Cost-optimal and Net-benefit Planning--A Parameterised Complexity View [Elektronisk resurs]
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Aghighi, Meysam 1988- (författare)
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24th International Joint Conference on Artificial Intelligence (IJCAI-15)
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Bäckström, Christer (författare)
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- Linköpings universitet Institutionen för datavetenskap (utgivare)
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Alternativt namn: Engelska : Linköping Institute of Technology. Department of Computer and Information Science
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Alternativt namn: Engelska : Linköping University. Department of computer and Information Science
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Alternativt namn: IDA
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Linköpings universitet Tekniska fakulteten (utgivare)
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TCSLAB (medarbetare)
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TCSLAB (medarbetare)
- 2015
- Engelska.
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Ingår i: 24th International Joint Conference on Artificial Intelligence (IJCAI-15).
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Sammanfattning
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- Cost-optimal planning (COP) uses action costs and asks for a minimum-cost plan. It is sometimes assumed that there is no harm in using actions with zero cost or rational cost. Classical complexity analysis does not contradict this assumption; planning is PSPACE-complete regardless of whether action costs are positive or non-negative, integer or rational. We thus apply parameterised complexity analysis to shed more light on this issue. Our main results are the following. COP is W[2]-complete for positive integer costs, i.e. it is no harder than finding a minimum-length plan, but it is para-NPhard if the costs are non-negative integers or positive rationals. This is a very strong indication that the latter cases are substantially harder. Net-benefit planning (NBP) additionally assigns goal utilities and asks for a plan with maximum difference between its utility and its cost. NBP is para-NP-hard even when action costs and utilities are positive integers, suggesting that it is harder than COP. In addition, we also analyse a large number of subclasses, using both the PUBS restrictions and restricting the number of preconditions and effects.
Ämnesord
- Engineering and Technology (hsv)
- Civil Engineering (hsv)
- Transport Systems and Logistics (hsv)
- Teknik och teknologier (hsv)
- Samhällsbyggnadsteknik (hsv)
- Transportteknik och logistik (hsv)
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