As of September 2022, the KRR group is going to continue as two separate groups, the Learning and Reasoning (L&R) group, and the Knowledge in AI group. The preliminary page of the new L&R group is at Learning and reasoning (

The Learning & Reasoning group studies the ways machine learning, symbolic knowledge and formal reasoning can interact to enhance one another, based on the premise that inductive data-driven learning and deductive knowledge-based reasoning have complementary strengths and weaknesses.  

A vast amount of the world’s data and knowledge is relational in nature. By designing machine learning methods that consume such symbolic, relational knowledge or interact with formal reasoning methods, it becomes possible to discover new knowledge, to detect mistakes in existing knowledge, and to develop alternative forms of inference. 

In the other direction, the use of prior knowledge can improve machine learning methods by reducing the need for huge amounts of data and computing resources, and by making machine learning models more generalisable and interpretable. We study how symbolic methods can be used to represent such prior knowledge, and how formal reasoning can be combined with learning to achieve the best of both worlds.

We apply our results in a variety of different domains, with a particular emphasis on medicine and scientific discovery. 

The group will be lead by Prof. Dr. Frank van Harmelen.