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Lesson 23 - Module 9 Planning Version 1 CSE IIT Kharagpur...

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Module 9 Planning Version 1 CSE IIT, Kharagpur
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Lesson 23 Planning systems Version 1 CSE IIT, Kharagpur
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9.3 Planning Systems Classical Planners use the STRIPS (Stanford Research Institute Problem Solver) language to describe states and operators. It is an efficient way to represent planning algorithms. 9.3.1 Representation of States and Goals States are represented by conjunctions of function-free ground literals, that is, predicates applied to constant symbols, possibly negated. An example of an initial state is: At(Home) /\ - Have(Milk) /\ - Have(Bananas) /\ - Have(Drill) /\ ... A state description does not have to be complete. We just want to obtain a successful plan to a set of possible complete states. But if it does not mention a given positive literal, then the literal can be assumed to be false. Goals are a conjunction of literals. Therefore the goal is At(Home) /\ Have(Milk) /\ Have(Bananas) /\ Have(Drill) Goals can also contain variables. Being at a store that sells milk is equivalent to At(x) /\ Sells(x,Milk)
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