Consensus-based Approach for Keyword Extraction from Urban Events Collections

Advances in Distributed Computing and Artificial Intelligence Journal

Ana OLIVEIRA ALVES¹  Bernardete RIBEIRO² 

[1] Centre of Informatics and Systems, University of Coimbra, Portugal& Polytechnic Institute of Coimbra, Portugal;Department of Informatics Engineering, University of Coimbra, Portugal;

关键词: ensemble learning;    keyword extraction;    conditional ran-dom fields (crf);   

DOI  :  10.14201/ADCAIJ2015424160

来源: DOAJ

【 摘 要 】

Automatic keyword extraction (AKE) from textual sources took a valuable step towards harnessing the problem of efficient scanning of large document collections. Particularly in the context of urban mobility, where the most relevant events in the city are advertised on-line, it becomes difficult to know exactly what is happening in a place.

In this paper we tackle this problem by extracting a set of keywords from different kinds of textual sources, focusing on the urban events context. We propose an ensemble of automatic keyword extraction systems KEA (Key-phrase Extraction Algorithm) and KUSCO (Knowledge Unsupervised Search for instantiating Concepts on lightweight Ontologies) and Conditional Random Fields (CRF).

Unlike KEA and KUSCO which are well-known tools for automatic keyword extraction, CRF needs further pre-processing. Therefore, a tool for handling AKE from the documents using CRF is developed. The architecture for the AKE ensemble system is designed and efficient integration of component applications is presented in which a consensus between such classifiers is achieved. Finally, we empirically show that our AKE ensemble system significantly succeeds on baseline sources and urban events collections.

【 授权许可】

Unknown