Abstract
In this paper, extreme learning machine (ELM) for ε-insensitive error loss function-based regression problem formulated in 2-norm as an unconstrained optimization problem in primal variables is proposed. Since the objective function of this unconstrained optimization problem is not twice differentiable, the popular generalized Hessian matrix and smoothing approaches are considered which lead to optimization problems whose solutions are determined using fast Newton–Armijo algorithm. The main advantage of the algorithm is that at each iteration, a system of linear equations is solved. By performing numerical experiments on a number of interesting synthetic and real-world datasets, the results of the proposed method are compared with that of ELM using additive and radial basis function hidden nodes and of support vector regression (SVR) using Gaussian kernel. Similar or better generalization performance of the proposed method on the test data in comparable computational time over ELM and SVR clearly illustrates its efficiency and applicability.
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Acknowledgments
The authors would like to thank the referees for their valuable comments that greatly improved the earlier version of the paper. Mr. Kapil acknowledges the financial support given as scholarship by Council of Scientific and Industrial Research, India.
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Balasundaram, S., Kapil On extreme learning machine for ε-insensitive regression in the primal by Newton method. Neural Comput & Applic 22, 559–567 (2013). https://doi.org/10.1007/s00521-011-0798-9
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DOI: https://doi.org/10.1007/s00521-011-0798-9