Search Results for author: Steffen Staab

Found 53 papers, 24 papers with code

LLMs4Life: Large Language Models for Ontology Learning in Life Sciences

no code implementations2 Dec 2024 Nadeen Fathallah, Steffen Staab, Alsayed Algergawy

Our work evaluates the capabilities of LLMs in ontology learning in the context of highly specialized and complex domains such as life science domains.

F -- A Model of Events based on the Foundational Ontology DOLCE+DnS Ultralite

1 code implementation25 Nov 2024 Ansgar Scherp, Thomas Franz, Carsten Saathoff, Steffen Staab

The lack of a formal model of events hinders interoperability in distributed event-based systems.

DAGE: DAG Query Answering via Relational Combinator with Logical Constraints

no code implementations29 Oct 2024 Yunjie He, Bo Xiong, Daniel Hernández, Yuqicheng Zhu, Evgeny Kharlamov, Steffen Staab

We show that it is possible to implement DAGE on top of existing query embedding methods, and we empirically measure the improvement of our method over the results of vanilla methods evaluated in tree-form queries that approximate the DAG queries of our proposed benchmark.

Knowledge Graphs

Visual Representation Learning Guided By Multi-modal Prior Knowledge

no code implementations21 Oct 2024 Hongkuan Zhou, Lavdim Halilaj, Sebastian Monka, Stefan Schmid, Yuqicheng Zhu, Bo Xiong, Steffen Staab

The respective embeddings are generated from the given modalities in a common latent space, i. e., visual embeddings from original and synthetic images as well as knowledge graph embeddings (KGEs).

Image Classification Knowledge Graph Embeddings

Is Complex Query Answering Really Complex?

no code implementations16 Oct 2024 Cosimo Gregucci, Bo Xiong, Daniel Hernandez, Lorenzo Loconte, Pasquale Minervini, Steffen Staab, Antonio Vergari

The performance of state-of-the-art CQA models drops significantly when such models are evaluated on queries that cannot be reduced to easier types.

Complex Query Answering Link Prediction

LMT-Net: Lane Model Transformer Network for Automated HD Mapping from Sparse Vehicle Observations

no code implementations19 Sep 2024 Michael Mink, Thomas Monninger, Steffen Staab

We evaluate the performance of LMT-Net on an internal dataset that consists of multiple vehicle observations as well as human annotations as Ground Truth (GT).

Autonomous Driving Decoder

Conformalized Answer Set Prediction for Knowledge Graph Embedding

no code implementations15 Aug 2024 Yuqicheng Zhu, Nico Potyka, Jiarong Pan, Bo Xiong, Yunjie He, Evgeny Kharlamov, Steffen Staab

Knowledge graph embeddings (KGE) apply machine learning methods on knowledge graphs (KGs) to provide non-classical reasoning capabilities based on similarities and analogies.

Conformal Prediction Knowledge Graph Embedding +3

Predictive Multiplicity of Knowledge Graph Embeddings in Link Prediction

no code implementations15 Aug 2024 Yuqicheng Zhu, Nico Potyka, Mojtaba Nayyeri, Bo Xiong, Yunjie He, Evgeny Kharlamov, Steffen Staab

Our empirical study reveals significant predictive multiplicity in link prediction, with $8\%$ to $39\%$ testing queries exhibiting conflicting predictions.

Knowledge Graph Embedding Knowledge Graph Embeddings +2

eSPARQL: Representing and Reconciling Agnostic and Atheistic Beliefs in RDF-star Knowledge Graphs

no code implementations31 Jul 2024 Xinyi Pan, Daniel Hernández, Philipp Seifer, Ralf Lämmel, Steffen Staab

Over the past few years, we have seen the emergence of large knowledge graphs combining information from multiple sources.

Knowledge Graphs valid

TempBEV: Improving Learned BEV Encoders with Combined Image and BEV Space Temporal Aggregation

no code implementations17 Apr 2024 Thomas Monninger, Vandana Dokkadi, Md Zafar Anwar, Steffen Staab

These results indicate the overall effectiveness of our approach and make a strong case for aggregating temporal information in both image and BEV latent spaces.

3D Object Detection Autonomous Driving +2

Hybrid Reasoning Based on Large Language Models for Autonomous Car Driving

1 code implementation21 Feb 2024 Mehdi Azarafza, Mojtaba Nayyeri, Charles Steinmetz, Steffen Staab, Achim Rettberg

Large Language Models (LLMs) have garnered significant attention for their ability to understand text and images, generate human-like text, and perform complex reasoning tasks.

Autonomous Driving Common Sense Reasoning +1

From Shapes to Shapes: Inferring SHACL Shapes for Results of SPARQL CONSTRUCT Queries (Extended Version)

1 code implementation13 Feb 2024 Philipp Seifer, Daniel Hernández, Ralf Lämmel, Steffen Staab

However, it becomes challenging to understand what graph data can be expected at the end of a data processing pipeline without knowing the particular input data: Shape constraints on the input graph may affect the output graph, but may no longer apply literally, and new shapes may be imposed by the query template.

Robust Knowledge Extraction from Large Language Models using Social Choice Theory

no code implementations22 Dec 2023 Nico Potyka, Yuqicheng Zhu, Yunjie He, Evgeny Kharlamov, Steffen Staab

Large-language models (LLMs) can support a wide range of applications like conversational agents, creative writing or general query answering.

HGE: Embedding Temporal Knowledge Graphs in a Product Space of Heterogeneous Geometric Subspaces

1 code implementation21 Dec 2023 Jiaxin Pan, Mojtaba Nayyeri, Yinan Li, Steffen Staab

Temporal knowledge graphs may exhibit static temporal patterns at distinct points in time and dynamic temporal patterns between different timestamps.

Knowledge Graphs

NestE: Modeling Nested Relational Structures for Knowledge Graph Reasoning

1 code implementation14 Dec 2023 Bo Xiong, Mojtaba Nayyeri, Linhao Luo, ZiHao Wang, Shirui Pan, Steffen Staab

NestE represents each atomic fact as a $1\times3$ matrix, and each nested relation is modeled as a $3\times3$ matrix that rotates the $1\times3$ atomic fact matrix through matrix multiplication.

Knowledge Graphs Link Prediction

Adversarial Reweighting Guided by Wasserstein Distance for Bias Mitigation

no code implementations21 Nov 2023 Xuan Zhao, Simone Fabbrizzi, Paula Reyero Lobo, Siamak Ghodsi, Klaus Broelemann, Steffen Staab, Gjergji Kasneci

To balance the data distribution between the majority and the minority groups, our approach deemphasizes samples from the majority group.

Fairness

Semantic Map Learning of Traffic Light to Lane Assignment based on Motion Data

1 code implementation26 Sep 2023 Thomas Monninger, Andreas Weber, Steffen Staab

We show the effectiveness of basic statistical approaches for this task by implementing and evaluating a pattern-based contribution method.

Autonomous Vehicles motion prediction +1

Shrinking Embeddings for Hyper-Relational Knowledge Graphs

1 code implementation3 Jun 2023 Bo Xiong, Mojtaba Nayyer, Shirui Pan, Steffen Staab

Although some recent works have proposed to embed hyper-relational KGs, these methods fail to capture essential inference patterns of hyper-relational facts such as qualifier monotonicity, qualifier implication, and qualifier mutual exclusion, limiting their generalization capability.

Knowledge Graphs Link Prediction

Geometric Relational Embeddings: A Survey

no code implementations24 Apr 2023 Bo Xiong, Mojtaba Nayyeri, Ming Jin, Yunjie He, Michael Cochez, Shirui Pan, Steffen Staab

Geometric relational embeddings map relational data as geometric objects that combine vector information suitable for machine learning and structured/relational information for structured/relational reasoning, typically in low dimensions.

Hierarchical Multi-label Classification Knowledge Graph Completion +2

HiPrompt: Few-Shot Biomedical Knowledge Fusion via Hierarchy-Oriented Prompting

no code implementations12 Apr 2023 Jiaying Lu, Jiaming Shen, Bo Xiong, Wenjing Ma, Steffen Staab, Carl Yang

Medical decision-making processes can be enhanced by comprehensive biomedical knowledge bases, which require fusing knowledge graphs constructed from different sources via a uniform index system.

Decision Making Knowledge Graphs

Modeling Relational Patterns for Logical Query Answering over Knowledge Graphs

no code implementations21 Mar 2023 Yunjie He, Mojtaba Nayyeri, Bo Xiong, Yuqicheng Zhu, Evgeny Kharlamov, Steffen Staab

However, the role of such patterns in answering FOL queries by query embedding models has not been yet studied in the literature.

Inductive Bias Knowledge Graphs

Beyond Demographic Parity: Redefining Equal Treatment

no code implementations14 Mar 2023 Carlos Mougan, Laura State, Antonio Ferrara, Salvatore Ruggieri, Steffen Staab

Liberalism-oriented political philosophy reasons that all individuals should be treated equally independently of their protected characteristics.

Fairness Philosophy

Explanation Shift: How Did the Distribution Shift Impact the Model?

no code implementations14 Mar 2023 Carlos Mougan, Klaus Broelemann, David Masip, Gjergji Kasneci, Thanassis Thiropanis, Steffen Staab

Then, state-of-the-art techniques model input data distributions or model prediction distributions and try to understand issues regarding the interactions between learned models and shifting distributions.

SCENE: Reasoning about Traffic Scenes using Heterogeneous Graph Neural Networks

1 code implementation9 Jan 2023 Thomas Monninger, Julian Schmidt, Jan Rupprecht, David Raba, Julian Jordan, Daniel Frank, Steffen Staab, Klaus Dietmayer

In this work we propose SCENE, a methodology to encode diverse traffic scenes in heterogeneous graphs and to reason about these graphs using a heterogeneous Graph Neural Network encoder and task-specific decoders.

Graph Neural Network Knowledge Graphs +1

Predicting Eye Gaze Location on Websites

no code implementations15 Nov 2022 Ciheng Zhang, Decky Aspandi, Steffen Staab

This is done by the curation of a unified dataset that consists of website screenshots, eye-gaze heatmap and website's layout information in the form of image and text masks.

Gaze Prediction

Explanation Shift: Detecting distribution shifts on tabular data via the explanation space

no code implementations22 Oct 2022 Carlos Mougan, Klaus Broelemann, Gjergji Kasneci, Thanassis Tiropanis, Steffen Staab

We provide a mathematical analysis of different types of distribution shifts as well as synthetic experimental examples.

Integrating Knowledge Graph embedding and pretrained Language Models in Hypercomplex Spaces

1 code implementation4 Aug 2022 Mojtaba Nayyeri, ZiHao Wang, Mst. Mahfuja Akter, Mirza Mohtashim Alam, Md Rashad Al Hasan Rony, Jens Lehmann, Steffen Staab

In our approach, we build on existing strong representations of single modalities and we use hypercomplex algebra to represent both, (i), single-modality embedding as well as, (ii), the interaction between different modalities and their complementary means of knowledge representation.

Knowledge Graph Embedding Knowledge Graphs +2

Ultrahyperbolic Knowledge Graph Embeddings

no code implementations1 Jun 2022 Bo Xiong, Shichao Zhu, Mojtaba Nayyeri, Chengjin Xu, Shirui Pan, Chuan Zhou, Steffen Staab

Recent knowledge graph (KG) embeddings have been advanced by hyperbolic geometry due to its superior capability for representing hierarchies.

Knowledge Graph Embeddings

Detecting Anomalies within Time Series using Local Neural Transformations

1 code implementation8 Feb 2022 Tim Schneider, Chen Qiu, Marius Kloft, Decky Aspandi Latif, Steffen Staab, Stephan Mandt, Maja Rudolph

We develop a new method to detect anomalies within time series, which is essential in many application domains, reaching from self-driving cars, finance, and marketing to medical diagnosis and epidemiology.

Anomaly Detection Epidemiology +5

Fairness Implications of Encoding Protected Categorical Attributes

2 code implementations27 Jan 2022 Carlos Mougan, Jose M. Alvarez, Salvatore Ruggieri, Steffen Staab

We investigate the interaction between categorical encodings and target encoding regularization methods that reduce unfairness.

Fairness Feature Engineering

Wikidated 1.0: An Evolving Knowledge Graph Dataset of Wikidata's Revision History

1 code implementation9 Dec 2021 Lukas Schmelzeisen, Corina Dima, Steffen Staab

Wikidata is the largest general-interest knowledge base that is openly available.

ProGS: Property Graph Shapes Language (Extended Version)

1 code implementation12 Jul 2021 Philipp Seifer, Ralf Lämmel, Steffen Staab

In RDF representations, this error can be addressed by shape languages such as SHACL or ShEx, which allow for checking whether graphs are valid with respect to a set of domain constraints.

Knowledge Graphs Position +1

Learning Gradual Argumentation Frameworks using Genetic Algorithms

1 code implementation25 Jun 2021 Jonathan Spieler, Nico Potyka, Steffen Staab

As a first proof of concept, we propose a genetic algorithm to simultaneously learn the structure of argumentative classification models.

BIG-bench Machine Learning Interpretable Machine Learning

Pseudo-Riemannian Graph Convolutional Networks

1 code implementation6 Jun 2021 Bo Xiong, Shichao Zhu, Nico Potyka, Shirui Pan, Chuan Zhou, Steffen Staab

Empirical results demonstrate that our method outperforms Riemannian counterparts when embedding graphs of complex topologies.

Graph Reconstruction Inductive Bias +2

Hybrid Physics and Deep Learning Model for Interpretable Vehicle State Prediction

1 code implementation11 Mar 2021 Alexandra Baier, Zeyd Boukhers, Steffen Staab

Physical motion models offer interpretable predictions for the motion of vehicles.

LaHAR: Latent Human Activity Recognition using LDA

1 code implementation23 Nov 2020 Zeyd Boukhers, Danniene Wete, Steffen Staab

Processing sequential multi-sensor data becomes important in many tasks due to the dramatic increase in the availability of sensors that can acquire sequential data over time.

Clustering Human Activity Recognition

MOFA: Modular Factorial Design for Hyperparameter Optimization

no code implementations18 Nov 2020 Bo Xiong, Yimin Huang, Hanrong Ye, Steffen Staab, Zhenguo Li

MOFA pursues several rounds of HPO, where each round alternates between exploration of hyperparameter space by factorial design and exploitation of evaluation results by factorial analysis.

Hyperparameter Optimization Model Selection

Knowledge Graphs

2 code implementations4 Mar 2020 Aidan Hogan, Eva Blomqvist, Michael Cochez, Claudia d'Amato, Gerard de Melo, Claudio Gutierrez, José Emilio Labra Gayo, Sabrina Kirrane, Sebastian Neumaier, Axel Polleres, Roberto Navigli, Axel-Cyrille Ngonga Ngomo, Sabbir M. Rashid, Anisa Rula, Lukas Schmelzeisen, Juan Sequeda, Steffen Staab, Antoine Zimmermann

In this paper we provide a comprehensive introduction to knowledge graphs, which have recently garnered significant attention from both industry and academia in scenarios that require exploiting diverse, dynamic, large-scale collections of data.

Knowledge Graphs

Understanding Social Networks using Transfer Learning

no code implementations16 Oct 2019 Jun Sun, Steffen Staab, Jérôme Kunegis

A detailed understanding of users contributes to the understanding of the Web's evolution, and to the development of Web applications.

Transfer Learning

Observing and Recommending from a Social Web with Biases

no code implementations25 Apr 2016 Steffen Staab, Sophie Stalla-Bourdillon, Laura Carmichael

The research question this report addresses is: how, and to what extent, those directly involved with the design, development and employment of a specific black box algorithm can be certain that it is not unlawfully discriminating (directly and/or indirectly) against particular persons with protected characteristics (e. g. gender, race and ethnicity)?

A Generalized Language Model as the Combination of Skipped n-grams and Modified Kneser-Ney Smoothing

1 code implementation13 Apr 2014 Rene Pickhardt, Thomas Gottron, Martin Körner, Paul Georg Wagner, Till Speicher, Steffen Staab

In an extensive empirical experiment over English text corpora we demonstrate that our generalized language models lead to a substantial reduction of perplexity between 3. 1% and 12. 7% in comparison to traditional language models using modified Kneser-Ney smoothing.

Language Modelling

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