Comments (3)
This can be fixed by adding another precondition to the move
action: (not (= ?from ?to))
from pddl.jl.
You're right that (move rooma rooma)
is (strangely) available! I don't consider that bug though -- it's implied by the domain file for the gripper domain in the 1998 International Planning Competition. To add the (not (= ?from ?to))
precondition you suggested, the domain would need to have the equality
requirement as well in the requirements
field -- basic STRIPs doesn't support equality checking, which is why it's absent from this domain file.
After executing that action, there is no
robbyat
fact, and so all actions become illegal.
As for the above, I've just tried reproducing it on my end, and don't seem to be running into the same issue. Could you show an example? This seems to be working fine for me:
path = joinpath(dirname(pathof(PDDL)), "..", "test", "strips")
domain = load_domain(joinpath(path, "domain.pddl"))
problem = load_problem(joinpath(path, "problem.pddl"))
state = initstate(domain, problem)
next_state = execute(domain, state, pddl"(move rooma rooma)")
@assert state == next_state
@assert !isempty(collect(available(domain, next_state)))
from pddl.jl.
Thanks for the detailed explanation. I actually can't reproduce that behavior either, so I'm not sure what I was seeing earlier but it might be unrelated to PDDL.jl.
from pddl.jl.
Related Issues (16)
- Create Problem instance from code HOT 1
- Towers of Hanoi Issue HOT 1
- Trouble running the execute function HOT 1
- Adding PDDL+ for temporal planning HOT 8
- Generating all grounded actions for a problem instance HOT 3
- Action precondition `(not (= ?a ?b))` doesn't work HOT 6
- Confusion over the `_extras` field of `Domain` HOT 2
- `Base.propertynames(::Domain)` is ambiguous HOT 1
- Failed at parsing sokoban problems from HOT 2
- Constraints unintuitive? HOT 3
- Hierarchical Planning HOT 2
- Error when compiling states HOT 2
- Compiler returns no solution HOT 10
- forall when PDDL failure HOT 3
- How to get grounded predicates and functions HOT 2
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from pddl.jl.