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We study the following computational problem: for which values of k, the majority of n bits MAJn can be computed with a depth two formula whose each gate computes a majority function of at most k bits? The corresponding computational model is denoted by MAJk o MAJk. We observe that the minimum value of k for which there exists a MAJk o MAJk circuit that has high correlation with the majority of n bits is equal to Θ(n1/2). We then show that for a randomized MAJk o MAJk circuit computing the majority of n input bits with high probability for every input, the minimum value of k is equal to n2/3+o(1). We show a worst case lower bound: if a MAJk o MAJk circuit computes the majority of n bits correctly on all inputs, then k ≥ n13/19+o(1). This lower bound exceeds the optimal value for randomized circuits and thus is unreachable for pure randomized techniques. For depth 3 circuits we show that a circuit with k = O(n2/3) can compute MAJn correctly on all inputs.
Язык оригинала | английский |
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Название основной публикации | 34th Symposium on Theoretical Aspects of Computer Science, STACS 2017 |
Редакторы | Brigitte Vallee, Heribert Vollmer |
Издатель | Schloss Dagstuhl- Leibniz-Zentrum fur Informatik GmbH, Dagstuhl Publishing |
ISBN (электронное издание) | 9783959770286 |
DOI | |
Состояние | Опубликовано - 1 мар 2017 |
Событие | 34th Symposium on Theoretical Aspects of Computer Science, STACS 2017 - Hannover, Германия Продолжительность: 8 мар 2017 → 11 мар 2017 |
Название | Leibniz International Proceedings in Informatics, LIPIcs |
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Том | 66 |
ISSN (печатное издание) | 1868-8969 |
конференция | 34th Symposium on Theoretical Aspects of Computer Science, STACS 2017 |
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Страна/Tерритория | Германия |
Город | Hannover |
Период | 8/03/17 → 11/03/17 |
ID: 49820870