Fully lifted \emph{blirp} interpolation -- a large deviation view

Abstract

[104] introduced a powerful \emph{fully lifted} (fl) statistical interpolating mechanism. It established a nested connection between blirps (bilinearly indexed random processes) and their decoupled (linearly indexed) comparative counterparts. We here revisit the comparison from [104] and introduce its a \emph{large deviation} upgrade. The new machinery allows to substantially widen the [104]'s range of applicability. In addition to \emph{typical}, studying analytically much harder \emph{atypical} random structures features is now possible as well. To give a bit of a practical flavor, we show how the obtained results connect to the so-called \emph{local entropies} (LE) and their predicated role in understanding solutions clustering and associated \emph{computational gaps} in hard random optimization problems. As was the case in [104], even though the technical considerations often appear as fairly involved, the final interpolating forms admit elegant expressions thereby providing a relatively easy to use tool readily available for further studies. Moreover, as the considered models encompass all well known random structures discussed in [104], the obtained results automatically apply to them as well.