Abstract:
The development of effective techniques for knowledge representation and reasoning
(KRR) is a crucial aspect of successful intelligent systems. Different representation
paradigms, as well as their use in dedicated reasoning systems, have been extensively
studied in the past. Nevertheless, new challenges, problems, and issues have emerged
in the context of knowledge representation in Artificial Intelligence (AI), involving the
logical manipulation of increasingly large information sets (see for example Semantic
Web, BioInformatics, and so on). Improvements in storage capacity and performance
of computing infrastructure have also affected the nature of KRR systems, shifting their
focus towards representational power and execution performance. Therefore, KRR
research is faced with the challenge of developing knowledge representation structures
optimized for large-scale reasoning. This new generation of KRR systems includes
graph-based knowledge representation formalisms such as Constraint Networks (CNs),
Bayesian Networks (BNs), Semantic Networks (SNs), Conceptual Graphs (CGs),
Formal Concept Analysis (FCA), CP-nets, GAI-nets, and Argumentation Frameworks,
all of which have been successfully used in a number of applications. The goal of the
workshop series on Graph Structures for Knowledge Representation and Reasoning
(GKR) is to bring together researchers involved in the development and application of
graph-based knowledge representation formalisms and reasoning techniques.
This volume contains extended and revised selected papers of the sixth edition of
GKR, under the auspices of ScaDS.AI – Center for Scalable Data Analytics and
Artificial Intelligence Dresden/Leipzig, which took place jointly with ECAI 2020, the
24th European Conference on Artificial Intelligence, which was supposed to be held in
Santiago de Compostela, Spain. Like ECAI, GKR had to be re-shaped into a virtual
edition, given the global pandemic. This was a first, compared to previous editions of
GKR held in Pasadena, USA (2009), Barcelona, Spain (2011), Beijing, China (2013),
Buenos Aires, Argentina (2015), and Melbourne, Australia (2017). Still, like before,
thanks to the association with a major international AI conference, the workshop
provided the perfect venue for a rich and valuable exchange. As usual, the workshop
submissions underwent single-blind reviewing by the program committee, each
receiving between two and three reviews. On top of the extended workshop papers, this
volume also contains two invited additional contributions from core GKR community
members.