Abstract
The Open Knowledge Extraction (OKE) challenge, at its second edition, has the ambition to provide a reference framework for research on Knowledge Extraction from text for the Semantic Web by re-defining a number of tasks (typically from information and knowledge extraction), taking into account specific SW requirements. The OKE challenge defines two tasks: (1) Entity Recognition, Linking and Typing for Knowledge Base population; (2) Class Induction and entity typing for Vocabulary and Knowledge Base enrichment. Task 1 consists of identifying Entities in a sentence and create an OWL individual representing it, link to a reference KB (DBpedia) when possible and assigning a type to such individual. Task 2 consists in producing rdf:type statements, given definition texts. The participants will be given a dataset of sentences, each defining an entity (known a priori). The following systems participated to the challenge: WestLab to both Task 1 and 2, ADEL and Mannheim to Task 2 only. In this paper we describe the OKE challenge, the tasks, the datasets used for training and evaluating the systems, the evaluation method, and obtained results.
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Notes
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The prefix dul: stands for the namespace http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#.
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The prefixes nif:, itsrdf:, dul:, and dbpedia: identify the namespaces http://persistence.uni-leipzig.org/nlp2rdf/ontologies/nif-core#, http://www.w3.org/2005/11/its/rdf#, http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#, and http://dbpedia.org/resource/ respectively.
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Prefixes d0: and dul: stand for namespaces http://ontologydesignpatterns.org/ont/wikipedia/d0.owl# and http://www.ontologydesignpatterns.org/ont/dul/DUL.owl# respectively.
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A preview of the job can be found at https://tasks.crowdflower.com/channels/cf_internal/jobs/913913/editor_preview.
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The training dataset is available at https://github.com/anuzzolese/oke-challenge-2016/blob/master/GoldStandard_sampleData/task1/dataset_task_1.ttl. Similarly, the evaluation dataset is available at https://github.com/anuzzolese/oke-challenge-2016/blob/master/evaluation-data/task1/evaluation-dataset-task1.ttl.
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The training dataset is available at https://github.com/anuzzolese/oke-challenge-2016/blob/master/GoldStandard_sampleData/task2/dataset_task_2.ttl. Similarly, the evaluation dataset is available at https://github.com/anuzzolese/oke-challenge-2016/blob/master/evaluation-data/task2/evaluation-dataset-task2.ttl.
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Nuzzolese, A.G., Gentile, A.L., Presutti, V., Gangemi, A., Meusel, R., Paulheim, H. (2016). The Second Open Knowledge Extraction Challenge. In: Sack, H., Dietze, S., Tordai, A., Lange, C. (eds) Semantic Web Challenges. SemWebEval 2016. Communications in Computer and Information Science, vol 641. Springer, Cham. https://doi.org/10.1007/978-3-319-46565-4_1
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