A unified SWSI-KAMs framework and performance evaluation on face recognition

Kernel method is an effective and popular trick in machine learning. In this paper, by introducing it into conventional auto-associative memory models (AMs), we construct a unified framework of kernel auto-associative memory models (KAMs),which makes the existing exponential and polynomial AMs become its special cases. Further, in order to reduce KAM’s connect complexity, inspired by “small-world network” recently described by Watts and Strogatz, we propose another unified framework of small-world structure (SWS) inspired kernel auto-associative memory models (SWSI-KAMs), which, in principle, makes KAMs implemented easier in structure. Simulation results on FERET face database show that, the SWSI-KAMs adopting such kernels as Exponential and Hyperbolic tangent kernels have advantages of configuration simplicity while their recognition performance is almost as well as, even better than, corresponding KAMs with full connectivity. In the end, the SWSI-KAM adopting Exponential kernel with different connectivities was emphatically investigated for robustness based on those face images which are added random noises and/or partially occluded in a mosaic way, and the experiments demonstrate that the SWSI-KAM with Exponential kernel is more robust in all cases of network connectivity of 20%, 40% and 60% than * Corresponding author: Tel: +86-25-84892805; Fax: +86-25-84498069; Email: [email protected] (S.C. Chen); [email protected].