing empirical evidence that methods may suffer from hallucinations, i. e., false, but realistic-looking artifacts; instability, i. e., sensitivity to perturbations in the data; and unpredictable generalization, i. e., excellent performance on some images, but significant deterioration on others.

Hallucination Image Classification

What do AI algorithms actually learn? - On false structures in deep learning

1 code implementation4 Jun 2019 Laura Thesing, Vegard Antun, Anders C. Hansen

We provide the foundations for such a program establishing the existence of the false structures in practice.

On instabilities of deep learning in image reconstruction - Does AI come at a cost?

1 code implementation14 Feb 2019 Vegard Antun, Francesco Renna, Clarice Poon, Ben Adcock, Anders C. Hansen

Deep learning, due to its unprecedented success in tasks such as image classification, has emerged as a new tool in image reconstruction with potential to change the field.

Image Classification Image Reconstruction

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