An unsupervised PINN is used to learn nonlinear observer gains by enforcing the contraction matrix inequality, with an exponential ISS bound claimed for the resulting observer.
Linearization by output injection and nonlinear observers
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Unsupervised Physics-Informed Neural Network-based Nonlinear Observer design for autonomous systems using contraction analysis
An unsupervised PINN is used to learn nonlinear observer gains by enforcing the contraction matrix inequality, with an exponential ISS bound claimed for the resulting observer.