1 Part-of-Speech (POS) Tagging Revisited Mark Sharp CS-536 Machine Learning Term Project Fall 2003.

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Presentation transcript:

1 Part-of-Speech (POS) Tagging Revisited Mark Sharp CS-536 Machine Learning Term Project Fall 2003

2 The False Drop Problem blind venetian vs venetian blind dog bites man vs man bites dog

3 POS Tagging blind/adj venetian/propernoun vs venetian/adj blind/noun dog/noun bites/verb man/noun vs man/noun bites/verb dog/noun

4 Syntactic Parsing blind/adj venetian/propernoun vs venetian/adj blind/noun dog/noun/subj bites/verb/pred man/noun/DO vs man/noun/subj bites/verb/pred dog/noun/DO

5 Semantic Tagging blind/adj venetian/propernoun vs venetian/adj blind/noun dog/noun/subj bites/verb/pred man/noun/DO vs man/noun/subj bites/verb/pred dog/noun/DO

6 Wanted: automatic POS tagger ~95% of words are unambiguous Many hand-tagged corpora for training Rule-based: tag n  feature 1, feature 2,… Stochastic: P(tag n |tag n-1, tag n-2,…) Brill: search “rule space” for most effective “transformations” of dominant/majority tags and paint them onto tagged text dynamically.

7 Problem: rule space is infinite ………………………………………………… ……………………………………………… ……………………………………………… ……………………………………………… ………………………?……………………… ……………………………………………… ……………………………………………… ……………………………………………… ………………………………………………

8 Brill’s solution: narrow window + rule templates …?…

9 Shotgun Approach Weka J48 (C4.5 pruned decision tree) Susanne corpus: 571 unique token/words with >1 POS tag out of tokens. Attributes: 1. token n 2. tag n (class to predict) tag n-10, tag n-9,… tag n+9, tag n token n-10, token n-9,… token n+10 Result: 4.1%  2.2% error rate (curve C)

10 TBL Approach (true) For each of 571 unique token/words with >1 POS tag, compute and apply transformation rule in order of error impact. Attributes: 1. token n 2. tag n (class to predict) tag n-10, tag n-9,… tag n+9, tag n token n-10, token n-9,… token n+10 Big Java project!

11.………?………. Shotgun Approach

12.………?………. ………..………. TBL Approach (true)

13 TBL Approach (simulated) Do a shotgun 22-attribute J48 for 544 low- impact tokens (curve A). For each of 17 high-impact tokens, do a single-token 42-attribute J48 and apply transformation rule in order of error impact (curve B). Result: 4.1%  2.1% error rate For single tokens, J48 rules look a lot like Brill’s templates !!!

14 TBL Approach (simulated)

15 A J48 transformation rule if (token[n] EQUALS "to") then set tag[n] to "TO" if (tag[n+1] MEMBER_OF {CD COL DOL DT JJ JJR NN NNP NNS PDT PP PPS RB VBG VBN WDT WRB} [6 new cases] then change tag[n] to "IN" if (tag[n+1] EQUALS "RB") if (tag[n+2] EQUALS "VB") [3 new cases] then change tag[n] back to "TO"

16 Details, paper, data, scripts, etc.