“…Many of the first successful approaches were based on polynomial chaos expansion (for an overview of this family of algorithms see [3]). These were followed by other machine learning inspired solutions falling mainly into the category of kernel machine regression (e.g., [4], [5], [6], [7], [8], [9]) and artificial neural networks (ANNs) (e.g., [10], [11], [12], [13], [14]). This article focuses on kernel machine regression techniques, such as: the support vector machine (SVM) regression [15], the least-squares support vector machine (LS-SVM) [16] regression, and the more recent vector-valued kernel ridge regression (KRR) [6], [7], [17], which have been proven particularly effective for various microelectronics and radio-frequency applications [4], [5], [8].…”