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Comparison of part-of-speech tagging systems

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{|class=wikitable
 
{|class=wikitable
!rowspan=2|Language !!colspan=2|Corpus !!colspan=6|System
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!rowspan=2|Language !!colspan=3|Corpus !!colspan=6|System
 
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! Sent !! Tok !! 1st !! CG+1st !! Unigram || CG+Unigram || apertium-tagger || CG+apertium-tagger
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! Sent !! Tok !! Amb !! 1st !! CG+1st !! Unigram || CG+Unigram || apertium-tagger || CG+apertium-tagger
 
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| Catalan || 1,413 || 24,144 || 81.85 || 83.96 || [75.65, 78.46]|| [87.76, 90.48] || [94.16, 96.28] || [93.92, 96.16]
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| Catalan || 1,413 || 24,144 || ? || 81.85 || 83.96 || [75.65, 78.46]|| [87.76, 90.48] || [94.16, 96.28] || [93.92, 96.16]
 
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| Spanish || 1,271 || 21,247 || 86.18 || 86.71 || [78.20, 80.06] || [87.72, 90.27] || [90.15, 94.86] || [91.84, 93.70]
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| Spanish || 1,271 || 21,247 || ?|| 86.18 || 86.71 || [78.20, 80.06] || [87.72, 90.27] || [90.15, 94.86] || [91.84, 93.70]
 
|-
 
|-
| Serbo-Croatian || 1,190 || 20,128 || 75.22 || 79.67 || [75.36, 78.79] || [75.36, 77.28] || ||
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| Serbo-Croatian || 1,190 || 20,128 || ?|| 75.22 || 79.67 || [75.36, 78.79] || [75.36, 77.28] || ||
 
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| Russian || 451 || 10,171 || 75.63 || 79.52 || [70.49, 72.94] || [74.68, 78.65] || n/a || n/a
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| Russian || 451 || 10,171 || ?|| 75.63 || 79.52 || [70.49, 72.94] || [74.68, 78.65] || n/a || n/a
 
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| Kazakh || 403 || 4,348 || 80.25 || 86.13 || [83.55, 86.19] || [83.33, 86.61] || n/a || n/a
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| Kazakh || 403 || 4,348 || ? || 80.25 || 86.13 || [83.55, 86.19] || [83.33, 86.61] || n/a || n/a
 
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Sent = sentences, Tok = tokens, Amb = average ambiguity from the morphological analyser
   
 
==Systems==
 
==Systems==

Revision as of 11:47, 25 December 2015

Contents

Apertium would like to have really good part-of-speech tagging, but in many cases falls below the state-of-the-art (around 97% tagging accuracy). This page intends to collect a comparison of tagging systems in Apertium and give some ideas of what could be done to improve them.

In the following table, the intervals represent the [low, high] values from 10-fold cross validation.

Language Corpus System
Sent Tok Amb 1st CG+1st Unigram CG+Unigram apertium-tagger CG+apertium-tagger
Catalan 1,413 24,144  ? 81.85 83.96 [75.65, 78.46] [87.76, 90.48] [94.16, 96.28] [93.92, 96.16]
Spanish 1,271 21,247  ? 86.18 86.71 [78.20, 80.06] [87.72, 90.27] [90.15, 94.86] [91.84, 93.70]
Serbo-Croatian 1,190 20,128  ? 75.22 79.67 [75.36, 78.79] [75.36, 77.28]
Russian 451 10,171  ? 75.63 79.52 [70.49, 72.94] [74.68, 78.65] n/a n/a
Kazakh 403 4,348  ? 80.25 86.13 [83.55, 86.19] [83.33, 86.61] n/a n/a

Sent = sentences, Tok = tokens, Amb = average ambiguity from the morphological analyser

Systems

  • 1st: Selects the first analysis from the morphological analyser
  • CG: Uses the CG (from the monolingual language package in languages) to preprocess the input.
  • Unigram: Lexicalised unigram tagger
  • apertium-tagger: Uses the bigram HMM tagger included with Apertium.

Corpora

The tagged corpora used in the experiments are found in the monolingual packages in languages, under the texts/ subdirectory.

Todo

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