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Online learning of event definitions

Published online by Cambridge University Press:  14 October 2016

NIKOS KATZOURIS ,
ALEXANDER ARTIKIS  and
GEORGIOS PALIOURAS
NIKOS KATZOURIS
Affiliation:
Department of Informatics & Telecommunications, National Kapodistrian University of Athens, Athens, Greece (e-mail: [email protected]) Institute of Informatics & Telecommunications, National Center for Scientific Research “Demokritos”, Athens, Greece (e-mail: [email protected])
ALEXANDER ARTIKIS
Affiliation:
Department of Maritime Studies, University of Piraeus, Piraeus, Greece (e-mail: [email protected]) Institute of Informatics & Telecommunications, National Center for Scientific Research “Demokritos”, Athens, Greece (e-mail: [email protected])
GEORGIOS PALIOURAS
Affiliation:
Institute of Informatics & Telecommunications, National Center for Scientific Research “Demokritos”, Athens, Greece (e-mail: [email protected])
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Abstract

Systems for symbolic event recognition infer occurrences of events in time using a set of event definitions in the form of first-order rules. The Event Calculus is a temporal logic that has been used as a basis in event recognition applications, providing among others, direct connections to machine learning, via Inductive Logic Programming (ILP). We present an ILP system for online learning of Event Calculus theories. To allow for a single-pass learning strategy, we use the Hoeffding bound for evaluating clauses on a subset of the input stream. We employ a decoupling scheme of the Event Calculus axioms during the learning process, that allows to learn each clause in isolation. Moreover, we use abductive-inductive logic programming techniques to handle unobserved target predicates. We evaluate our approach on an activity recognition application and compare it to a number of batch learning techniques. We obtain results of comparable predicative accuracy with significant speed-ups in training time. We also outperform hand-crafted rules and match the performance of a sound incremental learner that can only operate on noise-free datasets.

Keywords

Inductive Logic ProgrammingEvent CalculusOnline Learning
Type
Regular Papers
Information
Theory and Practice of Logic Programming , Volume 16 , Special Issue 5-6: 32nd International Conference on Logic Programming , September 2016 , pp. 817 - 833
Copyright
Copyright © Cambridge University Press 2016 

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