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- item-1 hasContent milena-yankova.
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- 348 creator martin-emms.
- 348 type InProceedings.
- 348 label "Tree Distance and Some Other Variants of Evalb".
- 348 sameAs 348.
- 348 abstract "Some alternatives to the standard evalb measures for parser evaluation are considered, principally the use of a tree-distance measure, which assigns a score to a linearity and ancestry respecting mapping between trees, in contrast to the evalb measures, which assign a score to a span preserving mapping. Additionally, analysis of the evalb measures suggests some further variants, concerning different normalisations, the portions of a tree compared and whether scores should be micro or macro averaged. The outputs of 6 parsing systems on Section 23 of the Penn Treebank were taken. It is shown that the ranking of the parsing systems varies as the alternative evaluation measures are used. For a fixed parsing system, it is also shown that the ranking of the parses from best to worst will vary according to whether the evalb or tree-distance measure is used. It is argued that the tree-distance measure ameliorates a problem that has been noted concerning over-penalisation of attachment errors.".
- 348 hasAuthorList authorList.
- 348 hasTopic Linguistics.
- 348 isPartOf proceedings.
- 348 keyword "Evaluation methodologies".
- 348 keyword "Parsing Systems".
- 348 keyword "Syntax".
- 348 title "Tree Distance and Some Other Variants of Evalb".
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- item-1 hasContent martin-emms.
- 349 creator bernd-kiefer.
- 349 creator berthold-crysmann.
- 349 creator dan-flickinger.
- 349 creator peter-adolphs.
- 349 creator stephan-oepen.
- 349 creator ulrich-callmeier.
- 349 type InProceedings.
- 349 label "Some Fine Points of Hybrid Natural Language Parsing".
- 349 sameAs 349.
- 349 abstract "Large-scale grammar-based parsing systems nowadays increasingly rely on independently developed, more specialized components for pre-processing their input. However, different tools make conflicting assumptions about very basic properties such as tokenization. To make linguistic annotation gathered in pre-processing available to deep parsing, a hybrid NLP system needs to establish a coherent mapping between the two universes. Our basic assumption is that tokens are best described by attribute value matrices (AVMs) that may be arbitrarily complex. We propose a powerful resource-sensitive rewrite formalism, chart mapping , that allows us to mediate between the token descriptions delivered by shallow pre-processing components and the input expected by the grammar. We furthermore propose a novel way of unknown word treatment where all generic lexical entries are instantiated that are licensed by a particular token AVM. Again, chart mapping is used to give the grammar writer full control as to which items (e.g. native vs. generic lexical items) enter syntactic parsing. We discuss several further uses of the original idea and report on early experiences with the new machinery.".
- 349 hasAuthorList authorList.
- 349 hasTopic Linguistics.
- 349 isPartOf proceedings.
- 349 keyword "Parsing Systems".
- 349 keyword "Tools, systems, applications".
- 349 title "Some Fine Points of Hybrid Natural Language Parsing".
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- item-1 hasContent peter-adolphs.
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- 35 creator m-antonia-marti.
- 35 creator mariona-taule.
- 35 creator marta-recasens.
- 35 type InProceedings.
- 35 label "AnCora: Multilevel Annotated Corpora for Catalan and Spanish".
- 35 sameAs 35.
- 35 abstract "This paper presents AnCora, a multilingual corpus annotated at different linguistic levels consisting of 500,000 words in Catalan (AnCora-Ca) and in Spanish (AnCora-Es). At present AnCora is the largest multilayer annotated corpus of these languages freely available from http://clic.ub.edu/ancora. The two corpora consist mainly of newspaper texts annotated at different levels of linguistic description: morphological (PoS and lemmas), syntactic (constituents and functions), and semantic (argument structures, thematic roles, semantic verb classes, named entities, and WordNet nominal senses). All resulting layers are independent of each other, thus making easier the data management. The annotation was performed manually, semiautomatically, or fully automatically, depending on the encoded linguistic information. The development of these basic resources constituted a primary objective, since there was a lack of such resources for these languages. A second goal was the definition of a consistent methodology that can be followed in further annotations. The current versions of AnCora have been used in several international evaluation competitions".
- 35 hasAuthorList authorList.
- 35 hasTopic Linguistics.
- 35 isPartOf proceedings.
- 35 keyword "Corpus (creation, annotation, etc.)".
- 35 keyword "LR national/international projects, organizational/policy issues".
- 35 keyword "Standards for LRs".
- 35 title "AnCora: Multilevel Annotated Corpora for Catalan and Spanish".
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