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The impact of VMAX activation function in particle swarm optimization neural network

Lee, Yiew Siang (2008) The impact of VMAX activation function in particle swarm optimization neural network. Masters thesis, Universiti Teknologi Malaysia, Faculty of Computer Science and Information Systems.

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Abstract

Back propagation (BP) Network is the most common technique in Artificial Neural Network (ANN) learning. However, major disadvantages of BP are its convergence rate is relatively slow and always being trapped at the local minima. Therefore, latest optimization technique, Particle Swarm Optimization (PSO) is chosen and applied in feed forward neural network to enhance the network learning. In conventional PSO, maximum velocity, Vmax serves as a constraint that controls the maximum global exploration ability PSO can have. By setting a too small maximum velocity, maximum global exploration ability is limited and PSO will always favor a local search no matter what the inertia weight is. By setting a large maximum velocity, PSO can have a large range of exploration ability. Therefore, in this study, different activation functions will apply in the PSO Vmax function in order to control global exploration of particles and increase the convergence rate as well as correct classification. The preliminary results show that Vmax hyperbolic tangent function give promising results in term of convergence rate and classification compared to Vmax sigmoid function and standard Vmax function.

Item Type:Thesis (Masters)
Additional Information:Supervisor : Assoc. Prof. Dr. Siti Mariyam binti Hj Shamsuddin
Uncontrolled Keywords:back propagation (BP) network, artificial neural network (ANN)
Subjects:Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Divisions:Computer Science and Information System (Formerly known)
ID Code:9456
Deposited By: Ms Zalinda Shuratman
Deposited On:24 Nov 2009 01:49
Last Modified:05 Sep 2012 02:50

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