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Tinted, Detached, and Lazy CNF-XOR solving and its Applications to Counting and Sampling.
Mate Soos, Stephan Gocht and Kuldeep S. Meel.
In Proceedings of International Conference on Computer-Aided Verification (CAV), July 2020.
Given a Boolean formula, the problem of counting seeks to estimate the number of solutions of F while the problem of uniform sampling seeks to sample solutions uniformly at random. Counting and uniform sampling are fundamentalproblems in computer science with a wide range of applicationsranging from constrained random simulation, probabilistic inference to network reliability and beyond. Despite intense theoretical and empirical investigations, development of scalable techniques for sampling and counting without sacrificing theoretical guarantees remains the holy grail. The past few years have witnessed the rise of hashing-based approaches that use XOR-based hashing and employ SAT solvers to solve the resulting CNF formulas conjuncted with XOR constraints. Since over 99% of the runtime of hashing-based techniques is spent inside the SAT queries, improving CNF-XOR solvers has emerged as a key challenge.In this paper, we identify the key performance bottlenecks in the recently proposed BIRD architecture, and we focus on overcoming these bottlenecks by accelerating the XOR handling within the SAT solver and on improving the solver integration through a smarter use of (partial) solutions. We integrate BIRD2 with the state of the art approximate model counter, ApproxMC3, and the state of the art almost-uniform modelsampler UniGen2. Through an extensive evaluation over a large benchmark set of over 1896 instances, we observe that BIRD2 leads to consistent speed up for both counting and sampling, and in particular, we solve 77 and 51 more instances for counting and sampling respectively.
@inproceedings{SGM20,
title={Tinted, Detached, and Lazy CNF-XOR solving and its Applications to Counting and Sampling},
author={Soos, Mate and Gocht, Stephan and Meel, Kuldeep S.},
bib2html_pubtype={Refereed Conference},
booktitle=CAV,
month=jul,
bib2html_rescat={Solver Engineering,Counting, Sampling},
bib2html_dl_pdf={../Papers/cav20-sgm.pdf},
year={2020},
abstract={Given a Boolean formula, the problem of counting seeks to estimate the number of solutions of F while the problem of uniform sampling seeks to sample solutions uniformly at random. Counting and uniform sampling are fundamental
problems in computer science with a wide range of applications
ranging from constrained random simulation, probabilistic inference to network reliability and beyond. Despite intense theoretical and empirical investigations, development of scalable techniques for sampling and counting without
sacrificing theoretical guarantees remains the holy grail. The past few years have witnessed the rise of hashing-based approaches that use XOR-based hashing and employ SAT solvers to solve the resulting CNF formulas conjuncted
with XOR constraints. Since over 99\% of the runtime of hashing-based techniques is spent inside the SAT queries, improving CNF-XOR solvers has emerged as a key challenge.
In this paper, we identify the key performance bottlenecks in the recently proposed BIRD architecture, and we focus on overcoming these bottlenecks by
accelerating the XOR handling within the SAT solver and on improving the solver integration through a smarter use
of (partial) solutions. We integrate BIRD2 with the state of the art approximate model counter, ApproxMC3, and the state of the art almost-uniform model
sampler UniGen2. Through an extensive evaluation over a large benchmark set of over 1896 instances, we observe that BIRD2 leads to consistent speed up
for both counting and sampling, and in particular, we solve 77 and 51 more instances for counting and sampling respectively.
},
}
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