Finite-sample bounds for multi-output system identification
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This paper presents uniform-in-time error bounds for regularized linear regression with vector-valued outputs and conditionally zero-mean subgaussian noise. By revisitileveraging self-normalized martingale arguments, we obtain bounds that apply directly to multi-output regression. These bounds are tighter and hold in more general settings than commonly used methods in finite-sample system identification. Furthermore, because of a novel treatment of the regularization bias, they are tighter even in the scalar-output case. The mild assumptions we use allow for unknown dependencies between regressors and past noise terms, typically induced by system dynamics or feedback mechanisms. Therefore, these novel bounds can be applied to many affine-in-parameter system identification problems, including the identification of a linear time-invariant system from full-state measurements. These results enable less conservative uncertainty quantification in learning-based control, which may significantly improve performance in safety-critical applications.