|
Size: 1517
Comment:
|
Size: 738
Comment: lm_cost_type was removed in issue776
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 7: | Line 7: |
| == Setting the "cost type" for landmark heuristics == | == Using "preferred operators" with landmark heuristics == |
| Line 9: | Line 9: |
| For mostly historical reasons, specifying the cost type (see [[Doc/Heuristic]]) 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: |
| Line 11: | Line 11: |
| There are two 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. 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 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 the lmcount heuristic == Unlike all other (current) heuristics, the {{{lmcount}}} 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: 1. Set {{{pref=true}}} in the [[Doc/Heuristic| heuristic specification]]. |
1. Set {{{pref=true}}} in the [[Doc/Evaluator| heuristic specification]]. |
Back to the HomePage.
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.