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Heiko Hoffmann

5 accepted papers

2021

Pooling by Sliced-Wasserstein Embedding

NeurIPS 2021poster

Learning representations from sets has become increasingly important with many applications in point cloud processing, graph learning, image/video recognition, and object detection. We introduce a geometrically-interpretable and generic pooling mechanism for aggregating a set of features into a fixe…

2021

Wasserstein Embedding for Graph Learning

ICLR 2021poster

We present Wasserstein Embedding for Graph Learning (WEGL), a novel and fast framework for embedding entire graphs in a vector space, in which various machine learning models are applicable for graph-level prediction tasks. We leverage new insights on defining similarity between graphs as a function…

2020

Universal Litmus Patterns: Revealing Backdoor Attacks in CNNs

CVPR 2020oral

The unprecedented success of deep neural networks in many applications has made these networks a prime target for adversarial exploitation. In this paper, we introduce a benchmark technique for detecting backdoor attacks (aka Trojan attacks) on deep convolutional neural networks (CNNs). We introduce…

Cited by 277PDFcodeScholar
2019

Explainability Methods for Graph Convolutional Neural Networks

CVPR 2019oral

With the growing use of graph convolutional neural networks (GCNNs) comes the need for explainability. In this paper, we introduce explainability methods for GCNNs. We develop the graph analogues of three prominent explainability methods for convolutional neural networks: contrastive gradient-based…

Cited by 716PDFScholar
2018

Sliced Wasserstein Distance for Learning Gaussian Mixture Models

CVPR 2018poster

Gaussian mixture models (GMM) are powerful parametric tools with many applications in machine learning and computer vision. Expectation maximization (EM) is the most popular algorithm for estimating the GMM parameters. However, EM guarantees only convergence to a stationary point of the log-likelih…

Cited by 176SourcePDFScholar