by Lee Spector (lspector)
There have been a couple of Clojush updates since my last post here, with the most significant being tagged-code macros for facilitating the manipulation of code within the tag space (taking arguments from the tag space and then tagging results). Details are in the update comment below.
Available as usual from: https://github.com/lspector/Clojush
20110618: - Switched to Kyle Harrington's version of overlap; it's more clear, possibly faster, and may fix a hard-to-trace bug that cropped up in a long evolutionary run (?). 20110624: - Replaced lawnmower and dsoar examples with bugfixed versions (thanks to Kyle Harrington). - Added namespace and made miscellaneous other changes to clojush-tests.clj. - Added support for tagged-code macros. Tagged-code macro calls have the effect of code instructions, but they take their code arguments from the tag space and they tag their code return values. They are implemented as macros to leverage the existing code instruction set; note that this means that a single call will contribute more than one iteration step toward the evalpush-limit. Tagged-code macros appear in programs as hash maps that map :tagged_code_macro to true, :instruction to a code instruction, :argument_tags to a sequence of tags to be used to acquire arguments, and :result_tags to a sequence of tags to be used for tagging results. Execution of a macro expands the needed code onto the exec stack to grab arguments from the tag space and push them on the code stack, execute the code instruction, and tag results. Note that results will also be left on the code stack if global-pop-when-tagging is false. Conceptually, tag values are "baked in" to these macros in much the same way that tag values are "baked in" to the instruction names for stackless tag instructions; we use hash maps simply because there is more information to bake in and this prevents us from having to parse the names (which would get messy and also waste time). Because the maps make it difficult to read programs, however, a utility function called abbreviate-tagged-code-macros is provided to produce copies of programs with more human-readable (but not currently executable) representations of tagged-macro calls. A tagged-code-macro-erc is provided to generate random tagged-code macros in pushgp runs. A new example, codesize20, provides a simple demonstration of the use of tagged-code macros.