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| == Setting the "cost type" for landmark heuristics == | == Using "preferred operators" with landmark heuristics == |
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| For mostly historical reasons, specifying the cost type (see HeuristicSpecification) for landmark heuristics is currently complicated. Here's the complete set of rules: | Unlike all other (current) heuristics, the landmark heuristic ({{{lmcount}}}, see [[Doc/Evaluator#Landmark-count_heuristic]]) requires a special setting {{{pref=true}}} to enable preferred operator support. Hence, to use preferred operators with that heuristic, '''two''' things must be done at the moment: |
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| === If you use the LAMA-FF synergy === There are three relevant options: 1. {{{lm_cost_type}}} of the landmark generation method (e.g. {{{lm_rhw}}}) 2. {{{cost_type}}} of the landmark generation method (e.g. {{{lm_rhw}}}) 3. {{{cost_type}}} of the synergy declation ({{{lm_ff_syn}}}) The cost type of the synergy's landmark heuristic is determined by option 1. when using {{{admissible=false}}} and by option 3. when using {{{admissible=true}}}. The cost type of the synergy's FF heuristic is determined by option 2. /!\ === If you do not use the LAMA-FF synergy === There are three relevant options: 1. {{{lm_cost_type}}} of the landmark generation method (e.g. {{{lm_rhw}}}) 2. {{{cost_type}}} of the landmark generation method (e.g. {{{lm_rhw}}}) 3. {{{cost_type}}} of the landmark heuristic declation ({{{lmcount}}}) The cost type of the landmark heuristic is determined by option 1. when using {{{admissible=false}}} and by option 3. when using {{{admissible=true}}}. Option 2 is ignored in this case. |
1. Set {{{pref=true}}} in the [[Doc/Evaluator| heuristic specification]]. 2. Include the heuristic in the list of heuristics in the {{{preferred}}} specification of the [[Doc/SearchEngine|search engine]]. |
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Caveats for the options
Here, we document some aspects of the command-line syntax that may be unintuitive or complicated.
Using "preferred operators" with landmark heuristics
Unlike all other (current) heuristics, the landmark heuristic (lmcount, see Doc/Evaluator#Landmark-count_heuristic) requires a special setting pref=true to enable preferred operator support. Hence, to use preferred operators with that heuristic, two things must be done at the moment:
Set pref=true in the heuristic specification.
Include the heuristic in the list of heuristics in the preferred specification of the search engine.