← Go back

KnowGraphs

Alumni project (October 2017 - September 2023)

Knowledge Graphs at Scale

About the project

KnowGraphs addresses the problem of scaling up the use of knowledge graphs. 15 Early Stage Researchers (ESRs) will addresses challenges pertaining to the representation, creation, management and utilization of knowledge graphs. 7 beneficiaries and 7 associated partners will facilitate the career development of the ESRs through mentoring, workshops, winter schools and dedicated training. Open positions can be found here.
Funding program
KnowGraphs is an Innovative Training Network and received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 860801.

Publications

Fact Checking Knowledge Graphs - A Survey

By Umair Qudus, Michael Röder, Muhammad Saleem, Axel-Cyrille Ngonga Ngomo

ACM Comput. Surv., 2025, #article

Ontolearn---A Framework for Large-scale OWL Class Expression Learning in Python

By Caglar Demir, Alkid Baci, N'Dah Jean Kouagou, Leonie Nora Sieger, Stefan Heindorf, Simon Bin, Lukas Blübaum, Alexander Bigerl, Axel-Cyrille Ngonga Ngomo

Journal of Machine Learning Research, JMLR, 2025, #article

FaVEL: Fact Validation Ensemble Learning

By Umair Qudus, Franck Lionel Tatkeu Pekarou, Ana Alexandra Morim da Silva, Michael Röder, Axel-Cyrille Ngonga Ngomo

Knowledge Engineering and Knowledge Management - 24th International Conference, EKAW 2024, Amsterdam, The Netherlands, November 26-28, 2024, Proceedings, 2024, #inproceedings

ROCES: Robust Class Expression Synthesis in Description Logics via Iterative Sampling

By N'Dah Jean Kouagou, Stefan Heindorf, Caglar Demir, Axel-Cyrille Ngonga Ngomo

Proceedings of the Thirty-Third International Joint Conference on Artificial Intelligence, IJCAI-24, 2024, #inproceedings

Evaluating Negation with Multi-way Joins Accelerates Class Expression Learning

By Nikolaos Karalis, Alexander Bigerl, Caglar Demir, Liss Heidrich, Axel-Cyrille Ngonga Ngomo

Machine Learning and Knowledge Discovery in Databases. Research Track - European Conference, ECML PKDD 2024, Vilnius, Lithuania, September 9-13, 2024, Proceedings, Part VI, 2024, #inproceedings

Universal Knowledge Graph Embeddings

By N'Dah Jean Kouagou, Caglar Demir, Hamada M. Zahera, Adrian Wilke, Stefan Heindorf, Jiayi Li, Axel-Cyrille Ngonga Ngomo

Companion Proceedings of the ACM on Web Conference 2024, 2024, #inproceedings

ExPrompt: Augmenting Prompts Using Examples as Modern Baseline for Stance Classification

By Umair Qudus, Michael Röder, Daniel Vollmers, Axel-Cyrille Ngonga Ngomo

Conference on Information and Knowledge Management -- CIKM 2024, 2024, #inproceedings

BLINK: Blank Node Matching Using Embeddings

By Alexander Becker, Mohamed Ahmed Sherif, Axel-Cyrille Ngonga Ngomo

The Semantic Web -- ISWC 2024, 2024, #inproceedings

Efficient Updates for Worst-Case Optimal Join Triple Stores

By Alexander Bigerl, Liss Heidrich, Nikolaos Karalis, Axel-Cyrille Ngonga Ngomo

The Semantic Web -- ISWC 2024, 2024, #inproceedings

Neural Class Expression Synthesis (Extended Abstract)

By N'Dah Jean Kouagou, Stefan Heindorf, Caglar Demir, Axel-Cyrille Ngonga Ngomo

NeSy 2023, 17th International Workshop on Neural-Symbolic Learning and Reasoning, Certosa di Pontignano, Siena, Italy, 2023, #inproceedings

Neuro-Symbolic Class Expression Learning

By Caglar Demir, Axel-Cyrille Ngonga Ngomo

The 32nd International Joint Conference on Artificial Intelligence, IJCAI 2023, 2023, #inproceedings

Neural Class Expression Synthesis in ALCHIQ(D)

By N'Dah Jean Kouagou, Stefan Heindorf, Caglar Demir, Axel-Cyrille Ngonga Ngomo

Machine Learning and Knowledge Discovery in Databases, 2023, #inproceedings

TEMPORALFC: A Temporal Fact Checking approach over Knowledge Graphs

By Umair Qudus, Michael Röder, Sabrina Kirrane, Axel-Cyrille Ngonga Ngomo

The Semantic Web -- ISWC 2023, 2023, #inproceedings

Neural Class Expression Synthesis

By N'Dah Jean Kouagou, Stefan Heindorf, Caglar Demir, Axel-Cyrille Ngonga Ngomo

The Semantic Web - 20th International Conference, ESWC 2023, Hersonissos, Crete, Greece, May 28 - June 1, 2023, Proceedings, 2023, #inproceedings

REDFM: a Filtered and Multilingual Relation Extraction Dataset

By ‪Pere-Lluís Huguet Cabot, Simone Tedeschi, Axel-Cyrille Ngonga Ngomo, Roberto Navigli

Proceedings of the 61st Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers), 2023, #inproceedings

Clifford Embeddings – A Generalized Approach for Embedding in Normed Algebras

By Caglar Demir, Axel-Cyrille Ngonga Ngomo

European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases, ECML PKDD 2023, 2023, #inproceedings

Native Execution of GraphQL Queries over RDF Graphs Using Multi-way Joins

By Nikolaos Karalis, Alexander Bigerl, Axel-Cyrille Ngonga Ngomo

SEMANTiCS, 2023, #inproceedings

HybridFC: A Hybrid Fact-Checking Approach for Knowledge Graphs

By Umair Qudus, Michael Röder, Muhammad Saleem, Axel-Cyrille Ngonga Ngomo

The Semantic Web -- ISWC 2022, 2022, #inproceedings

Learning Concept Lengths Accelerates Concept Learning in ALC

By N'Dah Jean Kouagou, Stefan Heindorf, Caglar Demir, Ngonga Axel-Cyrille Ngomo

ESWC, 2022, #inproceedings

ADAGIO - Automated Data Augmentation of Knowledge Graphs Using Multi-expression Learning

By Kevin Dreßler, Mohamed Ahmed Sherif, Axel-Cyrille Ngonga Ngomo

Proceedings of the 33rd ACM Conference on Hypertext and Hypermedia, 2022, #inproceedings

LAUREN - Knowledge Graph Summarization for Question Answering

By Rricha Jalota, Daniel Vollmers, Diego Moussallem, Axel-Cyrille Ngonga Ngomo

Proceedings of the 15th IEEE International Conference on Semantic Computing (ICSC 2021), 2021, #inproceedings

Multilingual Verbalization and Summarization for Explainable Link Discovery

By Abdullah Fathi Ahmed, Mohamed Ahmed Sherif, Diego Moussallem, Axel-Cyrille Ngonga Ngomo

Data & Knowledge Engineering, 2021, #article

LIMES - A Framework for Link Discovery on the Semantic Web

By Axel-Cyrille Ngonga Ngomo, Mohamed Ahmed Sherif, Kleanthi Georgala, Mofeed Hassan, Kevin Dreßler, Klaus Lyko, Daniel Obraczka, Tommaso Soru

KI - Künstliche Intelligenz, German Journal of Artificial Intelligence - Organ des Fachbereichs "Künstliche Intelligenz" der Gesellschaft für Informatik e.V., 2021, #article

Applying Grammar-based Compression to RDF

By Michael Röder, Philip Frerk, Felix Conrads, Axel-Cyrille Ngonga Ngomo

Eighteenth Extended Semantic Web Conference - Research Track, 2021, #inproceedings

Relicensing Combined Datasets

By Adrian Wilke, Arwa Bannoura, Axel-Cyrille Ngonga Ngomo

Proceedings of the 15th IEEE International Conference on Semantic Computing (ICSC 2021), 2021, #inproceedings

LIGER -- Link Discovery with Partial Recall

By Kleanthi Georgala, Mohamed Ahmed Sherif, Axel-Cyrille Ngonga Ngomo

Proceedings of Ontology Matching Workshop 2020, 2020, #inproceedings

LIGON -- Link Discovery with Noisy Oracles

By Mohamed Ahmed Sherif, Kevin Dreßler, Axel-Cyrille Ngonga Ngomo

Proceedings of Ontology Matching Workshop 2020, 2020, #inproceedings

Applying edge-counting semantic similarities to Link Discovery: Scalability and Accuracy

By Kleanthi Georgala, Michael Röder, Mohamed Ahmed Sherif, Axel-Cyrille Ngonga Ngomo

Proceedings of Ontology Matching Workshop 2020, 2020, #inproceedings

NABU - Multilingual Graph-Based Neural RDF Verbalizer

By Diego Moussallem, Dwaraknath Gnaneshwar, Thiago Castro Ferreira, Axel-Cyrille Ngonga Ngomo

The Semantic Web - ISWC 2020 - 19th International Semantic Web Conference, Athens, Greece, November 2-6, 2020, Proceedings, Part I, 2020, #inproceedings

ProBERT: Product Data Classification with Fine-tuning BERT Model

By Hamada M. Zahera, Mohamed Ahmed Sherif

Proceedings of Mining the Web of HTML-embedded Product Data Workshop (MWPD2020), 2020, #inproceedings

Fact Checking Knowledge Graphs - A Survey

By Umair Qudus, Michael Röder, Muhammad Saleem, Axel-Cyrille Ngonga Ngomo

ACM Comput. Surv., 2025, #article

Ontolearn---A Framework for Large-scale OWL Class Expression Learning in Python

By Caglar Demir, Alkid Baci, N'Dah Jean Kouagou, Leonie Nora Sieger, Stefan Heindorf, Simon Bin, Lukas Blübaum, Alexander Bigerl, Axel-Cyrille Ngonga Ngomo

Journal of Machine Learning Research, JMLR, 2025, #article

FaVEL: Fact Validation Ensemble Learning

By Umair Qudus, Franck Lionel Tatkeu Pekarou, Ana Alexandra Morim da Silva, Michael Röder, Axel-Cyrille Ngonga Ngomo

Knowledge Engineering and Knowledge Management - 24th International Conference, EKAW 2024, Amsterdam, The Netherlands, November 26-28, 2024, Proceedings, 2024, #inproceedings

ROCES: Robust Class Expression Synthesis in Description Logics via Iterative Sampling

By N'Dah Jean Kouagou, Stefan Heindorf, Caglar Demir, Axel-Cyrille Ngonga Ngomo

Proceedings of the Thirty-Third International Joint Conference on Artificial Intelligence, IJCAI-24, 2024, #inproceedings

Evaluating Negation with Multi-way Joins Accelerates Class Expression Learning

By Nikolaos Karalis, Alexander Bigerl, Caglar Demir, Liss Heidrich, Axel-Cyrille Ngonga Ngomo

Machine Learning and Knowledge Discovery in Databases. Research Track - European Conference, ECML PKDD 2024, Vilnius, Lithuania, September 9-13, 2024, Proceedings, Part VI, 2024, #inproceedings