An Information-Theoretic Analysis of Threshold Group Testing
Remco van der Hofstad, Noela M\"uller, Connor Riddlesden
https://arxiv.org/abs/2606.11353 https://arxiv.org/pdf/2606.11353 https://arxiv.org/html/2606.11353
arXiv:2606.11353v1 Announce Type: new
Abstract: We study the Threshold Group Testing (TGT) problem in the noiseless and non-adaptive setting, where the objective is to exactly recover a sparse binary vector from pooled tests, using as few tests as possible. In TGT, each test applied to a subset of items returns a positive outcome if the number of 1's (defective items) in that subset meets or exceeds a specified threshold, and has a negative outcome otherwise. We investigate how the complexity of TGT compares to that of Classical Group Testing (CGT), corresponding to the special case of the threshold equal to one, and analyse the impact of increasing the threshold on the required number of tests.
Our main contribution is the derivation of a sharp information-theoretic phase transition at $c_{\mathrm{inf}}^{\mathrm{TGT}}k\log(n/k)$ (non-adaptive) tests for TGT within the constant-column test design. The threshold constant $c_{\mathrm{inf}}^{\mathrm{TGT}}$ is expressed as a function of the prevalence of defectives and the threshold value. Our upper bound is derived under an analytic assumption, and we verify that this assumption is satisfied for a threshold value of 2.
The value of $c_{\mathrm{inf}}^{\mathrm{TGT}}$ reveals that TGT on the constant-column design has the same information-theoretic behaviour as CGT in the low-prevalence regime. Yet, strikingly, at higher prevalences, the threshold leads to a significant reduction in the number of tests.
On the other hand, we provide evidence that when the asymptotic proportion of defective items is positive, TGT actually becomes strictly harder than CGT (excluding trivial reductions).
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@… 20 km, hin und zurück. In der Südstadt, am Rand der Innenstadt, in Linden. Autos mit Aufsteckfläggchen: 2. Eins eine Uber-Taxe. Eins hatte zwei Fläggchen: Türkei und BRD. Ausgehängte große Euphorietücher: 2. Das schwule Paar in der Südstadt, das zur WM immer Schland neben den Regenbogen hängen hatte, hatte nur Regenbogen.
Stille, nachdem das Spiel vorbei w…
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Macht statt Menschenrechte
In wenigen Tagen beginnt die #FIFAWM der Männer: Korruption, Intrigen, Machtpolitik vorbei an Recht und Ordnung.
#Deutschlandfunk #BehindTheGames
Just had a small argument with an AI (an LLM) over the Early Modern English (Shakespeare's English) use of singular verb conjugation with the singular: "they."
ex: "There’s not a man I meet but doth salute me" - The Comedy of Errors, Act 4, scene 3
I won the argument, both because I was right, and because the AI doesn't understand anything. 😜
Good times getting into my
OpenAI adds support for Google's SynthID watermarks in AI images, and previews a public portal to let users verify if an image was generated by OpenAI's tools (Jess Weatherbed/The Verge)
https://www.theverge.com/ai-artificial-int
Die Bundesregierung möchte, daß Klagen von Umweltverbänden keine aufschiebende Wirkung mehr haben. Nun gut, wenn das Gericht dann im Nachhinein feststellt, daß das Wegbaggern des Bannwaldes eine dumme Idee und rechtswidrig war, ist dieser Wald trotzdem weg.
Um dafür einen Ausgleich herzustellen, müßte der Staat also gezwungen werden, kurzfristig einen gleichwertigen Ersatz zu schaffen. Und damit die Entscheidungsträgys sich auch der Tragweise ihrer Beschlüsse bewußt sind, sollten sie…
RE: https://digitalcourage.social/@BlumeEvolution/116475223890832485
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