Learning Multilingual Subjective Language via Cross-Lingual Projections Mihalcea, Banea, and Wiebe ACL 2007 NLG Lab Seminar 4/11/2008.

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Presentation transcript:

Learning Multilingual Subjective Language via Cross-Lingual Projections Mihalcea, Banea, and Wiebe ACL 2007 NLG Lab Seminar 4/11/2008

Objective Build Romanian sentence subjectivity classifier from English resources No language-specific information

First Approach English Lexicon Romanian Lexicon Romanian Sentence Subjectivity Classifier Translate Train

First Approach English Lexicon Romanian Lexicon Romanian Sentence Subjectivity Classifier Translate Train

English Lexicon From OpinionFinder (Wiebe) Manual annotation 6856 entries (990 multi-word entries) Strong v.s. Weak

First Approach English Lexicon Romanian Lexicon Romanian Sentence Subjectivity Classifier Translate Train

Translation and Challenges Dictionary-based Lemma Word-sense disambiguation Multi-word translation

First Approach English Lexicon Romanian Lexicon Romanian Sentence Subjectivity Classifier Translate Train

Sample Translation

Translation Quality 2 Romanian annotators Accuracy: 94/150 (63%)

First Approach English Lexicon Romanian Lexicon Romanian Sentence Subjectivity Classifier Translate Train

Romanian Sentence Subjectivity Classifier Algorithm If  strong expression  subjective Else if  2 weak expressions  objective Else unknown

Romanian Classifier Performance

Problem with First Approach English Lexicon Romanian Lexicon Romanian Sentence Subjectivity Classifier Translate Train

Second Approach Opinion Finder Classifier Parallel Corpus: English Train Tag Parallel Corpus: Romanian ProjectTrain Romanian Classifier Annotated English Sentence Subjectivity Corpus

Second Approach Annotated English Sentence Subjectivity Corpus Opinion Finder Classifier Parallel Corpus: English Train Tag Parallel Corpus: Romanian ProjectTrain Romanian Classifier

OpinionFinder Sentence Subjectivity Classifier Performance

Second Approach Opinion Finder Classifier Parallel Corpus: English Train Tag Parallel Corpus: Romanian ProjectTrain Romanian Classifier Annotated English Sentence Subjectivity Corpus

Romanian Sentence Subjectivity Classifier Algorithm Naïve Bayes Word features

Romanian Classifier Performance

First Approach Language 1 Corpus Language 2 Corpus Language 2 Classifier Translate Train

Second Approach Annotated Language 1 Corpus Language 1 Classifier Parallel Corpus: Language 1 Train Tag Parallel Corpus: Language 2 ProjectTrain Language 2 Classifier