SFB 732 D5: Biased Learning for Syntactic Disambiguation

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1 SFB 732 D5: Biased Learning for Syntactic Disambiguation Blaubeuren - November 16, 2008

2 Research Areas Biased Learning for Syntactic Disambiguation Learning from monolingual text (grammatical dependencies, n-gram language model) Learning from bilingual text Disambiguating ambiguous German subjects and objects using the English translations in a German/English parallel text A general approach to improve English syntactic parsing using the German translations in German/English parallel text

3 SBAR CC who had gray hair DT NN and DT NN a baby a woman Figure: English parse with high attachment (incorrect)

4 CC DT NN and a baby SBAR DT NN who had gray hair a woman Figure: English parse with low attachment (correct)

5 C KON ART NN und ein Baby ART NN, S eine Frau, die graue Haare hatte Figure: German parse with low attachment

6 Reranking approach using rich bitext projection features Goal: improve English parsing accuracy

7 Reranking approach using rich bitext projection features Goal: improve English parsing accuracy Working on parallel text, e.g., proceedings of European Parliament

8 Reranking approach using rich bitext projection features Goal: improve English parsing accuracy Working on parallel text, e.g., proceedings of European Parliament Begin by parsing English sentence with Bitpar (Schmid). Select 100 most probable parses

9 Reranking approach using rich bitext projection features Goal: improve English parsing accuracy Working on parallel text, e.g., proceedings of European Parliament Begin by parsing English sentence with Bitpar (Schmid). Select 100 most probable parses Find most probable parse of German sentence

10 Reranking approach using rich bitext projection features Goal: improve English parsing accuracy Working on parallel text, e.g., proceedings of European Parliament Begin by parsing English sentence with Bitpar (Schmid). Select 100 most probable parses Find most probable parse of German sentence Using rich bitext projection features, calculate syntactic divergence of each English parse candidate and the (projection of) the German parse

11 Reranking approach using rich bitext projection features Goal: improve English parsing accuracy Working on parallel text, e.g., proceedings of European Parliament Begin by parsing English sentence with Bitpar (Schmid). Select 100 most probable parses Find most probable parse of German sentence Using rich bitext projection features, calculate syntactic divergence of each English parse candidate and the (projection of) the German parse Choose a high probability English parse candidate with low syntactic divergence

12 Rich bitext projection features Mix of probabilistic and heuristic features, combined in log-linear model, trained to maximize parsing accuracy General features: tag correspondence, span size difference, parse depth difference Specific features: coordination phenomena, structure Documented in EACL submission Current project: improve parses of Europarl corpus (1.4 million parallel sentences)

13 D5 contributes to 3 Area D Goals, one long-term SFB goal Types of contextual information: D5 uses contextual information derived from bilingual and monolingual syntactic analyses, at varying levels of granularity (e.g., parse tree vs. n-gram)

14 D5 contributes to 3 Area D Goals, one long-term SFB goal Types of contextual information: D5 uses contextual information derived from bilingual and monolingual syntactic analyses, at varying levels of granularity (e.g., parse tree vs. n-gram) Learnability of contextual information: D5 uses statistical models of context learned from bilingual and monolingual data, often itself a product of syntactic analysis

15 D5 contributes to 3 Area D Goals, one long-term SFB goal Types of contextual information: D5 uses contextual information derived from bilingual and monolingual syntactic analyses, at varying levels of granularity (e.g., parse tree vs. n-gram) Learnability of contextual information: D5 uses statistical models of context learned from bilingual and monolingual data, often itself a product of syntactic analysis Use of contextual information: D5 uses statistical models of context for improving syntactic analysis

16 D5 contributes to 3 Area D Goals, one long-term SFB goal Types of contextual information: D5 uses contextual information derived from bilingual and monolingual syntactic analyses, at varying levels of granularity (e.g., parse tree vs. n-gram) Learnability of contextual information: D5 uses statistical models of context learned from bilingual and monolingual data, often itself a product of syntactic analysis Use of contextual information: D5 uses statistical models of context for improving syntactic analysis Incorporating linguistic insights into statistical models: D5 uses insights into complementarity of English and German ambiguity to improve statistical syntactic disambiguation

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