Phase retrieval in high dimensions: Statistical and computational phase transitions

A Maillard, B Loureiro, F Krzakala… - Advances in Neural …, 2020 - proceedings.neurips.cc
Advances in Neural Information Processing Systems, 2020proceedings.neurips.cc
We consider the phase retrieval problem of reconstructing a $ n $-dimensional real or
complex signal $\mathbf {X}^\star $ from $ m $(possibly noisy) observations $ Y_\mu=|\sum_
{i= 1}^ n\Phi_ {\mu i} X^{\star} _i/\sqrt {n}| $, for a large class of correlated real and complex
random sensing matrices $\mathbf {\Phi} $, in a high-dimensional setting where $ m,
n\to\infty $ while $\alpha= m/n=\Theta (1) $. First, we derive sharp asymptotics for the lowest
possible estimation error achievable statistically and we unveil the existence of sharp phase …
Abstract
We consider the phase retrieval problem of reconstructing a -dimensional real or complex signal from (possibly noisy) observations , for a large class of correlated real and complex random sensing matrices , in a high-dimensional setting where while . First, we derive sharp asymptotics for the lowest possible estimation error achievable statistically and we unveil the existence of sharp phase transitions for the weak-and full-recovery thresholds as a function of the singular values of the matrix . This is achieved by providing a rigorous proof of a result first obtained by the replica method from statistical mechanics. In particular, the information-theoretic transition to perfect recovery for full-rank matrices appears at (real case) and (complex case). Secondly, we analyze the performance of the best-known polynomial time algorithm for this problem---approximate message-passing---establishing the existence of statistical-to-algorithmic gap depending, again, on the spectral properties of . Our work provides an extensive classification of the statistical and algorithmic thresholds in high-dimensional phase retrieval for a broad class of random matrices.
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