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Volker Fischer

13 accepted papers

2025

Two Effects, One Trigger: On the Modality Gap, Object Bias, and Information Imbalance in Contrastive Vision-Language Models

ICLR 2025oral

Contrastive vision-language models (VLMs), like CLIP, have gained popularity for their versatile applicability to various downstream tasks. Despite their successes in some tasks, like zero-shot object recognition, they perform surprisingly poor on other tasks, like attribute recognition. Previous wo…

2024

Eureka-Moments in Transformers: Multi-Step Tasks Reveal Softmax Induced Optimization Problems

ICML 2024poster

In this work, we study rapid improvements of the training loss in transformers when being confronted with multi-step decision tasks. We found that transformers struggle to learn the intermediate task and both training and validation loss saturate for hundreds of epochs. When transformers finally lea…

2022

Contrasting Quadratic Assignments for Set-Based Representation Learning

ECCV 2022poster

"The standard approach to contrastive learning is to maximize the agreement between different views of the data. The views are ordered in pairs, such that they are either positive, encoding different views of the same object, or negative, corresponding to views of different objects. The supervisory…

2022

Overcoming Shortcut Learning in a Target Domain by Generalizing Basic Visual Factors from a Source Domain

ECCV 2022poster

"Shortcut learning occurs when a deep neural network overly relies on spurious correlations in the training dataset in order to solve downstream tasks. Prior works have shown how this impairs the compositional generalization capability of deep learning models. To address this problem, we propose a n…

2021

DiagViB-6: A Diagnostic Benchmark Suite for Vision Models in the Presence of Shortcut and Generalization Opportunities

ICCV 2021poster

Common deep neural networks (DNNs) for image classification have been shown to rely on shortcut opportunities (SO) in the form of predictive and easy-to-represent visual factors. This is known as shortcut learning and leads to impaired generalization. In this work, we show that common DNNs also suff…

Cited by 13PDFcodeScholar
2021

Does enhanced shape bias improve neural network robustness to common corruptions?

ICLR 2021poster

Convolutional neural networks (CNNs) learn to extract representations of complex features, such as object shapes and textures to solve image recognition tasks. Recent work indicates that CNNs trained on ImageNet are biased towards features that encode textures and that these alone are sufficient to…

Cited by 44SourcePDFScholar
2021

Fostering Generalization in Single-View 3D Reconstruction by Learning a Hierarchy of Local and Global Shape Priors

CVPR 2021poster

Single-view 3D object reconstruction has seen much progress, yet methods still struggle generalizing to novel shapes unseen during training. Common approaches predominantly rely on learned global shape priors and, hence, disregard detailed local observations. In this work, we address this issue by l…

Cited by 22PDFScholar
2020

SE(3)-Transformers: 3D Roto-Translation Equivariant Attention Networks

NeurIPS 2020poster

We introduce the SE(3)-Transformer, a variant of the self-attention module for 3D point-clouds, which is equivariant under continuous 3D roto-translations. Equivariance is important to ensure stable and predictable performance in the presence of nuisance transformations of the data input. A positive…

2019

Grid Saliency for Context Explanations of Semantic Segmentation

NeurIPS 2019poster

Recently, there has been a growing interest in developing saliency methods that provide visual explanations of network predictions. Still, the usability of existing methods is limited to image classification models. To overcome this limitation, we extend the existing approaches to generate grid sali…

2018

The streaming rollout of deep networks - towards fully model-parallel execution

NeurIPS 2018poster

Deep neural networks, and in particular recurrent networks, are promising candidates to control autonomous agents that interact in real-time with the physical world. However, this requires a seamless integration of temporal features into the network’s architecture. For the training of and inference…

2017

Universal Adversarial Perturbations Against Semantic Image Segmentation

ICCV 2017poster

While deep learning is remarkably successful on perceptual tasks, it was also shown to be vulnerable to adversarial perturbations of the input. These perturbations denote noise added to the input that was generated specifically to fool the system while being quasi-imperceptible for humans. More seve…

Cited by 311PDFScholar
2015

Inverse reinforcement learning of behavioral models for online-adapting navigation strategies

ICRA 2015poster

To increase the acceptance of autonomous systems in populated environments, it is indispensable to teach them social behavior. We would expect a social robot, which plans its motions among humans, to consider both the social acceptability of its behavior as well as task constraints, such as time lim…

Cited by 37SourceScholar