Optical EngineeringMultimodal pattern recognition by modular neural network
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Multilayer perceptrons (MLPs) have been widely applied to pattern recognition. It is found that when the data has a multimodal distribution, a standard MLP is hard to train and a valid neural network classifier is difficult to obtain. We propose a two-phase learning modular (TLM) neural network architecture to tackle this problem. The basic idea is to transform the multimodal distribution into a known and more learn- able distribution and then use a standard MLP to classify the new data. The transformation is accomplished by decomposing the input feature space into several subspaces and training several MLPs with samples in the subsets. We verified this idea with a two-class classification example and applied the TLM to the inverse synthetic aperture radar (ISAR) automatic target recognition (ATR), and compared its performance with that of the MLP. Experiments show that the MLP is difficult to train. Its performance depends strongly on the number of training samples as well as the architecture parameters. On the other hand, the TLM is much easier to train and yields better performance. In addition, the TLM's performance is more robust.