IAM

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A Short Introduction to Bayesian Neural Networks

With the rising success of deep neural networks, their reliability in terms of robustness (for example, against various kinds of adversarial examples) and confidence estimates becomes increasingly important. Bayesian neural networks promise to address these issues by directly modeling the uncertainty of the estimated network weights. In this article, I want to give a short introduction of training Bayesian neural networks, covering three recent approaches.

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AI and Deep Learning at the 7th Heidelberg Laureate Forum 2019

The Heidelberg Laureate Forum brings together young researchers and laureates in computer science and mathematics. During lectures, workshops, panel discussions and social events, the forum fosters personal and scientific exchange with other young researchers as well as laureates. I was incredibly lucky to have the opportunity to participate in the 7th Heidelberg Laureate Forum 2019. In this article, I want to give a short overview of the forum and share some of my impressions.

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More Examples for Working with Torch

This article is a short follow-up on my initial collection of examples for getting started with Torch. In the meanwhile, through a series of additional articles, the corresponding GitHub repository has grown, including not only basic examples but also more advanced examples such as variational auto-encoders, generative adversarial networks or adversarial auto encoders. This article aims to provide a short overview of the added examples.

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ArXiv Pre-Print “Confidence-Calibrated Adversarial Training”

Adversarial training is the de-facto standard to obtain models robust against adversarial examples. However, on complex datasets, a significant loss in accuracy is incurred and the robustness does not generalize to attacks not used during training. This paper introduces confidence-calibrated adversarial training. By forcing the confidence on adversarial examples to decay with their distance to the training data, the loss in accuracy is reduced and robustness generalizes to other attacks and larger perturbations.

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Qualcomm Innovation Fellowship Europe 2019

In early May, I received the Qualcomm Innovation Fellowship 2019 for my ongoing research on adversarial robustness of deep neural networks. After an initial application round, I was invited to the University of Amsterdam’s Science Park for the finalist round. The winners were selected based on a short research talk including questions from Qualcomm researchers.

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CVPR’19 Poster “Disentangling Adversarial Robustness and Generalization”

This article presents the poster for our CVPR’19 paper on adversarial robustness and generalization. In addition to CVPR’19, we also presented this work at the ICML’19 Workshop on Uncertainty and Robustness in Deep Learning, with a slightly smaller poster.

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CVPR Paper “Disentangling Adversarial Robustness and Generalization”

Our paper on adversarial robustness and generalization was accepted at CVPR’19. In the revised paper, we show that adversarial examples usually leave the manifold, including a brief theoretical argumentation. Similarly, adversarial examples can be found on the manifold; then, robustness is nothing else than generalization. For (off-manifold) adversarial examples, in contrast, we show that generalization and robustness are not necessarily contradicting objectives. As example, on synthetic data, we adversarially train a robust and accurate model. This article gives a short abstract and provides the paper including appendix.

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Towards a Definition for Adversarial Examples

Obtaining deep networks robust against adversarial examples is a widely open problem. While many papers are devoted to training more robust deep networks, a clear definition of adversarial examples has not been agreed upon. In this article, I want to discuss two very simple toy examples illustrating the necessity of a proper definition of adversarial examples.

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Convolutional Batch Normalization for OctNets

During my master thesis I partly worked on OctNets, octree-bases convolutional neural networks for efficient learning in 3D. Among others, I implemented convolutional batch normalization for OctNets. This article briefly discusses the implementation, which will be available on GitHub.

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Visualizing Occupancy Grids, Meshes and Point Clouds using Blender and Python

Obtaining high-quality visualizations of 3D data such as triangular meshes or occupancy grids, as needed for publications in computer graphics and computer vision, is difficult. In this article, I want to present a GitHub repository containing some utility scripts for paper-ready visualizations of meshes and occupancy grids using Blender and Python.

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