Symbolic Model Checking of Weighted PCTL Using Dependency Graphs

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Abstract

We present a global and local algorithm for model checking a weighted variant of PCTL with upper-bound weight constraints, on probabilistic weighted Kripke structures where the weights are vectors with non-zero magnitude. Both algorithms under- and over approximate a fixed-point over a symbolic dependency graph, until sufficient evidence to prove or disprove the given formula is found. Fixed-point computations are carried out in the domain of (multidimensional) probabilistic step functions, encoded as interval decision diagrams. The global algorithm works similarly to classic value iteration for PCTL in that it evaluates all nodes of the dependency graph iteratively, while the local algorithm performs a search-like evaluation of the given dependency graph in an attempt to find enough evidence locally to prove/disprove a given formula, without having to evaluate all nodes. Both algorithms are evaluated on several experiments and we show that the local algorithm generally outperforms the global algorithm.
OriginalsprogEngelsk
TitelNASA Formal Methods - 11th International Symposium, NFM 2019, Proceedings
RedaktørerKristin Yvonne Rozier, Julia M. Badger
Antal sider18
ForlagSpringer
Publikationsdato2019
Sider298-315
ISBN (Trykt)978-3-030-20651-2
ISBN (Elektronisk)978-3-030-20652-9
DOI
StatusUdgivet - 2019
BegivenhedNFM19: 11th Annual NASA Formal Methods Symposium: Challenges for Future Exploration - Rice University, Houston, USA
Varighed: 7 maj 20199 maj 2019
Konferencens nummer: 11
https://robonaut.jsc.nasa.gov/R2/pages/nfm2019.html

Konference

KonferenceNFM19: 11th Annual NASA Formal Methods Symposium
Nummer11
LokationRice University
Land/OmrådeUSA
ByHouston
Periode07/05/201909/05/2019
Internetadresse
NavnLecture Notes in Computer Science
Vol/bind11460
ISSN0302-9743

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