Minimax risk prediction of phase transitions in convex programs

From papers

Let \vctx0Rd\vct{x}_0\in\mathbb{R}^d be the target vector, let Rmm(\vctx0)R_{\mathrm{mm}}(\vct{x}_0) denote the minimax mean-square-error risk, and consider recovery by the convex program with measurement matrix \mtxARm×d\mtx{A}\in\mathbb{R}^{m\times d}. Suppose that \mtxA\mtx{A} has independent standard normal entries and that f:RdRf:\mathbb{R}^d\to\mathbb{R} is convex. Minimax risk predicts phase transitions.

mRmm(\vctx0)+o(d)the recovery program succeeds with probability 1o(1),m \geq R_{\mathrm{mm}}(\vct{x}_0)+o(d)\quad\Longrightarrow\quad\text{the recovery program succeeds with probability }1-o(1), mRmm(\vctx0)+o(d)the recovery program succeeds with probability o(1).m \leq R_{\mathrm{mm}}(\vct{x}_0)+o(d)\quad\Longrightarrow\quad\text{the recovery program succeeds with probability }o(1).

The order notation is intended heuristically. The conjecture asserts that the minimax risk predicts the sharp transition in the number of Gaussian measurements for several convex regularizers, but the statement is presented without a definitive resolution here.

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Primary source

Dennis Amelunxen, Martin Lotz, Michael B. McCoy and Joel A. Tropp, “Living on the edge: Phase transitions in convex programs with random data”, arXiv:1303.6672 (2014).

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