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| Back to [[Doc/Heuristic]]. = LP solver support = Some configurations of the search component of Fast Downward, such as optimal cost partitioning for landmark heuristics, require an Linear Programming (LP) solver and will complain if the planner has not been built with support for such a solver. Fast Downward uses the [[http://www.coin-or.org/|COIN-OR]] LP Solver ([[http://www.coin-or.org/Clp/|CLP]]) with the [[https://projects.coin-or.org/Osi|Open Solver Interface]]. == Instructions for building Fast Downward with LP support == To enable LP support in Fast Downward, change the line {{{ USE_LP=0 }}} in the {{{Makefile}}} to {{{ USE_LP=1 }}} and run {{{ make clean make }}} The {{{make}}} invocation will take a long time because it first builds the LP library, which is rather big. This is a one-time operation: once the library has been built, it will not be deleted, not even by {{{make clean}}} or {{{make distclean}}}. If for some reason you absolutely want to delete it, run {{{rm -r lp/coin}}} and it will be rebuilt on the next compile with {{{USE_LP=1}}}. == If LP setup fails == The LP solver has a number of dependencies which might not be installed on your system. If for some reason the LP setup step fails, we'd appreciate if you attempt to troubleshoot it yourself. Check the contents of the {{{setup}}} script in the {{{lp}}} directory to see what it does, try to run the various steps manually, have a look at the errors generated, and consult the Osi documentation. If after troubleshooting you can get the LP package to work, do let us know of your problem and its solution so that we can improve these instructions. If you still cannot get it to work, we may be able to provide some help, but note that the LP solver is an external package not developed by us. |