[{"conference":{"name":"AAAI: Conference on Artificial Intelligence","end_date":"2016-02-17","start_date":"2016-02-12","location":"Phoenix, AZ, USA"},"month":"12","date_created":"2018-12-11T11:50:30Z","status":"public","intvolume":"      2016","publist_id":"6191","publisher":"AAAI Press","date_published":"2016-12-02T00:00:00Z","page":"3225 - 3232","volume":2016,"project":[{"name":"Modern Graph Algorithmic Techniques in Formal Verification","grant_number":"P 23499-N23","call_identifier":"FWF","_id":"2584A770-B435-11E9-9278-68D0E5697425"},{"_id":"25832EC2-B435-11E9-9278-68D0E5697425","call_identifier":"FWF","grant_number":"S 11407_N23","name":"Rigorous Systems Engineering"},{"name":"Quantitative Graph Games: Theory and Applications","grant_number":"279307","call_identifier":"FP7","_id":"2581B60A-B435-11E9-9278-68D0E5697425"}],"abstract":[{"text":"POMDPs are standard models for probabilistic planning problems, where an agent interacts with an uncertain environment. We study the problem of almost-sure reachability, where given a set of target states, the question is to decide whether there is a policy to ensure that the target set is reached with probability 1 (almost-surely). While in general the problem is EXPTIMEcomplete, in many practical cases policies with a small amount of memory suffice. Moreover, the existing solution to the problem is explicit, which first requires to construct explicitly an exponential reduction to a belief-support MDP. In this work, we first study the existence of observation-stationary strategies, which is NP-complete, and then small-memory strategies. We present a symbolic algorithm by an efficient encoding to SAT and using a SAT solver for the problem. We report experimental results demonstrating the scalability of our symbolic (SAT-based) approach. © 2016, Association for the Advancement of Artificial Intelligence (www.aaai.org). All rights reserved.","lang":"eng"}],"publication_status":"published","publication":"Proceedings of the Thirtieth AAAI Conference on Artificial Intelligence","ec_funded":1,"title":"A symbolic SAT based algorithm for almost sure reachability with small strategies in pomdps","_id":"1166","department":[{"_id":"KrCh"},{"_id":"ToHe"}],"language":[{"iso":"eng"}],"related_material":{"link":[{"relation":"table_of_contents","url":"https://dl.acm.org/citation.cfm?id=3016355"}],"record":[{"relation":"earlier_version","status":"public","id":"5443"}]},"oa_version":"None","type":"conference","date_updated":"2023-02-23T12:26:41Z","year":"2016","day":"02","citation":{"ama":"Chatterjee K, Chmelik M, Davies J. A symbolic SAT based algorithm for almost sure reachability with small strategies in pomdps. In: <i>Proceedings of the Thirtieth AAAI Conference on Artificial Intelligence</i>. Vol 2016. AAAI Press; 2016:3225-3232.","ieee":"K. Chatterjee, M. Chmelik, and J. Davies, “A symbolic SAT based algorithm for almost sure reachability with small strategies in pomdps,” in <i>Proceedings of the Thirtieth AAAI Conference on Artificial Intelligence</i>, Phoenix, AZ, USA, 2016, vol. 2016, pp. 3225–3232.","ista":"Chatterjee K, Chmelik M, Davies J. 2016. A symbolic SAT based algorithm for almost sure reachability with small strategies in pomdps. Proceedings of the Thirtieth AAAI Conference on Artificial Intelligence. AAAI: Conference on Artificial Intelligence vol. 2016, 3225–3232.","short":"K. Chatterjee, M. Chmelik, J. Davies, in:, Proceedings of the Thirtieth AAAI Conference on Artificial Intelligence, AAAI Press, 2016, pp. 3225–3232.","chicago":"Chatterjee, Krishnendu, Martin Chmelik, and Jessica Davies. “A Symbolic SAT Based Algorithm for Almost Sure Reachability with Small Strategies in Pomdps.” In <i>Proceedings of the Thirtieth AAAI Conference on Artificial Intelligence</i>, 2016:3225–32. AAAI Press, 2016.","apa":"Chatterjee, K., Chmelik, M., &#38; Davies, J. (2016). A symbolic SAT based algorithm for almost sure reachability with small strategies in pomdps. In <i>Proceedings of the Thirtieth AAAI Conference on Artificial Intelligence</i> (Vol. 2016, pp. 3225–3232). Phoenix, AZ, USA: AAAI Press.","mla":"Chatterjee, Krishnendu, et al. “A Symbolic SAT Based Algorithm for Almost Sure Reachability with Small Strategies in Pomdps.” <i>Proceedings of the Thirtieth AAAI Conference on Artificial Intelligence</i>, vol. 2016, AAAI Press, 2016, pp. 3225–32."},"author":[{"orcid":"0000-0002-4561-241X","full_name":"Chatterjee, Krishnendu","id":"2E5DCA20-F248-11E8-B48F-1D18A9856A87","last_name":"Chatterjee","first_name":"Krishnendu"},{"full_name":"Chmelik, Martin","id":"3624234E-F248-11E8-B48F-1D18A9856A87","last_name":"Chmelik","first_name":"Martin"},{"first_name":"Jessica","last_name":"Davies","full_name":"Davies, Jessica","id":"378E0060-F248-11E8-B48F-1D18A9856A87"}],"user_id":"3E5EF7F0-F248-11E8-B48F-1D18A9856A87","quality_controlled":"1"},{"publication_identifier":{"issn":["2664-1690"]},"alternative_title":["IST Austria Technical Report"],"status":"public","date_created":"2018-12-12T11:39:22Z","month":"11","page":"23","pubrep_id":"362","date_published":"2015-11-06T00:00:00Z","file":[{"file_size":412379,"creator":"system","content_type":"application/pdf","relation":"main_file","date_created":"2018-12-12T11:53:05Z","checksum":"f0fa31ad8161ed655137e94012123ef9","file_name":"IST-2015-325-v2+1_main.pdf","access_level":"open_access","date_updated":"2020-07-14T12:46:57Z","file_id":"5466"}],"publisher":"IST Austria","file_date_updated":"2020-07-14T12:46:57Z","ddc":["000"],"language":[{"iso":"eng"}],"doi":"10.15479/AT:IST-2015-325-v2-1","related_material":{"record":[{"relation":"later_version","status":"public","id":"1166"}]},"oa":1,"_id":"5443","department":[{"_id":"KrCh"}],"has_accepted_license":"1","title":"A symbolic SAT-based algorithm for almost-sure reachability with small strategies in POMDPs","publication_status":"published","abstract":[{"text":"POMDPs are standard models for probabilistic planning problems, where an agent interacts with an uncertain environment. We study the problem of almost-sure reachability, where given a set of target states, the question is to decide whether there is a policy to ensure that the target set is reached with probability 1 (almost-surely). While in general the problem is EXPTIME-complete, in many practical cases policies with a small amount of memory suffice. Moreover, the existing solution to the problem is explicit, which first requires to construct explicitly an exponential reduction to a belief-support MDP. In this work, we first study the existence of observation-stationary strategies, which is NP-complete, and then small-memory strategies. We present a symbolic algorithm by an efficient encoding to SAT and using a SAT solver for the problem. We report experimental results demonstrating the scalability of our symbolic (SAT-based) approach.","lang":"eng"}],"author":[{"first_name":"Krishnendu","last_name":"Chatterjee","id":"2E5DCA20-F248-11E8-B48F-1D18A9856A87","full_name":"Chatterjee, Krishnendu","orcid":"0000-0002-4561-241X"},{"first_name":"Martin","last_name":"Chmelik","full_name":"Chmelik, Martin","id":"3624234E-F248-11E8-B48F-1D18A9856A87"},{"id":"378E0060-F248-11E8-B48F-1D18A9856A87","full_name":"Davies, Jessica","last_name":"Davies","first_name":"Jessica"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"ieee":"K. Chatterjee, M. Chmelik, and J. Davies, <i>A symbolic SAT-based algorithm for almost-sure reachability with small strategies in POMDPs</i>. IST Austria, 2015.","ama":"Chatterjee K, Chmelik M, Davies J. <i>A Symbolic SAT-Based Algorithm for Almost-Sure Reachability with Small Strategies in POMDPs</i>. IST Austria; 2015. doi:<a href=\"https://doi.org/10.15479/AT:IST-2015-325-v2-1\">10.15479/AT:IST-2015-325-v2-1</a>","ista":"Chatterjee K, Chmelik M, Davies J. 2015. A symbolic SAT-based algorithm for almost-sure reachability with small strategies in POMDPs, IST Austria, 23p.","short":"K. Chatterjee, M. Chmelik, J. Davies, A Symbolic SAT-Based Algorithm for Almost-Sure Reachability with Small Strategies in POMDPs, IST Austria, 2015.","chicago":"Chatterjee, Krishnendu, Martin Chmelik, and Jessica Davies. <i>A Symbolic SAT-Based Algorithm for Almost-Sure Reachability with Small Strategies in POMDPs</i>. IST Austria, 2015. <a href=\"https://doi.org/10.15479/AT:IST-2015-325-v2-1\">https://doi.org/10.15479/AT:IST-2015-325-v2-1</a>.","mla":"Chatterjee, Krishnendu, et al. <i>A Symbolic SAT-Based Algorithm for Almost-Sure Reachability with Small Strategies in POMDPs</i>. IST Austria, 2015, doi:<a href=\"https://doi.org/10.15479/AT:IST-2015-325-v2-1\">10.15479/AT:IST-2015-325-v2-1</a>.","apa":"Chatterjee, K., Chmelik, M., &#38; Davies, J. (2015). <i>A symbolic SAT-based algorithm for almost-sure reachability with small strategies in POMDPs</i>. IST Austria. <a href=\"https://doi.org/10.15479/AT:IST-2015-325-v2-1\">https://doi.org/10.15479/AT:IST-2015-325-v2-1</a>"},"day":"06","year":"2015","date_updated":"2023-02-21T16:24:05Z","type":"technical_report","oa_version":"Published Version"}]