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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 on theme: "Learning Multilingual Subjective Language via Cross-Lingual Projections Mihalcea, Banea, and Wiebe ACL 2007 NLG Lab Seminar 4/11/2008."— Presentation transcript:

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

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

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

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

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

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

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

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

9 Sample Translation

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

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

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

13 Romanian Classifier Performance

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

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

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

17 OpinionFinder Sentence Subjectivity Classifier Performance

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

19 Romanian Sentence Subjectivity Classifier Algorithm Naïve Bayes Word features

20 Romanian Classifier Performance

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

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

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