2 problems

Let a multiple-index model have a central space, and let the generalized signal-to-noise ratio be denoted by $\operatorname{gSNR}$. Lin et al.'s conjecture. The minimax optimal rat…

Let $d$ be bounded, let $0<\lambda\leq 1$, and let $\mathcal{F}_{d}(\lambda,\kappa)$ be the function class of $d$-index models. A function $f_{\lambda}$ is $d$-variate when it is d…