Towards the Annotation of Penn TreeBank with Information Structure
What it is about
Information structure (here the thematicity part of Meaning-Text Theory's communicative structure: Specifier, Theme, Rheme, nested) is missing from the big English treebanks. The authors annotate 435 sentences of the CoNLL-2009 Penn Treebank with a manual procedure, using explicit criteria: fronted adjuncts are Specifiers, the subject is usually the Theme, negated or questioned material is Rheme, and relative pronouns in subject position are Themes. They compare a perceptron sequence tagger with a perceptron transition-based bracketing parser. On 35 test sentences (training on 360) the parser reaches 88.67% token accuracy, against 71.74% for the tagger; labelled bracket score 68.95 against 51.78. Errors are mainly consecutive Themes, consecutive Rhemes, and reduced clauses that are not labelled. Accuracy rises with the training size.
Ideas
- I1. 29. Ellipsis, word order and information structure and
prag: write the paper's criteria as deterministic rules over UD trees:advmod/oblfronted before the root as Specifier,nsubjas Theme, a negated or wh-questioned clause as Rheme. Measure token accuracy on a hand-checked sample of school sentences. - I2. Add a shift-reduce bracketing step to the parse in
en/src/parse.rsonly for the communicative layer, with a rule-based oracle built from I1, so the learning curve can be measured against rules rather than against a learner. - I3. Learning-curve measure: report accuracy for 50, 100, 200 and 360 training sentences, as the paper does, so the claim that small samples are enough is tested on Mova's data.
For Mova
The chapter is 29. Ellipsis, word order and information structure, with 22. Phrases: noun, adjective, adverb and prepositional phrases for the constituents that count as Specifiers. The code is en/src/lin.rs (word order, where Theme comes first) and prag/src/frames.rs. Measure: token accuracy and bracket score for the rule version on a hand-checked sample, run twice. The paper's 435 sentences are not in the card; any test set must be built for Mova.
Cite
@inproceedings{bohnet2013annotation,
title = {{Towards the Annotation of Penn TreeBank with Information Structure}},
author = {Bohnet, Bernd and Burga, Alicia and Wanner, Leo},
booktitle = {Proceedings of the Sixth International Joint Conference on Natural Language Processing},
year = {2013},
url = {https://aclanthology.org/I13-1178/}
}References
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