Search Results for author: Jan Schuchardt

Found 11 papers, 2 papers with code

Group Privacy Amplification and Unified Amplification by Subsampling for Rényi Differential Privacy

no code implementations7 Mar 2024 Jan Schuchardt, Mihail Stoian, Arthur Kosmala, Stephan Günnemann

Differential privacy (DP) has various desirable properties, such as robustness to post-processing, group privacy, and amplification by subsampling, which can be derived independently of each other.

Hierarchical Randomized Smoothing

no code implementations NeurIPS 2023 Yan Scholten, Jan Schuchardt, Aleksandar Bojchevski, Stephan Günnemann

Randomized smoothing is a powerful framework for making models provably robust against small changes to their inputs - by guaranteeing robustness of the majority vote when randomly adding noise before classification.

Node Classification

Collective Robustness Certificates: Exploiting Interdependence in Graph Neural Networks

no code implementations6 Feb 2023 Jan Schuchardt, Aleksandar Bojchevski, Johannes Gasteiger, Stephan Günnemann

In tasks like node classification, image segmentation, and named-entity recognition we have a classifier that simultaneously outputs multiple predictions (a vector of labels) based on a single input, i. e. a single graph, image, or document respectively.

Adversarial Robustness Image Segmentation +5

Randomized Message-Interception Smoothing: Gray-box Certificates for Graph Neural Networks

1 code implementation5 Jan 2023 Yan Scholten, Jan Schuchardt, Simon Geisler, Aleksandar Bojchevski, Stephan Günnemann

To remedy this, we propose novel gray-box certificates that exploit the message-passing principle of GNNs: We randomly intercept messages and carefully analyze the probability that messages from adversarially controlled nodes reach their target nodes.

Adversarial Robustness

Invariance-Aware Randomized Smoothing Certificates

no code implementations25 Nov 2022 Jan Schuchardt, Stephan Günnemann

Building models that comply with the invariances inherent to different domains, such as invariance under translation or rotation, is a key aspect of applying machine learning to real world problems like molecular property prediction, medical imaging, protein folding or LiDAR classification.

Molecular Property Prediction Property Prediction +1

Localized Randomized Smoothing for Collective Robustness Certification

no code implementations28 Oct 2022 Jan Schuchardt, Tom Wollschläger, Aleksandar Bojchevski, Stephan Günnemann

We further show that this approach is beneficial for the larger class of softly local models, where each output is dependent on the entire input but assigns different levels of importance to different input regions (e. g. based on their proximity in the image).

Image Segmentation Node Classification +1

Collective Robustness Certificates

no code implementations ICLR 2021 Jan Schuchardt, Aleksandar Bojchevski, Johannes Klicpera, Stephan Günnemann

In tasks like node classification, image segmentation, and named-entity recognition we have a classifier that simultaneously outputs multiple predictions (a vector of labels) based on a single input, i. e. a single graph, image, or document respectively.

Adversarial Robustness Image Segmentation +5

Learning to Evolve

1 code implementation8 May 2019 Jan Schuchardt, Vladimir Golkov, Daniel Cremers

Here we show that learning to evolve, i. e. learning to mutate and recombine better than at random, improves the result of evolution in terms of fitness increase per generation and even in terms of attainable fitness.

Evolutionary Algorithms reinforcement-learning +1

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