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Preface

Martin, Andreas; Hinkelmann, Knut; Gerber, Aurona; Lenat, Doug; van Harmelen, Frank;

Clark, Peter

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AAAI 2019 Spring Symposium on Combining Machine Learning with Knowledge Engineering 2019

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Martin, A., Hinkelmann, K., Gerber, A., Lenat, D., van Harmelen, F., & Clark, P. (2019). Preface: Combining machine learning with knowledge engineering (AAAI-Make 2019). In A. Martin (Ed.), AAAI 2019 Spring Symposium on Combining Machine Learning with Knowledge Engineering: Proceedings of the AAAI 2019 Spring Symposium on Combining Machine Learning with Knowledge Engineering (AAAI-MAKE 2019). Stanford University, Palo Alto, California, USA, March 25-27, 2019 (CEUR Workshop Proceedings; Vol. 2350). CEUR-WS. http://ceur-ws.org/Vol-2350/xpreface.pdf

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Preface: Combining Machine Learning with Knowledge Engineering

(AAAI-MAKE 2019)

Andreas Martin

_{, Knut Hinkelmann}

_{, Aurona Gerber}

_{, Doug Lenat}

_{, Frank van Harmelen}

_{and Peter Clark}

1_{FHNW University of Applied Sciences and Arts Northwestern Switzerland, School of Business, Olten, Switzerland} 2_{University of Pretoria, Department of Informatics, Pretoria, South Africa}

3_{Cycorp Inc., Austin, TX, USA}

4_{VU University, Department of Computer Science, Amsterdam, Netherlands} 5_{Allen Institute for Artificial Intelligence, Seattle, WA, USA}

The AAAI 2019 spring symposium on combining ma-chine learning with knowledge engineering, which was held at Stanford University, Palo Alto, California, USA, from 25 to 27 March 2019, brought together researchers and practi-tioners from various communities working together on joint AI that is explainable, compliant and grounded in domain knowledge.

The symposium aimed to combine machine learning with knowledge engineering. Machine learning helps to solve complex tasks based on real-world data instead of pure in-tuition. It is most suitable for building AI systems when knowledge is not known, or knowledge is tacit. Many busi-ness cases and real-life scenarios using machine learning methods, however, demand explanations of results and be-haviour. This is particularly the case where decisions can have serious consequences. Furthermore, application areas such as banking, insurance and medicine, are highly regu-lated and require compliance with law and regulations. This specific application knowledge cannot be learned but needs to be represented, which is the area of knowledge engineer-ing.

Knowledge engineering, on the other hand, is appropri-ate for representing expert knowledge, which people are aware of and that has to be considered for compliance rea-sons or explanations. Knowledge-based systems that make knowledge explicit are often based on logic and thus can explain their conclusions. These systems typically require a higher initial effort during development than systems that use machine learning approaches. However, symbolic ma-chine learning and ontology learning approaches are promis-ing for reducpromis-ing the effort of knowledge engineerpromis-ing.

Because of their complementary strengths and weak-nesses, there is an increasing demand for the integration of knowledge engineering and machine learning. Conclusively, recent results indicate that explicitly represented application knowledge could assist data-driven machine-learning approaches to converge faster on sparse data and to be more robust against noise.

Copyright held by the author(s). In A. Martin, K. Hinkelmann, A. Gerber, D. Lenat, F. van Harmelen, P. Clark (Eds.), Proceedings of the AAAI 2019 Spring Symposium on Combining Machine Learn-ing with Knowledge EngineerLearn-ing (AAAI-MAKE 2019). Stanford University, Palo Alto, California, USA, March 25-27, 2019.

The over 70 participants of the AAAI-MAKE symposium contributed to the intense discussion during the presenta-tion of the 28 posipresenta-tion and full papers, and four posters and demonstrations.

Most notably, the participants had the opportunity to at-tend several keynotes. On the first day, Doug Lenat em-phasised a need for a more expressive logic language in his keynote presentation. He gave a recap on the Cyc based and showed ways to connect knowledge-based systems with machine learning. Then on the second day, Frank van Harmelen showed the limitations of machine learning, in particular in areas where not much knowledge is available like the recognition of rare diseases. He introduced the concept of boxology to represent the re-usable architec-tural patterns for combining learning and reasoning.

In the plenary session on day two, Aurona Gerber gave a short and witty overview of the AAAI-MAKE symposium by using the analogy to Asterix.