Projects per year
Abstract
Symbolic machine-learning classifiers are known to suffer from near-sightedness when performing sequence segmentation (chunking) tasks in natural language processing: without special architectural additions they are oblivious of the decisions they made earlier when making new ones. We introduce a new pointwise-prediction single-classifier method that predicts trigrams of class labels on the basis of windowed input sequences, and uses a simple voting mechanism to decide on the labels in the final output sequence. We apply the method to maximum-entropy, sparse winnow, and memory-based classifiers using three different sentence-level chunking tasks, and show that the method is able to boost generalization performance in most experiments, attaining error reductions of up to 51%. We compare and combine the method with two known alternative methods to combat near-sightedness, viz. a feedback-loop method and a stacking method, using the memory-based classifier. The combination with a feedback loop suffers from the label bias problem, while the combination with a stacking method produces the best overall results.
Original language | English |
---|---|
Title of host publication | Proceedings of the Ninth Conference on Natural Language Learning, CONLL-2005, June 29-30 |
Editors | I. Dagan, D. Gildea |
Place of Publication | Ann Arbor, MI |
Publisher | ACL |
Pages | 80-87 |
Number of pages | 8 |
Publication status | Published - 2005 |
Fingerprint
Dive into the research topics of 'Improving sequence segmentation learning by predicting trigrams'. Together they form a unique fingerprint.Projects
- 2 Finished
-
Optimization in machine learning of language
Daelemans, W. M. P. (Researcher)
1/01/04 → 1/01/06
Project: Research project
-