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Evolving a dynamic predictive coding mechanism for novelty detection

Haggett, Simon J. and Chu, Dominique F. and Marshall, Ian W. (2008) Evolving a dynamic predictive coding mechanism for novelty detection. International Journal of Knowledge-Based and Intelligent Engineering Systems, 21 (3). pp. 217-224.

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Abstract

Novelty detection is a machine learning technique which identifies new or unknown information in data sets. We present our current work on the construction of a new novelty detector based on a dynamical version of predictive coding. We compare three evolutionary algorithms, a simple genetic algorithm, NEAT and FS-NEAT, for the task of optimising the structure of an illustrative dynamic predictive coding neural network to improve its performance over stimuli from a number of artificially generated visual environments. We find that NEAT performs more reliably than the other two algorithms in this task and evolves the network with the highest fitness. However, both NEAT and FS-NEAT fail to evolve a network with a significantly higher fitness than the best network evolved by the simple genetic algorithm. The best network evolved demonstrates a more consistent performance over a broader range of inputs than the original network. We also examine the robustness of this network to noise and find that it handles low levels reasonably well, but is outperformed by the illustrative network when the level of noise is increased.

Item Type: Article
Journal or Publication Title: International Journal of Knowledge-Based and Intelligent Engineering Systems
Additional Information: The final, definitive version of this article has been published in the International Journal of Knowledge-Based and Intelligent Engineering Systems 21 (3) 2008, © ELSEVIER.
Uncontrolled Keywords: Novelty detection ; Neural networks ; Neuroevolution ; Evolutionary algorithms
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Departments: UNSPECIFIED
ID Code: 27223
Deposited By: Mrs Yaling Zhang
Deposited On: 08 Oct 2009 12:42
Refereed?: Yes
Published?: Published
Last Modified: 23 Jul 2014 14:49
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/27223

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