PASCAL - Pattern Analysis, Statistical Modelling and Computational Learning

Machine learning for intrusion detection: Modeling the distribution shift
Bassam Farran, Craig Saunders and Mahesan Niranjan
In: Machine Learning for Signal Processing (MLSP), 2010 IEEE International Workshop on(2010).


This paper addresses two important issue that arise in formulating and solving computer intrusion detection as a machine learning problem, a topic that has attracted considerable attention in recent years including a community-wide competition using a common data set known as the KDD Cup '991. The first of these problems we address is the size of the data set, 5×106 by 41 features, which makes conventional learning algorithms impractical. In previous work, we introduced a one-pass non-parametric classification technique called Voted Spheres, which carves up the input space into a series of overlapping hyperspheres. Training data seen within each hypersphere is used in a voting scheme during testing on unseen data. Secondly, we address the problem of distribution shift whereby the training and test data may be drawn from slightly different probability densities, while the conditional densities of class membership for a given datum remains the same. We adopt two recent techniques from the literature, density weighting and kernel mean matching, to enhance the Voted Spheres technique to deal with such distribution disparities. We demonstrate that substantial performance gains can be achieved using these techniques on the KDD cup data set.

EPrint Type:Conference or Workshop Item (Paper)
Project Keyword:Project Keyword UNSPECIFIED
Subjects:Learning/Statistics & Optimisation
Theory & Algorithms
ID Code:7604
Deposited By:Craig Saunders
Deposited On:17 March 2011