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.

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.

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