On the construction of the relevance vector machine based on Bayesian Ying-Yang harmony learning.
Tipping's relevance vector machine (RVM) applies kernel methods to construct basis function networks using a least number of relevant basis functions. Compared to the well-known support vector machine (SVM), the RVM provides a better sparsity, and an automatic estimation of hyperparameters. However, the performance of the original RVM purely depends on the smoothness of the presumed prior of the connection weights and parameters. Consequently, the sparsity is actually still controlled by the choice of kernel functions and/or kernel parameters. This may lead to severe underfitting or overfitting in some cases. In this research, we explicitly involve the number of basis functions into the objective of the optimization procedure, and construct the RVM by maximizing the harmony function between "hypothetical" probability distribution in the forward training pathway and "true" probability distribution in the backward testing pathway, using Xu's Bayesian Ying-Yang (BYY) harmony learning technique. The experimental results have shown that our proposed methodology can achieve both the least complexity of structure and goodness of fit to data.
School of Computer Science and Technology, Harbin Institute of Technology, Harbin 150001, People's Republic of China. Electronic address: cdsinhit@hit.edu.cn.
Dansong
D
Cheng
Minh Nhut
MN
Nguyen
Junbin
J
Gao
Daming
D
Shi
D000465:Algorithms; D001185:Artificial Intelligence; D001499:Bayes Theorem; D016013:Likelihood Functions; D016011:Normal Distribution; D060388:Support Vector Machine
Bayesian Ying-Yang (BYY) harmony learning; Bayesian inference; Relevance vector machine (RVM)