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Reservoir Computing Universality With Stochastic Inputs
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DOI：10.1109/TNNLS.2019.2899649.png)
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摘要
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The universal approximation properties with respect to L-p-type criteria of three important families of reservoir computers with stochastic discrete-time semi-infinite inputs are shown. First, it is proven that linear reservoir systems with either polynomial or neural network readout maps are universal. More importantly, it is proven that the same property holds for two families with linear readouts, namely, trigonometric state-affine systems and echo state networks, which are the most widely used reservoir systems in applications. The linearity in the readouts is a key feature in supervised machine learning applications. It guarantees that these systems can be used in high-dimensional situations and in the presence of large data sets. The L-p criteria used in this paper allow the formulation of universality results that do not necessarily impose almost sure uniform boundedness in the inputs or the fading memory property in the filter that needs to be approximated.
Keyword:
Echo state network (ESN)
machine learning
reservoir computing
stochastic input
uniform system approximation
universality
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