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user:zeman:treebanks:ro [2012/01/12 17:17]
zeman Sample. |
user:zeman:treebanks:ro [2012/01/12 17:29] (current)
zeman Inside and parsing. |
| ==== Inside ==== | ==== Inside ==== |
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| The corpus contains texts from Portugal and Brazil. The texts were automatically parsed using the PALAVRAS parser (Bick 2000: Eckhard Bick. The Parsing System "Palavras": Automatic Grammatical Analysis of Portuguese in a Constraint Grammar Framework. Dr.phil. thesis. Aarhus University. Aarhus, Denmark: Aarhus University Press. November 2000.) and revised by linguists (the Bosque part, referred here, was totally revised; the other parts of the Floresta sintáctica project were either partially or not at all revised). | Sentences have been segmented into clauses and there is a separate tree for each clause. There are no punctuation nodes, punctuation has been removed. The text lacks diacritical marks, i.e. the Romanian letters //ă, â, î, ş, ţ// have been replaced by //a, a, i, s, t// respectively. |
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| Morphological annotation includes lemmas. In the CoNLL version, the original Floresta tags were converted to fit the ''CPOS'', ''POS'' and ''FEAT'' columns of the CoNLL format. Use [[http://quest.ms.mff.cuni.cz/cgi-bin/interset/index.pl?tagset=pt::conll|DZ Interset]] to inspect the CoNLL tagset. | There are part-of-speech tags but no lemmas and no morphological features (gender, number, case etc.) The part-of-speech tags were probably assigned manually, as well as the syntactic structure. |
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| Multi-word expressions have been concatenated into one token, using underscore as the joining character (e.g. "7_e_Meio", "Hillary_Clinton"). | |
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| ==== Sample ==== | ==== Sample ==== |
| ==== Parsing ==== | ==== Parsing ==== |
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| Bosque is a mildly nonprojective treebank. 2778 of the 212,545 tokens in the CoNLL 2006 version are attached nonprojectively (1.31%). | The corpus is projective. |
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| The results of the CoNLL 2006 shared task are [[http://ilk.uvt.nl/conll/results.html|available online]]. They have been published in [[http://aclweb.org/anthology-new/W/W06/W06-2920.pdf|(Buchholz and Marsi, 2006)]]. The evaluation procedure was non-standard because it excluded punctuation tokens. These are the best results for Portuguese: | |
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| ^ Parser (Authors) ^ LAS ^ UAS ^ | |
| | MST (McDonald et al.) | 86.82 | 91.36 | | |
| | Malt (Nivre et al.) | 87.60 | 91.22 | | |
| | Nara (Yuchang Cheng) | 85.07 | 90.30 | | |
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| | I am not aware of any published evaluation of parsing accuracy on this data. |
