Respuesta :
Following is the required PDDL program for plan generation
(adult1 Adult)
(adult2 Adult)
(child1 Child)
(child2 Child)
(boat Boat)
(preconditions
(left adult1) (left adult2) (left child1) (left child2) (left boat))
(effects
(right adult1) (right adult2) (right child1) (right child1) (right boat)
(operator
travel-adult
(parameters
(<adult> Adult) (<boat> Boat))
(preconditions
(left <adult>) (left <boat>))
(effects
(right <adult>) (right<boat>) (del left <adult>) (del left <boat>)))
(operator
travel-child-right
(parameters
(<child1> Child) (<child2> Child) (<boat> Boat))
(preconditions
(left <child1>) (left <child2>) (left <boat>))
(effects
(right <child1>) (right <child2>) (right <boat>) (del left <child2>) (del left <child2>) (del left <boat>)))
(operator
travel-child-left
(parameters
(<child1> Child) (boat Boat))
(preconditions
(right <child1>) (right <boat>))
(effects
(left <child1>) (left <boat>) (del right <child1>) (del right <boat>)))
The initial state and goal state as per PDDL is given below.
Initial State: left(child1), left(child2), left(adult1), left(adult2) and left(boat).
Goal State: right(child1), right(child2), right(adult1), right(adult2) and right(boat).
We used, PDDL, to have a plan here, but what is PDDL exactly? PDDL stands for Planning Domain Definition Language and it is a group of programming languages. They are designed and developed to avail an end user the ability to define a planning problem. It is an attempt to standardize Artificial Intelligence planning languages.
The question is incomplete, complete question is as follows, Two adults and two children are on the left side of the river. They all want to cross to the right side of the river. However, the only means of transportation they can use is a boat (also initially on the left bank) which can carry either just one adult or one adult and one child or just one child or two children from one bank to the other bank. Any adult or child can operate the boat, but the boat cannot be operated without having at least one person on the boat. The goal is to come up with a plan for moving everyone from the left side to the right side using multiple boat trips. Describe the initial state and the goal, using PDDL. Define appropriate actions for this planning problem, in the PDDL language. For each action, provide a name, arguments, preconditions, and effects.
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