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DAISY Dutch lAnguage Investigation of Summarization technologY Katholieke Universiteit Leuven Rijksuniversiteit Groningen Q-go.

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Presentation on theme: "DAISY Dutch lAnguage Investigation of Summarization technologY Katholieke Universiteit Leuven Rijksuniversiteit Groningen Q-go."— Presentation transcript:

1 DAISY Dutch lAnguage Investigation of Summarization technologY Katholieke Universiteit Leuven Rijksuniversiteit Groningen Q-go

2 DAISY on one slide Segmentation Rhetorical classification Sentence compression Sentence generation Segmentation Rhetorical classification Sentence compression Sentence generation Multi-document summarization: Detect differences Improvement question answering, e.g. answering Summarization of web content

3 Overview Report of our current progress in: Corpus building and preprocessing Segmentation Sentence generation

4 Corpus Building and Preprocessing Target: corpus of questions, short texts and webpages about the same topic Freely available: – UWV (questions & answer texts) – SVB (questions) Available for internal use: KLM (questions, answer texts, web pages) Todo: – web pages SVB – ABN AMRO (committed, not delivered)

5 Corpus Building and Preprocessing POS-tagged and parsed: KLM and UWV SVB corpus: in progress Coreference resolution: in progress

6 Segmentation Find main content in webpage Smaller segments Can be obtained from HTML structure,,,,... Hierarchical Will be refined in relation to rhetorical roles

7 Segmentation

8

9  Search for block with highest density of text

10 Segmentation

11 Additional heuristics to extend the selection: Find closing tags for all tags that were opened in the selection Include all text delimited by known tag patterns occurring just before and after the selection Take the smallest enclosing DIV block

12 Sentence generation Specification of abstract dependency trees – Specify grammatical relations between lexical items and constituents dominating over lexical items – Alpino dependency trees without adjacency information – More variation through underspecification in lexical items, handling of particles

13 Sentence generation Initial implementation generator: – Chart generator (Kay, 1996) – Top-down guidance through expected dependency relations – Generates substantial part of input created from the Alpino testsuites – Included in recent Alpino versions Further work: optimization (time and space)

14 Sentence generation Selecting the most fluent sentence through fluency ranking: – N-gram language model – Log-linear model – Experiments with Velldall (2007) and parse disambiguation feature templates. Need more insight about feature overlap Experiment with more feature templates

15 Sentence generation Evaluation: – Corpus sentences used as a reference for the most fluent realization – Fairly strict, since there can be multiple fluent sentences – Where is the ceiling? – More annotated material! – FLAN: FLuency ANnotator (web application)

16 Thanks!


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