Neural Computing and Applications, ( ISI ), Volume (23), No (3), Year (2012-2) , Pages (1283-1295)

Title : ( Online cost-sensitive neural network classifiers for non-stationary and imbalanced data streams )

Authors: Adel Ghazikhani , Reza Monsefi , Hadi Sadoghi Yazdi ,

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Abstract

Classifying non-stationary and imbalanced data streams encompasses two important challenges, namely concept drift and class imbalance. Concept drift is changes in the underlying function being learnt, and class imbalance is vast difference between the numbers of instances in different classes of data. Class imbalance is an obstacle for the efficiency of most classifiers. Previous methods for classifying non-stationary and imbalanced data streams mainly focus on batch solutions, in which the classification model is trained using a chunk of data. Here, we propose two online classifiers. The classifiers are one-layer NNs. In the proposed classifiers, class imbalance is handled with two separate cost-sensitive strategies. The first one incorporates a fixed and the second one an adaptive misclassification cost matrix. The proposed classifiers are evaluated on 3 synthetic and 8 real-world datasets. The results show statistically significant improvements in imbalanced data metrics.

Keywords

, Data stream classification, One-layer neural network , Concept drift , Imbalanced data , online classification Cost-sensitive learning
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@article{paperid:1028938,
author = {Ghazikhani, Adel and Monsefi, Reza and Sadoghi Yazdi, Hadi},
title = {Online cost-sensitive neural network classifiers for non-stationary and imbalanced data streams},
journal = {Neural Computing and Applications},
year = {2012},
volume = {23},
number = {3},
month = {February},
issn = {0941-0643},
pages = {1283--1295},
numpages = {12},
keywords = {Data stream classification; One-layer neural network ; Concept drift ; Imbalanced data ; online classification Cost-sensitive learning},
}

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%0 Journal Article
%T Online cost-sensitive neural network classifiers for non-stationary and imbalanced data streams
%A Ghazikhani, Adel
%A Monsefi, Reza
%A Sadoghi Yazdi, Hadi
%J Neural Computing and Applications
%@ 0941-0643
%D 2012

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