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Welcome to SHOP2, 2.9.0 This release represents a first attempt to seriously address portability for SHOP2. In particular, with this release we restructured the tests using the FiveAM library, which supports more lisp implementations than SIFT's NST testing library. We have tested SHOP2 on Allegro Common Lisp, Steel Bank Common Lisp (SBCL), Clozure Common Lisp, and GNU clisp. We do not recommend the use of clisp with SHOP2, although we are certainly interested in supporting it, and would be happy to accept patches and fixes. In particular, more difficult planning problems can cause stack exhaustion. On all but clisp, compilation with (DECLAIM (OPTIMIZE (SPEED 3) (SPACE 3))) avoids this problem. On clisp, some tests fail with stack exhaustion errors. Also, on clisp, unlike the other lisps, a stack exhaustion error is *not* a Common Lisp condition, and cannot be successfully handled (or even aborted from). If you must run with GNU clisp, please use the ANSI-compliance option. If you need a free Common Lisp implementation, we urge you to use SBCL or Clozure Common Lisp instead. We have not had the time to test on other Common Lisps, such as ECL, ABCL, or CMU CL. We suspect SHOP2 would work poorly on ABCL, because of the JVM's restrictions on tail call optimization. We would welcome any test results or reports of experience with as-yet-unsupported CL implementations. Testing SHOP2 requires three ancillary libraries: + FiveAM test library + Arnesi utility library, required for building FiveAM + FiveAM ASDF tester library, which makes ASDF:TEST-SYSTEM on SHOP2 invoke the FiveAM tests correctly. We make these libraries available in separate tarballs for the interested user. Please report any test problems. Previous entries in the README/Changelog are retained below. --- This is a release candidate for SHOP2 (lisp version), version 2. This version inaugurates a gradual shift in the architecture of SHOP2, and introduces support for PDDL domain descriptions. Both of these are in early stages. We have also separated out SHOP's theorem-prover and SHOP's unification algorithm as subsystems. There are also a small number of bugfixes. Previous versions of SHOP2 were essentially written in pre-CLOS (the Common Lisp Object System) Common Lisp. This has caused problems for developers wishing to add new capabilities (such as temporal planning, planning in nondeterministic domains, etc.) to the core SHOP algorithms. Those new capabilities had to be added in the form of redefinitions of core SHOP2 functions, generally by simply copying the entire shop2 body of code and modifying it. This practice created (at least) two problems: 1. If bugs were fixed on the main branch of SHOP2, the fixes were difficult to move into alternate versions; 2. It was very difficult to merge together these augmented versions of SHOP. For example, if one had a temporal version of SHOP, and a nondeterministic version of SHOP, there was no obvious path forward to a nondeterministic, temporal version of SHOP. We are gradually moving to make SHOP a thoroughly object-oriented system, so that behavior tailoring can be done by simply providing new methods for existing generic functions. We have been cautious in doing so, for now, so that the main path to specializing SHOP behavior is to define a subclass of the DOMAIN class, and provide new generic method definitions dispatching on this class. Elnatan Reisner has also rewritten the existing SHOP state code --- which provided alternative state representations --- to use CLOS method dispatch; previously the equivalent of method dispatch was hand-coded. This will allow extension of the state representations, as well (but note that states are implemented as structures, rather than CLOS objects, for greater efficiency). We expect to provide CLOS-based encapsulation of planner settings and planner state as we move forward. We have added rudimentary support for PDDL domain definitions in the PDDL-DOMAIN subclass of DOMAIN. This support is documented in the manual supplied with this release. We have also created two sub-systems of SHOP, the SHOP theorem-prover and the SHOP unifier, each in its own package. Doing so provides two advantages: 1. SHOP is a very large program, and separating out these subsystems provides a more understandable API for these major components, as well as helping to avoid problems of namespace clutter. 2. These two core components may be separately useful. We have successfully used SHOP's theorem-prover in different state-based applications. We hope that you enjoy using SHOP2. Please report any bugs you find using the Sourceforge bugtracking database. Robert P. Goldman, SIFT, LLC Dana Nau, University of Maryland Ugur Kuter, University of Maryland Release notes from the previous release: This is primarily a bugfix release to follow on to SHOP2 1.2. We expect that this will be the last release in SHOP2 1.x, aside from bugfixes, and that further effort will move to a new version 2.x that will have a substantially new architecture to better support modular, object-oriented extensions to SHOP2 and integrating SHOP2 into larger applications. There are two substantial changes from SHOP2 1.2 to 1.3: 1. The new default loading method is to use the ASDF (Another System Definition Facility) system loader. Those unfamiliar with ASDF can see the web page http://www.cliki.net/asdf for more details. However, it is very likely that if you have a modern Common Lisp implementation, ASDF is already distributed with your common lisp. A good first test in loading SHOP2 is to do the following: a. make a symbolic link from your asdf system definition file (this will be system dependent) to shop2.asd. Do NOT copy the file; link it. If you don't know where this is, you can try starting up your lisp implementation and doing the following: (require :asdf) [if this fails, you need to install asdf, see the above website] asdf:*central-registry* [this should print a list of directories to hold asd links.] b. start your lisp compiler c. (require :asdf) --- if this doesn't work, obtain and install a copy of asdf, using the above web site. d. (asdf:oos 'asdf:load-op :shop2) If you are lucky (users of up-to-date ACL and SBCL may expect to be lucky), this will Just Work. 2. There is now an extensive regression test suite for SHOP2. To run the regression test suite, you may type: (asdf:oos 'asdf:test-op :shop2) WARNING: this may take a couple of days to finish! This runs all the domain descriptions distributed with SHOP2, and checks the results against saved plans. We would be particularly interested in getting bug reports (or, better yet, patches!) from people who have tried to use SHOP2 with lisps other than Allegro and SBCL and on platforms other than Linux. We would also be interested in hearing from people who have run the regression test suite. This distribution contains the following files: shop2.lisp The SHOP2 program; at the top of the program file is the SHOP2 license state-utils.lisp Additional source code for SHOP2. A first step in decomposing SHOP2 into mutliple files. shop2-<foo>.pdf The SHOP2 documentation (in Adobe Acrobat format) shop2-<foo>.doc The SHOP2 documentation (in MS Word format) install.lisp This script compiles shop2.lisp into a form that both loads and runs faster. It uses a function called "compile-file", which is available in Allegro Lisp 6.0. This file is largely obsolete now. You should probably be using ASDF to laod the system instead. shop2.asd ASDF system definition for SHOP2 system. This is now the preferred means of loading shop2. Other methods will soon be deleted unless someone else is interested in maintaining them. shop2.system MK-DEFSYSTEM system definition for SHOP2. This definition is less obsolete than INSTALL.LISP, but is also falling into bit rot and will no longer be maintained unless someone volunteers. ji4shop2/ The Java interface for SHOP2. examples/ Example domains in seperate subdirectores: depots/ The Depots domain from the third international planning competition (at AIPS-2002) UMT2/ The UM Translog 2 domain from the third international planning competition. toy/ Some very simple toy examples logistics/ A simple logistics planning domain blocks/ A relatively sophisticated encoding of the traditional blocks-world planning domain See documentation files (e.g., README.txt) in the example directories for more information about those examples. IPC-2000/ The logistics domain in the second international planning competition (at AIPS-2000). This directory contains the solution validator provided in the third International Planning Competition at AIPS-2002. [This directory should probably have been placed in the examples.]
Source: README.txt, updated 2012-09-10

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