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Articoli di riviste sul tema "Approximate counting"

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Autore: Grafiati

Pubblicato: 31 agosto 2024

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1

BUSS, SAMUEL R., LESZEK ALEKSANDER KOŁODZIEJCZYK e NEIL THAPEN. "FRAGMENTS OF APPROXIMATE COUNTING". Journal of Symbolic Logic 79, n. 2 (giugno 2014): 496–525. http://dx.doi.org/10.1017/jsl.2013.37.

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AbstractWe study the long-standing open problem of giving $\forall {\rm{\Sigma }}_1^b$ separations for fragments of bounded arithmetic in the relativized setting. Rather than considering the usual fragments defined by the amount of induction they allow, we study Jeřábek’s theories for approximate counting and their subtheories. We show that the $\forall {\rm{\Sigma }}_1^b$ Herbrandized ordering principle is unprovable in a fragment of bounded arithmetic that includes the injective weak pigeonhole principle for polynomial time functions, and also in a fragment that includes the surjective weak pigeonhole principle for FPNP functions. We further give new propositional translations, in terms of random resolution refutations, for the consequences of $T_2^1$ augmented with the surjective weak pigeonhole principle for polynomial time functions.

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2

Aronov, Boris, e Micha Sharir. "Approximate Halfspace Range Counting". SIAM Journal on Computing 39, n. 7 (gennaio 2010): 2704–25. http://dx.doi.org/10.1137/080736600.

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3

Louchard, Guy, e Helmut Prodinger. "Generalized approximate counting revisited". Theoretical Computer Science 391, n. 1-2 (febbraio 2008): 109–25. http://dx.doi.org/10.1016/j.tcs.2007.10.035.

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4

Jeřábek, Emil. "Approximate counting in bounded arithmetic". Journal of Symbolic Logic 72, n. 3 (settembre 2007): 959–93. http://dx.doi.org/10.2178/jsl/1191333850.

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AbstractWe develop approximate counting of sets definable by Boolean circuits in bounded arithmetic using the dual weak pigeonhole principle (dWPHP(PV)), as a generalization of results from [15]. We discuss applications to formalization of randomized complexity classes (such as BPP, APP, MA, AM) in PV1 + dWPHP(PV).

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5

Cichoń, Jacek, e Karol Gotfryd. "Average Counting via Approximate Histograms". ACM Transactions on Sensor Networks 14, n. 2 (21 luglio 2018): 1–32. http://dx.doi.org/10.1145/3177922.

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6

Kirschenhofer, Peter, e Helmut Prodinger. "Approximate counting : an alternative approach". RAIRO - Theoretical Informatics and Applications 25, n. 1 (1991): 43–48. http://dx.doi.org/10.1051/ita/1991250100431.

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7

BORDEWICH, M., M. FREEDMAN, L. LOVÁSZ e D. WELSH. "Approximate Counting and Quantum Computation". Combinatorics, Probability and Computing 14, n. 5-6 (11 ottobre 2005): 737. http://dx.doi.org/10.1017/s0963548305007005.

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8

Flajolet, Philippe. "Approximate counting: A detailed analysis". BIT 25, n. 1 (marzo 1985): 113–34. http://dx.doi.org/10.1007/bf01934993.

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9

Erdős, Péter L., Sándor Z. Kiss, István Miklós e Lajos Soukup. "Approximate Counting of Graphical Realizations". PLOS ONE 10, n. 7 (10 luglio 2015): e0131300. http://dx.doi.org/10.1371/journal.pone.0131300.

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10

Aldous, David. "Approximate Counting via Markov Chains". Statistical Science 8, n. 1 (febbraio 1993): 16–19. http://dx.doi.org/10.1214/ss/1177011078.

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11

Dudek, Andrzej, Alan Frieze, Andrzej Ruciński e Matas Šileikis. "Approximate counting of regular hypergraphs". Information Processing Letters 113, n. 19-21 (settembre 2013): 785–88. http://dx.doi.org/10.1016/j.ipl.2013.07.018.

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12

Barvinok, Alexander. "Approximate counting via random optimization". Random Structures and Algorithms 11, n. 2 (settembre 1997): 187–98. http://dx.doi.org/10.1002/(sici)1098-2418(199709)11:2<187::aid-rsa6>3.0.co;2-o.

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13

Shaw, Arijit, Brendan Juba e Kuldeep S. Meel. "An Approximate Skolem Function Counter". Proceedings of the AAAI Conference on Artificial Intelligence 38, n. 8 (24 marzo 2024): 8108–16. http://dx.doi.org/10.1609/aaai.v38i8.28650.

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One approach to probabilistic inference involves counting the number of models of a given Boolean formula. Here, we are interested in inferences involving higher-order objects, i.e., functions. We study the following task: Given a Boolean specification between a set of inputs and outputs, count the number of functions of inputs such that the specification is met. Such functions are called Skolem functions. We are motivated by the recent development of scalable approaches to Boolean function synthesis. This stands in relation to our problem analogously to the relationship between Boolean satisfiability and the model counting problem. Yet, counting Skolem functions poses considerable new challenges. From the complexity-theoretic standpoint, counting Skolem functions is not only #P-hard; it is quite unlikely to have an FPRAS (Fully Polynomial Randomized Approximation Scheme) as the problem of synthesizing a Skolem function remains challenging, even given access to an NP oracle. The primary contribution of this work is the first algorithm, SkolemFC, that computes the number of Skolem functions. SkolemFC relies on technical connections between counting functions and propositional model counting: our algorithm makes a linear number of calls to an approximate model counter and computes an estimate of the number of Skolem functions with theoretical guarantees. Our prototype displays impressive scalability, handling benchmarks comparably to state-of-the-art Skolem function synthesis engines, even though counting all such functions ostensibly poses a greater challenge than synthesizing a single function.

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14

Gall, Francois Le, e Iu-Iong Ng. "Quantum approximate counting for Markov chains and collision counting". Quantum Information and Computation 22, n. 15&16 (novembre 2022): 1261. http://dx.doi.org/10.26421/qic22.15-16-1.

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In this paper we show how to generalize the quantum approximate counting technique developed by Brassard, H{\o}yer and Tapp [ICALP 1998] to a more general setting: estimating the number of marked states of a Markov chain (a Markov chain can be seen as a random walk over a graph with weighted edges). This makes it possible to construct quantum approximate counting algorithms from quantum search algorithms based on the powerful ``quantum walk based search'' framework established by Magniez, Nayak, Roland and Santha [SIAM Journal on Computing 2011]. As an application, we apply this approach to the quantum element distinctness algorithm by Ambainis [SIAM Journal on Computing 2007]: for two injective functions over a set of $N$ elements, we obtain a quantum algorithm that estimates the number $m$ of collisions of the two functions within relative error $\epsilon$ by making $\tilde{O}\left(\frac{1}{\epsilon^{25/24}}\big(\frac{N}{\sqrt{m}}\big)^{2/3}\right)$ queries, which gives an improvement over the $\Theta\big(\frac{1}{\epsilon}\frac{N}{\sqrt{m}}\big)$-query classical algorithm based on random sampling when $m\ll N$.

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15

Wang, Jinyan, Minghao Yin e Jingli Wu. "Two approximate algorithms for model counting". Theoretical Computer Science 657 (gennaio 2017): 28–37. http://dx.doi.org/10.1016/j.tcs.2016.04.047.

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16

Shaltiel, Ronen, e Christopher Umans. "Pseudorandomness for Approximate Counting and Sampling". computational complexity 15, n. 4 (dicembre 2006): 298–341. http://dx.doi.org/10.1007/s00037-007-0218-9.

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17

Viola, Emanuele. "Randomness Buys Depth for Approximate Counting". computational complexity 23, n. 3 (8 gennaio 2014): 479–508. http://dx.doi.org/10.1007/s00037-013-0076-6.

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18

Chan, Timothy M., e Bryan T. Wilkinson. "Adaptive and Approximate Orthogonal Range Counting". ACM Transactions on Algorithms 12, n. 4 (2 settembre 2016): 1–15. http://dx.doi.org/10.1145/2830567.

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19

Afshani, Peyman, e Timothy M. Chan. "On Approximate Range Counting and Depth". Discrete & Computational Geometry 42, n. 1 (30 aprile 2009): 3–21. http://dx.doi.org/10.1007/s00454-009-9177-z.

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20

Miyata, Takahisa, e Tadashi Watanabe. "Approximate resolutions and box-counting dimension". Topology and its Applications 132, n. 1 (luglio 2003): 49–69. http://dx.doi.org/10.1016/s0166-8641(02)00362-0.

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21

Meel, Kuldeep S., Supratik Chakraborty e S. Akshay. "Auditable Algorithms for Approximate Model Counting". Proceedings of the AAAI Conference on Artificial Intelligence 38, n. 9 (24 marzo 2024): 10654–61. http://dx.doi.org/10.1609/aaai.v38i9.28936.

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The problem of model counting, i.e., counting satisfying assignments of a Boolean formula, is a fundamental problem in computer science, with diverse applications. Given #P-hardness of the problem, many algorithms have been developed over the years to provide an approximate model count. Recently, building on the practical success of SAT-solvers used as NP oracles, the focus has shifted from theory to practical implementations of such algorithms. This has brought to focus new challenges. In this paper, we consider one such challenge – that of auditable deterministic approximate model counters wherein a counter should also generate a certificate, which allows a user (often with limited computational power) to independently audit whether the count returned by an invocation of the algorithm is indeed within the promised bounds. We start by examining a celebrated approximate model counting algorithm due to Stockmeyer that uses polynomially many calls to a \Sigma^2_P oracle, and show that it can be audited via a \Pi^2_P formula on (n^2 log^2 n) variables, where n is the number of variables in the original formula. Since n is often large (10’s to 100’s of thousands) for typical instances, we ask if the count of variables in the certificate formula can be reduced – a critical question towards potential implementation. We show that this improvement in certification can be achieved with a tradeoff in the counting algorithm’s complexity. Specifically, we develop new deterministic approximate model counting algorithms that invoke a \Sigma^3_P oracle, but can be certified using a \Pi^2_P formula on fewer variables: our final algorithm uses just (n log n) variables. Our study demonstrates that one can simplify certificate checking significantly if we allow the counting algorithm to access a slightly more powerful oracle. We believe this shows for the first time how the audit complexity can be traded for the complexity of approximate counting.

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22

Kabir, Mohimenul, Flavio O. Everardo, Ankit K. Shukla, Markus Hecher, Johannes Klaus Fichte e Kuldeep S. Meel. "ApproxASP – a Scalable Approximate Answer Set Counter". Proceedings of the AAAI Conference on Artificial Intelligence 36, n. 5 (28 giugno 2022): 5755–64. http://dx.doi.org/10.1609/aaai.v36i5.20518.

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Answer Set Programming (ASP) is a framework in artificial intelligence and knowledge representation for declarative modeling and problem solving. Modern ASP solvers focus on the computation or enumeration of answer sets. However, a variety of probabilistic applications in reasoning or logic programming require counting answer sets. While counting can be done by enumeration, simple enumeration becomes immediately infeasible if the number of solutions is high. On the other hand, approaches to exact counting are of high worst-case complexity. In fact, in propositional model counting, exact counting becomes impractical. In this work, we present a scalable approach to approximate counting for answer set programming. Our approach is based on systematically adding XOR constraints to ASP programs, which divide the search space. We prove that adding random XOR constraints partitions the answer sets of an ASP program. In practice, we use a Gaussian elimination-based approach by lifting ideas from SAT to ASP and integrating it into a state of the art ASP solver, which we call ApproxASP. Finally, our experimental evaluation shows the scalability of our approach over the existing ASP systems.

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23

Jeřábek, Emil. "Approximate counting by hashing in bounded arithmetic". Journal of Symbolic Logic 74, n. 3 (settembre 2009): 829–60. http://dx.doi.org/10.2178/jsl/1245158087.

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AbstractWe show how to formalize approximate counting via hash functions in subsystems of bounded arithmetic, using variants of the weak pigeonhole principle. We discuss several applications, including a proof of the tournament principle, and an improvement on the known relationship of the collapse of the bounded arithmetic hierarchy to the collapse of the polynomial-time hierarchy.

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24

Andrés Montoya, J. "On the parameterized complexity of approximate counting". RAIRO - Theoretical Informatics and Applications 45, n. 2 (aprile 2011): 197–223. http://dx.doi.org/10.1051/ita/2011007.

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25

Barvinok, A., e A. Samorodnitsky. "The distance approach to approximate combinatorial counting". Geometric And Functional Analysis 11, n. 5 (1 dicembre 2001): 871–99. http://dx.doi.org/10.1007/s00039-001-8219-3.

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26

Dyer, Martin, Leslie Ann Goldberg, Catherine Greenhill e Mark Jerrum. "The Relative Complexity of Approximate Counting Problems". Algorithmica 38, n. 3 (10 dicembre 2003): 471–500. http://dx.doi.org/10.1007/s00453-003-1073-y.

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27

Abboud, Ralph, Ismail Ceylan e Thomas Lukasiewicz. "Learning to Reason: Leveraging Neural Networks for Approximate DNF Counting". Proceedings of the AAAI Conference on Artificial Intelligence 34, n. 04 (3 aprile 2020): 3097–104. http://dx.doi.org/10.1609/aaai.v34i04.5705.

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Weighted model counting (WMC) has emerged as a prevalent approach for probabilistic inference. In its most general form, WMC is #P-hard. Weighted DNF counting (weighted #DNF) is a special case, where approximations with probabilistic guarantees are obtained in O(nm), where n denotes the number of variables, and m the number of clauses of the input DNF, but this is not scalable in practice. In this paper, we propose a neural model counting approach for weighted #DNF that combines approximate model counting with deep learning, and accurately approximates model counts in linear time when width is bounded. We conduct experiments to validate our method, and show that our model learns and generalizes very well to large-scale #DNF instances.

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28

Saha, Seemanta, Surendra Ghentiyala, Shihua Lu, Lucas Bang e Tevfik Bultan. "Obtaining Information Leakage Bounds via Approximate Model Counting". Proceedings of the ACM on Programming Languages 7, PLDI (6 giugno 2023): 1488–509. http://dx.doi.org/10.1145/3591281.

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Information leaks are a significant problem in modern software systems. In recent years, information theoretic concepts, such as Shannon entropy, have been applied to quantifying information leaks in programs. One recent approach is to use symbolic execution together with model counting constraints solvers in order to quantify information leakage. There are at least two reasons for unsoundness in quantifying information leakage using this approach: 1) Symbolic execution may not be able to explore all execution paths, 2) Model counting constraints solvers may not be able to provide an exact count. We present a sound symbolic quantitative information flow analysis that bounds the information leakage both for the cases where the program behavior is not fully explored and the model counting constraint solver is unable to provide a precise model count but provides an upper and a lower bound. We implemented our approach as an extension to KLEE for computing sound bounds for information leakage in C programs.

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29

Dell, Holger, e John Lapinskas. "Fine-Grained Reductions from Approximate Counting to Decision". ACM Transactions on Computation Theory 13, n. 2 (giugno 2021): 1–24. http://dx.doi.org/10.1145/3442352.

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In this article, we introduce a general framework for fine-grained reductions of approximate counting problems to their decision versions. (Thus, we use an oracle that decides whether any witness exists to multiplicatively approximate the number of witnesses with minimal overhead.) This mirrors a foundational result of Sipser (STOC 1983) and Stockmeyer (SICOMP 1985) in the polynomial-time setting, and a similar result of Müller (IWPEC 2006) in the FPT setting. Using our framework, we obtain such reductions for some of the most important problems in fine-grained complexity: the Orthogonal Vectors problem, 3SUM, and the Negative-Weight Triangle problem (which is closely related to All-Pairs Shortest Path). While all these problems have simple algorithms over which it is conjectured that no polynomial improvement is possible, our reductions would remain interesting even if these conjectures were proved; they have only polylogarithmic overhead and can therefore be applied to subpolynomial improvements such as the n 3 / exp(Θ (√ log n ))-time algorithm for the Negative-Weight Triangle problem due to Williams (STOC 2014). Our framework is also general enough to apply to versions of the problems for which more efficient algorithms are known. For example, the Orthogonal Vectors problem over GF( m ) d for constant m can be solved in time n · poly ( d ) by a result of Williams and Yu (SODA 2014); our result implies that we can approximately count the number of orthogonal pairs with essentially the same running time. We also provide a fine-grained reduction from approximate #SAT to SAT. Suppose the Strong Exponential Time Hypothesis (SETH) is false, so that for some 1 < c < 2 and all k there is an O ( c n )-time algorithm for k -SAT. Then we prove that for all k , there is an O (( c + o (1)) n )-time algorithm for approximate # k -SAT. In particular, our result implies that the Exponential Time Hypothesis (ETH) is equivalent to the seemingly weaker statement that there is no algorithm to approximate #3-SAT to within a factor of 1+ɛ in time 2 o ( n )/ ɛ 2 (taking ɛ > 0 as part of the input).

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30

Aspnes, James, e Keren Censor. "Approximate shared-memory counting despite a strong adversary". ACM Transactions on Algorithms 6, n. 2 (marzo 2010): 1–23. http://dx.doi.org/10.1145/1721837.1721841.

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31

Bulatov, Andrei A., e Stanislav Živný. "Approximate Counting CSP Seen from the Other Side". ACM Transactions on Computation Theory 12, n. 2 (14 maggio 2020): 1–19. http://dx.doi.org/10.1145/3389390.

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32

Prodinger, Helmut. "Approximate counting with m counters: A detailed analysis". Theoretical Computer Science 439 (giugno 2012): 58–68. http://dx.doi.org/10.1016/j.tcs.2012.03.016.

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33

Sonntag, Dag, Jose M. Peña e Manuel Gómez-Olmedo. "Approximate Counting of Graphical Models via MCMC Revisited". International Journal of Intelligent Systems 30, n. 3 (24 dicembre 2014): 384–420. http://dx.doi.org/10.1002/int.21704.

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34

Lai, Yong, Kuldeep S. Meel e Roland H. C. Yap. "Fast Converging Anytime Model Counting". Proceedings of the AAAI Conference on Artificial Intelligence 37, n. 4 (26 giugno 2023): 4025–34. http://dx.doi.org/10.1609/aaai.v37i4.25517.

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Model counting is a fundamental problem which has been influential in many applications, from artificial intelligence to formal verification. Due to the intrinsic hardness of model counting, approximate techniques have been developed to solve real-world instances of model counting. This paper designs a new anytime approach called PartialKC for approximate model counting. The idea is a form of partial knowledge compilation to provide an unbiased estimate of the model count which can converge to the exact count. Our empirical analysis demonstrates that PartialKC achieves significant scalability and accuracy over prior state-of-the-art approximate counters, including satss and STS. Interestingly, the empirical results show that PartialKC reaches convergence for many instances and therefore provides exact model counting performance comparable to state-of-the-art exact counters.

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35

Zhang, Fangyuan, Dechuang Chen, Sibo Wang, Yin Yang e Junhao Gan. "Scalable Approximate Butterfly and Bi-triangle Counting for Large Bipartite Networks". Proceedings of the ACM on Management of Data 1, n. 4 (8 dicembre 2023): 1–26. http://dx.doi.org/10.1145/3626753.

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A bipartite graph is a graph that consists of two disjoint sets of vertices and only edges between vertices from different vertex sets. In this paper, we study the counting problems of two common types of em motifs in bipartite graphs: (i) butterflies (2x2 bicliques) and (ii) bi-triangles (length-6 cycles). Unlike most of the existing algorithms that aim to obtain exact counts, our goal is to obtain precise enough estimations of these counts in bipartite graphs, as such estimations are already sufficient and of great usefulness in various applications. While there exist approximate algorithms for butterfly counting, these algorithms are mainly based on the techniques designed for general graphs, and hence, they are less effective on bipartite graphs. Not to mention that there is still a lack of study on approximate bi-triangle counting. Motivated by this, we first propose a novel butterfly counting algorithm, called one-sided weighted sampling, which is tailored for bipartite graphs. The basic idea of this algorithm is to estimate the total butterfly count with the number of butterflies containing two randomly sampled vertices from the same side of the two vertex sets. We prove that our estimation is unbiased, and our technique can be further extended (non-trivially) for bi-triangle count estimation. Theoretical analyses under a power-law random bipartite graph model and extensive experiments on multiple large real datasets demonstrate that our proposed approximate counting algorithms can reach high accuracy, yet achieve up to three orders (resp. four orders) of magnitude speed-up over the state-of-the-art exact butterfly (resp. bi-triangle) counting algorithms. Additionally, we present an approximate clustering coefficient estimation framework for bipartite graphs, which shows a similar speed-up over the exact solutions with less than 1% relative error.

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36

Ge, Cunjing. "Approximate Integer Solution Counts over Linear Arithmetic Constraints". Proceedings of the AAAI Conference on Artificial Intelligence 38, n. 8 (24 marzo 2024): 8022–29. http://dx.doi.org/10.1609/aaai.v38i8.28640.

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Counting integer solutions of linear constraints has found interesting applications in various fields. It is equivalent to the problem of counting lattice points inside a polytope. However, state-of-the-art algorithms for this problem become too slow for even a modest number of variables. In this paper, we propose a new framework to approximate the lattice counts inside a polytope with a new random-walk sampling method. The counts computed by our approach has been proved approximately bounded by a (epsilon, delta)-bound. Experiments on extensive benchmarks show that our algorithm could solve polytopes with dozens of dimensions, which significantly outperforms state-of-the-art counters.

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Vartziotis, Dimitris, e Joachim Wipper. "The Fractal Nature of an Approximate Prime Counting Function". Fractal and Fractional 1, n. 1 (8 novembre 2017): 10. http://dx.doi.org/10.3390/fractalfract1010010.

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38

Wojciechowski, J. "An approximate formula for counting trees in a graph". IEEE Transactions on Circuits and Systems 32, n. 4 (aprile 1985): 382–85. http://dx.doi.org/10.1109/tcs.1985.1085721.

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Wei, Zhewei, e Ke Yi. "Tight Space Bounds for Two-Dimensional Approximate Range Counting". ACM Transactions on Algorithms 14, n. 2 (4 giugno 2018): 1–17. http://dx.doi.org/10.1145/3205454.

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40

Cvetkovski, Andrej. "An algorithm for approximate counting using limited memory resources". ACM SIGMETRICS Performance Evaluation Review 35, n. 1 (12 giugno 2007): 181–90. http://dx.doi.org/10.1145/1269899.1254903.

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41

Jones, J. A., e M. Mosca. "Approximate Quantum Counting on an NMR Ensemble Quantum Computer". Physical Review Letters 83, n. 5 (2 agosto 1999): 1050–53. http://dx.doi.org/10.1103/physrevlett.83.1050.

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42

G. Groer, P. "Exact and Approximate Bayesian Estimation of Net Counting Rates". Radiation Protection Dosimetry 102, n. 3 (1 novembre 2002): 265–68. http://dx.doi.org/10.1093/oxfordjournals.rpd.a006095.

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43

Atserias, Albert, e Neil Thapen. "The Ordering Principle in a Fragment of Approximate Counting". ACM Transactions on Computational Logic 15, n. 4 (agosto 2014): 1–11. http://dx.doi.org/10.1145/2629555.

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44

Pandey, Prashant, Michael A. Bender, Rob Johnson e Rob Patro. "Squeakr: an exact and approximate k-mer counting system". Bioinformatics 34, n. 4 (9 ottobre 2017): 568–75. http://dx.doi.org/10.1093/bioinformatics/btx636.

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45

Zhou, Jinhong, Chao Wang, Xi Li e Xuehai Zhou. "Fast approximate hash table using extended counting Bloom filter". International Journal of Computational Science and Engineering 11, n. 4 (2015): 380. http://dx.doi.org/10.1504/ijcse.2015.073497.

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46

Yamakami, Tomoyuki. "Approximate counting for complex-weighted Boolean constraint satisfaction problems". Information and Computation 219 (ottobre 2012): 17–38. http://dx.doi.org/10.1016/j.ic.2012.08.002.

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47

Sinclair, Alistair, e Mark Jerrum. "Approximate counting, uniform generation and rapidly mixing Markov chains". Information and Computation 82, n. 1 (luglio 1989): 93–133. http://dx.doi.org/10.1016/0890-5401(89)90067-9.

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48

Su, Na, Zhe Hui Wu, Ji Min Liu, Tai An Liu, Xin Jun An e Chang Qing Yan. "Mining Approximate Frequent Itemsets over Data Streams". Applied Mechanics and Materials 685 (ottobre 2014): 536–39. http://dx.doi.org/10.4028/www.scientific.net/amm.685.536.

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This paper proposes a method based on Lossy Counting to mine frequent itemsets. Logarithmic tilted time window is adopted to emphasize the importance of recent data. Multilayer count queue framework is used to avoid the counter overflowing and query top-Kitemsets quickly using a index table.

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49

Obster, Dennis, e Naoki Sasakura. "Counting Tensor Rank Decompositions". Universe 7, n. 8 (15 agosto 2021): 302. http://dx.doi.org/10.3390/universe7080302.

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Tensor rank decomposition is a useful tool for geometric interpretation of the tensors in the canonical tensor model (CTM) of quantum gravity. In order to understand the stability of this interpretation, it is important to be able to estimate how many tensor rank decompositions can approximate a given tensor. More precisely, finding an approximate symmetric tensor rank decomposition of a symmetric tensor Q with an error allowance Δ is to find vectors ϕi satisfying ∥Q−∑i=1Rϕi⊗ϕi⋯⊗ϕi∥2≤Δ. The volume of all such possible ϕi is an interesting quantity which measures the amount of possible decompositions for a tensor Q within an allowance. While it would be difficult to evaluate this quantity for each Q, we find an explicit formula for a similar quantity by integrating over all Q of unit norm. The expression as a function of Δ is given by the product of a hypergeometric function and a power function. By combining new numerical analysis and previous results, we conjecture a formula for the critical rank, yielding an estimate for the spacetime degrees of freedom of the CTM. We also extend the formula to generic decompositions of non-symmetric tensors in order to make our results more broadly applicable. Interestingly, the derivation depends on the existence (convergence) of the partition function of a matrix model which previously appeared in the context of the CTM.

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50

Das, Mayukh, Devendra Singh Dhami, Gautam Kunapuli, Kristian Kersting e Sriraam Natarajan. "Fast Relational Probabilistic Inference and Learning: Approximate Counting via Hypergraphs". Proceedings of the AAAI Conference on Artificial Intelligence 33 (17 luglio 2019): 7816–24. http://dx.doi.org/10.1609/aaai.v33i01.33017816.

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Counting the number of true instances of a clause is arguably a major bottleneck in relational probabilistic inference and learning. We approximate counts in two steps: (1) transform the fully grounded relational model to a large hypergraph, and partially-instantiated clauses to hypergraph motifs; (2) since the expected counts of the motifs are provably the clause counts, approximate them using summary statistics (in/outdegrees, edge counts, etc). Our experimental results demonstrate the efficiency of these approximations, which can be applied to many complex statistical relational models, and can be significantly faster than state-of-the-art, both for inference and learning, without sacrificing effectiveness.

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