Track backtracking in Explicit Stack Search. #57
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rpgoldman
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Keep backtrack count in new special variable `*backtracks*`, and add it to `print-stats`. Fix format string typo. Remove a debug print that was left in. Redirect output from ESS to OUT-STREAM. Previously, output redirection was not propagated from `find-plans-stack` to `seek-plans-stack`.
Any time `seek-plans-stack` is called, it must be done in a context where a large number of special variables for counting (for assessing performance) are bound. Establish `bind-count-variables` macro for this purpose. Note that it is the *caller's* job to handle this -- it's already done by `find-plans-stack`, but any new call direct to `seek-plans-stack` will need to be wrapped.
Multiple minor clean-ups and optimizations spurred by SBCL compiler notes. Theorem-prover cleanup.
Incorrect multi-problem approach. Fix handling of logistics problems. Other domains have 1 problem per file, but logistics has multple problems per file, so this run script was not working properly.
Now applies to symbols (it's just an identity function there). This allows the programmer to work with problem names and problems interchangeably.
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Instead of tracking each backtrack point, track only the point at which backtracking commenced, and then stop counting backtrack types until after we resume forward motion. So this means we will have a large number of backtrack counts, but a smaller number of counts of places where backtracking starts.
For whatever reason, pfile3 cannot be solved. (There's clearly some bug, probably in the domain design, because it fails instead of going away forever.) Also, when fixing that, made this more robust by using `asdf:system-relative-pathname`, instead of hard-coded pathname.
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In order to identify opportunities for improving plan repair and developing analogical replay, collect statistics about backtracking.