Download Advances in Natural Language Processing: 7th International by Jan Hajič (auth.), Hrafn Loftsson, Eiríkur Rögnvaldsson, PDF

By Jan Hajič (auth.), Hrafn Loftsson, Eiríkur Rögnvaldsson, Sigrún Helgadóttir (eds.)

This publication constitutes the complaints of the seventh foreign convention on Advances in usual Language Processing held in Reykjavik, Iceland, in August 2010.

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Extra info for Advances in Natural Language Processing: 7th International Conference on NLP, IceTAL 2010, Reykjavik, Iceland, August 16-18, 2010

Example text

Defentsa d. itzala 7 a. unibertsora b. izarrera c. galaxiara d. espaziora 8 a. kostu b. prezio c. eragozpen d. zailtasun The process of generating and analysing the questions consists of the following steps: – Selection of the texts: experts on the generation of didactic resources selected the texts on an specific domain, taking into account the level of the learners and the length of the texts. – Marking the blanks: the terms to be considered as keys had to be relevant within the text. The marking was carried out manually.

Actually the results presented in the previous section clearly suggest that a combination of both approaches (rule-based for the in-domain sentence and CRFs for the out-of-domain ones) would very much increase the overall performance of the system. Moreover, the relative importance of both approaches depends on the particular domain evaluated. 2 a division in-domain versus out-of-domain sentences of 80/20 was detailed. This percentage is very much dependant on the domain and the particular coverage of the ECA application.

Thus, a new parse tree sequence representation is proposed. The problem of reranking parsing results is therefore reduced to a word-category assignment: the new problem is to find the best assignment for the whole sentence, which is a typical sequence labeling problem. ) – 2 additional labels: • One to describe the lexical items not included in the best alternative. • One to identify the lexical items not included in the best alternative abut located in the middle of two partial sequences. 2 New Problem Characteristics The reranking approach described in this paper is conditioned by the following issues: – The parser handles a mixture of syntactic and semantic lexical categories and grammar production rules, with overlapping syntactic-semantic alternative trees.

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