Boxlets: A Fast Convolution Algorithm for Signal Processing and Neural Networks

Part of Advances in Neural Information Processing Systems 11 (NIPS 1998)

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Patrice Simard, Léon Bottou, Patrick Haffner, Yann LeCun


Signal processing and pattern recognition algorithms make exten(cid:173) sive use of convolution. In many cases, computational accuracy is not as important as computational speed. In feature extraction, for instance, the features of interest in a signal are usually quite distorted. This form of noise justifies some level of quantization in order to achieve faster feature extraction . Our approach consists of approximating regions of the signal with low degree polynomi(cid:173) als, and then differentiating the resulting signals in order to obtain impulse functions (or derivatives of impulse functions). With this representation, convolution becomes extremely simple and can be implemented quite effectively. The true convolution can be recov(cid:173) ered by integrating the result of the convolution. This method yields substantial speed up in feature extraction and is applicable to convolutional neural networks.