Conference paper
Vocabulary Pruning for Improved Context Recognition
Language independent `bag-of-words' representations are surprisingly effective for text classification. The representation is high dimensional though, containing many non-consistent words for text categorization. These non-consistent words result in reduced generalization performance of subsequent classifiers, e.g., from ill-posed principal component transformations.
In this communication our aim is to study the effect of reducing the least relevant words from the bag-of-words representation. We consider a new approach, using neural network based sensitivity maps and information gain for determination of term relevancy, when pruning the vocabularies. With reduced vocabularies documents are classified using a latent semantic indexing representation and a probabilistic neural network classifier.
Reducing the bag-of-words vocabularies with 90%-98%, we find consistent classification improvement using two mid size data-sets. We also study the applicability of information gain and sensitivity maps for automated keyword generation.
Language: | English |
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Publisher: | IEEE Press |
Year: | 2004 |
Pages: | 80-85 |
Journal subtitle: | Special Session on Machine Learning for Text Mining |
Types: | Conference paper |
ORCIDs: | Hansen, Lars Kai and Larsen, Jan |