Tools for annotating texts and exploiting annotation (TXM). ⢠Support research on reference in discourse ... Automated discourse analysis, NLP, deep learning. 3 ...
Textometric Exploitation of Coreference-annotated Corpora with TXM Methodological Choices and First Outcomes Matthieu Quignard (CNRS/ICAR, Lyon) Serge Heiden (ENS/IHRIM, Lyon) Frédéric Landragin (CNRS/LATTICE, Paris) Matthieu Decorde (ENS/IHRIM, Lyon)
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Co-reference ?
We had dinner yesterday evening with Serge and Pascal. They were very joyful. > [They] refers to two people, Serge and Pascal > [They] and [Serge and Pascal] corefer. > [They] [Serge and Pascal] is an anaphora The wine was delicious. > [The wine] does not stricty refer to the dinner but to the wine served at dinner (implicit) > [The wine] [the dinner] is an associative anaphora
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The DEMOCRAT Project
• 3 French partners LATTICE (Paris), LILPA (Strasbourg), IHRIM-ICAR (Lyon)
• 48 months • A manually annotated corpus of French written texts, from 9th century to the 21st ; 1 million words (actually less) ; balanced between narrative and non narrative texts (essays…). • Tools for annotating texts and exploiting annotation (TXM) • Support research on reference in discourse and discourse processing – Theory of reference (Landragin, Schnedecker) – Automated discourse analysis, NLP, deep learning 3
Annotation principles
• Units – Relations – Schemata (URS, cf. Glozz) • Units – segments of text referring to a given character, idea, concept…
• Relations – Units in relation which each other, e.g. anaphora
• Schema – Sets of units coreffering to the same object = coreferring chains
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Annotation principles
• Units – Relations – Schemata (URS) • Units – segments of text referring to a given character, idea, concept…
• Relations – Units in relation which each other, e.g. anaphora
• Schema – Sets of units coreffering to the same object = coreferring chains
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The « Unitizing » Task
• The annotator must do the following operations – Decide whether an object has been mentionned or not ◦ Some pronouns are not referential (one, nobody…) – Delimitate the segment of text that mentions that object ◦ The segment has to be contiguous ◦ Long enough (whole noun phrase) ◦ The preposition should keep outside – Give a name to the referent and use the same name in all coreferring mentions
• NB : There are overlapping segments : [[my]i computer]j 6
TXM as an annotation framework http://textometrie.org • TXM is well known for exploiting, investigating corpora – – – –
frequencies concordancer charts with R progressions…
• An extension has been developped for DEMOCRAT : ANALEC – Online annotation – Integration of the URS structure of annotation over the XML structure of the document itself – Online exploitation of the annotation as a means of verification tool (quality measurement)
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Annotation
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Annotation Units
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Annotation
Unit properties
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Concordancer
Calling all units coreferring to the same referent = a view of a referring chain as a sequence of units
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Concordancer
Calling all units coreferring to the same referent = a view of a referring chain as a sequence of units
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Histogram
• Common pattern – Definite NP• (GN.DEF) – Personal Pronouns •• (PRO.PERx) – Relative Pronouns (PRO.REL) •
• Pattern specific of Bossuet’s Discourse – Lots of Proper Nouns (GN.NAM) • – NP with possessives (GN.POS) •
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Progressions = view of chains (schemata) throughout the corpus across chapters (textual units)
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Summary
• URS annotation is now possible in TXM => complex annotation tasks such as semantic, reference tagging • URS annotation can also be queried and checked via usual TXM tools – direct feedback on what we are currently doing – quality checking, consistancy
• Undergoing work – develop groovy scripts for checking errors and inconsistancies – embed algorithms for intercoder reliability ◦ at unit level (segmentation) ◦ at schema level (referent identification) 15
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