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Dimension reduction in recurrent networks by canonicalization

  • *Corresponding author: Juan-Pablo Ortega

    *Corresponding author: Juan-Pablo Ortega

JPO acknowledges partial financial support coming from the Research Commission of the Universität Sankt Gallen and the Swiss National Science Foundation (grant number 200021 175801/1)

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  • Many recurrent neural network machine learning paradigms can be formulated using state-space representations. The classical notion of canonical state-space realization is adapted in this paper to accommodate semi-infinite inputs so that it can be used as a dimension reduction tool in the recurrent networks setup. The so-called input forgetting property is identified as the key hypothesis that guarantees the existence and uniqueness (up to system isomorphisms) of canonical realizations for causal and time-invariant input/output systems with semi-infinite inputs. Additionally, the notion of optimal reduction coming from the theory of symmetric Hamiltonian systems is implemented in our setup to construct canonical realizations out of input forgetting but not necessarily canonical ones. These two procedures are studied in detail in the framework of linear fading memory input/output systems. {Finally, the notion of implicit reduction using reproducing kernel Hilbert spaces (RKHS) is introduced which allows, for systems with linear readouts, to achieve dimension reduction without the need to actually compute the reduced spaces introduced in the first part of the paper.

    Mathematics Subject Classification: Primary: 68T05, 68T07; Secondary: 93-08, 93Bxx.


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