4442
Comment:
|
4415
|
Deletions are marked like this. | Additions are marked like this. |
Line 5: | Line 5: |
'''Warning:''' See [[OptionCaveats|OptionCaveats]] for using cost types with Landmarks | This plugin type can be predefined using {{{--landmarks}}}. |
A landmark factory specification is either a newly created instance or a landmark factory that has been defined previously. This page describes how one can specify a new landmark factory instance. For re-using landmark factories, see Landmark Predefinitions.
This plugin type can be predefined using --landmarks.
Exhaustive Landmarks
Exhaustively checks for each fact if it is a landmark.This check is done using relaxed planning.
lm_exhaust(reasonable_orders=false, only_causal_landmarks=false, disjunctive_landmarks=true, conjunctive_landmarks=true, no_orders=false)
reasonable_orders (bool): generate reasonable orders
only_causal_landmarks (bool): keep only causal landmarks
disjunctive_landmarks (bool): keep disjunctive landmarks
conjunctive_landmarks (bool): keep conjunctive landmarks
no_orders (bool): discard all orderings
Relevant options: reasonable_orders, only_causal_landmarks
Language features supported:
conditional_effects: ignored, i.e. not supported
h^m Landmarks
The landmark generation method introduced by Keyder, Richter & Helmert (ECAI 2010).
lm_hm(m=2, reasonable_orders=false, only_causal_landmarks=false, disjunctive_landmarks=true, conjunctive_landmarks=true, no_orders=false)
m (int): subset size (if unsure, use the default of 2)
reasonable_orders (bool): generate reasonable orders
only_causal_landmarks (bool): keep only causal landmarks
disjunctive_landmarks (bool): keep disjunctive landmarks
conjunctive_landmarks (bool): keep conjunctive landmarks
no_orders (bool): discard all orderings
Relevant options: m, reasonable_orders, conjunctive_landmarks, no_orders
Merged Landmarks
Merges the landmarks and orderings from the parameter landmarks
lm_merged(lm_factories, reasonable_orders=false, only_causal_landmarks=false, disjunctive_landmarks=true, conjunctive_landmarks=true, no_orders=false)
lm_factories (list of LandmarkFactory):
reasonable_orders (bool): generate reasonable orders
only_causal_landmarks (bool): keep only causal landmarks
disjunctive_landmarks (bool): keep disjunctive landmarks
conjunctive_landmarks (bool): keep conjunctive landmarks
no_orders (bool): discard all orderings
Precedence: Fact landmarks take precedence over disjunctive landmarks, orderings take precedence in the usual manner (gn > nat > reas > o_reas).
Relevant options: Depends on landmarks
Note: Does not currently support conjunctive landmarks
Language features supported:
conditional_effects: supported if all components support them
RHW Landmarks
The landmark generation method introduced by Richter, Helmert and Westphal (AAAI 2008).
lm_rhw(reasonable_orders=false, only_causal_landmarks=false, disjunctive_landmarks=true, conjunctive_landmarks=true, no_orders=false)
reasonable_orders (bool): generate reasonable orders
only_causal_landmarks (bool): keep only causal landmarks
disjunctive_landmarks (bool): keep disjunctive landmarks
conjunctive_landmarks (bool): keep conjunctive landmarks
no_orders (bool): discard all orderings
Relevant Options: reasonable_orders, only_causal_landmarks, disjunctive_landmarks, no_orders
Language features supported:
conditional_effects: supported
Zhu/Givan Landmarks
The landmark generation method introduced by Zhu & Givan (ICAPS 2003 Doctoral Consortium).
lm_zg(reasonable_orders=false, only_causal_landmarks=false, disjunctive_landmarks=true, conjunctive_landmarks=true, no_orders=false)
reasonable_orders (bool): generate reasonable orders
only_causal_landmarks (bool): keep only causal landmarks
disjunctive_landmarks (bool): keep disjunctive landmarks
conjunctive_landmarks (bool): keep conjunctive landmarks
no_orders (bool): discard all orderings
Relevant options: reasonable_orders, no_orders
Language features supported:
conditional_effects: We think they are supported, but this is not 100% sure.