Neural Networks for Conditional Probability Estimation

Husmeier Dirk

ISBN 10: 1852330953 / ISBN 13: 9781852330958

Published by Springer, 1999

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PRINT ON DEMAND pp. 302.

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Bibliographic Details

• Title: Neural Networks for Conditional Probability Estimation
• Publisher: Springer
• Publication Date: 1999
• Language: English
• ISBN 10: 1852330953
• ISBN 13: 9781852330958
• Binding: Soft cover
• Condition: New

About this title

Synopsis

Conventional applications of neural networks usually predict a single value as a function of given inputs. In forecasting, for example, a standard objective is to predict the future value of some entity of interest on the basis of a time series of past measurements or observations. Typical training schemes aim to minimise the sum of squared deviations between predicted and actual values (the 'targets'), by which, ideally, the network learns the conditional mean of the target given the input. If the underlying conditional distribution is Gaus­ sian or at least unimodal, this may be a satisfactory approach. However, for a multimodal distribution, the conditional mean does not capture the relevant features of the system, and the prediction performance will, in general, be very poor. This calls for a more powerful and sophisticated model, which can learn the whole conditional probability distribution. Chapter 1 demonstrates that even for a deterministic system and 'be­ nign' Gaussian observational noise, the conditional distribution of a future observation, conditional on a set of past observations, can become strongly skewed and multimodal. In Chapter 2, a general neural network structure for modelling conditional probability densities is derived, and it is shown that a universal approximator for this extended task requires at least two hidden layers. A training scheme is developed from a maximum likelihood approach in Chapter 3, and the performance ofthis method is demonstrated on three stochastic time series in chapters 4 and 5.