Democratic Liquid State Machines for Music Recognition

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The liquid state machine (LSM) is a relatively new recurrent neural network (RNN) architecture for dealing with time-series classification problems. The LSMhas some attractive properties such as a fast training speed compared with more traditional RNNs, its biological plausibility, and its ability to deal with highly nonlinear dynamics. This paper presents the democratic LSM, an extension of the basic LSM that uses majority voting by combining two dimensions. First, instead of only giving the classification at the end of the time-series, multiple classifications after different time-periods are combined. Second, instead of using a single LSM, multiple ensembles are combined. The results show that the democratic LSM significantly outperforms the basic LSM and other methods on two music composer classification tasks where the goal is to separate Haydn/Mozart and Beethoven/Bach, and a music instrument classification problem where the goal is to distinguish between a flute and a bass guitar.