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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: | For mostly historical reasons, specifying the cost type (see [[Doc/Heuristic]]) for landmark heuristics ({{{lmcount}}}, see [[Doc/Heuristic#Landmark-count_heuristic]]) is currently complicated. Here's the complete set of rules: |
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| === If you use the LAMA-FF synergy === | There are two relevant options: |
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| There are three relevant options: | 1. {{{lm_cost_type}}} of the landmark generation method (currently only used by {{{lm_rhw}}}) 2. {{{transform}}} of the landmark heuristic declaration ({{{lmcount}}}). Pass e.g. {{{transform=adapt_costs(one)}}} for unit costs. |
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| 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 landmark heuristic is determined by option 1. when using {{{admissible=false}}} and by option 2. when using {{{admissible=true}}}. |
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| 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}}}. | '''Note:''' Setting the cost type for the LAMA-FF synergy's master (see [[Doc/Heuristic#LAMA-FF_synergy_master]]) follows the same rules as the landmark heuristic. The cost type of the synergy's FF heuristic is determined by option 2. |
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| The cost type of the synergy's FF heuristic is determined by option 2. /!\ | == Using "preferred operators" with landmark heuristics == |
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| === If you do not use the LAMA-FF synergy === | Unlike all other (current) heuristics, the landmark heuristic ({{{lmcount}}}, see [[Doc/Heuristic#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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| 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/Heuristic| 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.
Setting the "cost type" for landmark heuristics
For mostly historical reasons, specifying the cost type (see Doc/Heuristic) for landmark heuristics (lmcount, see Doc/Heuristic#Landmark-count_heuristic) is currently complicated. Here's the complete set of rules:
There are two relevant options:
lm_cost_type of the landmark generation method (currently only used by lm_rhw)
transform of the landmark heuristic declaration (lmcount). Pass e.g. transform=adapt_costs(one) for unit costs.
The cost type of the landmark heuristic is determined by option 1. when using admissible=false and by option 2. when using admissible=true.
Note: Setting the cost type for the LAMA-FF synergy's master (see Doc/Heuristic#LAMA-FF_synergy_master) follows the same rules as the landmark heuristic. The cost type of the synergy's FF heuristic is determined by option 2.
Using "preferred operators" with landmark heuristics
Unlike all other (current) heuristics, the landmark heuristic (lmcount, see Doc/Heuristic#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.