Synthesis with clairvoyance

Orna Kupferman*, Dorsa Sadigh, Sanjit A. Seshia

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

We consider the problem of automatically synthesizing, from a linear temporal logic (LTL) specification, a system that is guaranteed to satisfy the specification with respect to all environments. Algorithms for solving the synthesis problem reduce it to the solution of a game played between the system and its environment, in which the system and environment alternate between generating outputs and inputs respectively. Typically, the system is required to generate an output right after receiving the current input. If a solution to the game exists, the specification is said to be realizable. In this paper, we consider the role of clairvoyance in synthesis, in which the system can look into the future, basing its output upon future inputs. An infinite look-ahead transforms the realizability problem into a problem known as universal satisfiability. A thesis we explore in this paper is that the notion of clairvoyance is useful as a heuristic even in the general case of synthesis, when there is no lookahead. Specifically, we suggest a heuristic in which we search for strategies where the system and the environment try to force each other into hopeless states in the game states from which they cannot win, no matter how large the lookahead. The classification to hopeful and hopeless states is thus based on a modified notion of universal satisfiability where the output prefix is constrained. Our approach uses the automata for the specification in the process of classification into hopeful and hopeless states, and uses the structure of the automata in order to construct the game graph, but the important point is that the game itself is a reachability game. We demonstrate the efficiency of our approach with examples, and outline some directions for future work exploring the proposed approach.

Original languageAmerican English
Title of host publicationHardware and Software
Subtitle of host publicationVerification and Testing - 7th International Haifa Verification Conference, HVC 2011, Revised Selected Papers
Pages5-19
Number of pages15
DOIs
StatePublished - 2012
Event7th International Haifa Verification Conference, HVC 2011 - Haifa, Israel
Duration: 6 Dec 20118 Dec 2011

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume7261 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Conference

Conference7th International Haifa Verification Conference, HVC 2011
Country/TerritoryIsrael
CityHaifa
Period6/12/118/12/11

Bibliographical note

Funding Information:
This research was supported in part by NSF grant CNS-0644436 and the Gigascale Systems Research Center, one of six research centers funded under the Focus Center Research Program (FCRP), a Semiconductor Research Corporation entity.

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