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130 lines
4.9 KiB
Common Lisp
130 lines
4.9 KiB
Common Lisp
;;; -*- Mode: Lisp; Syntax: Common-Lisp; Package: snark-user -*-
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;;; File: hot-drink-example.lisp
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;;; The contents of this file are subject to the Mozilla Public License
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;;; Version 1.1 (the "License"); you may not use this file except in
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;;; compliance with the License. You may obtain a copy of the License at
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;;; http://www.mozilla.org/MPL/
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;;;
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;;; Software distributed under the License is distributed on an "AS IS"
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;;; basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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;;; License for the specific language governing rights and limitations
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;;; under the License.
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;;;
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;;; The Original Code is SNARK.
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;;; The Initial Developer of the Original Code is SRI International.
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;;; Portions created by the Initial Developer are Copyright (C) 1981-2005.
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;;; All Rights Reserved.
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;;;
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;;; Contributor(s): Mark E. Stickel <stickel@ai.sri.com>.
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(in-package :snark-user)
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;;; this is a simple example of one way of implementing partitions in SNARK
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;;; rows are annotated with the partitions they're in and inferences are
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;;; restricted to rows in the same partitions
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;;;
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;;; a partition communication table is used to augment the annotation
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;;; of derived rows in case the row should be included in a neighboring
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;;; partition too
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;;;
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;;; the partition communication table computation is invoked by including
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;;; it as a pruning test
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;;;
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;;; this code is more illustrative than definitive
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;;; partition communication table is a set of triples
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;;; (from-partition to-partition relation-names) like
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;;; (1 2 (water))
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;;; (2 3 (steam))
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(defun row-predicate-names (row)
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(row-relation-names row))
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(defun row-relation-names (row)
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;; returns list of relation names in formula part
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;; (but not answer, constraint, etc. parts) of a row
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(let ((names nil))
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(prog->
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(snark::map-atoms-in-wff (row-wff row) ->* atom polarity)
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(declare (ignore polarity))
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(dereference
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atom nil
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:if-constant (pushnew (constant-name atom) names)
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:if-compound (pushnew (function-name (head atom)) names)))
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names))
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(defun partition-communication (row)
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;; could try to refine the context for added partitions
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(when (use-partitions?)
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(let ((table (partition-communication-table?))
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(preds (row-relation-names row))
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(context (snark::row-context row))
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(more-context nil))
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(flet ((message-passing-from (x)
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(prog->
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(car x -> part1)
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(sparse-matrix-row table part1 ->nonnil row)
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(cdr x -> ctxt1)
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(map-sparse-vector-with-indexes row ->* preds2 part2)
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(when (and (null (assoc part2 context))
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(null (assoc part2 more-context))
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(subsetp preds preds2))
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(push (cons part2 ctxt1) more-context)
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nil))))
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(mapc #'message-passing-from context)
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(do ()
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((null more-context))
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(push (pop more-context) context)
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(message-passing-from (first context)))
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(setf (snark::row-context row) context))))
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nil)
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(defun hot-drink-example (&key (use-partitions t) (use-ordering nil))
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;; Amir & McIlraith partition-based reasoning example
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(initialize)
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(when use-partitions
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(use-partitions '(1 2 3))
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(partition-communication-table
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(let ((pct (make-sparse-matrix)))
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(setf (sparef pct 1 2) '(water)
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(sparef pct 2 3) '(steam))
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pct))
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(pruning-tests (append (pruning-tests?) '(partition-communication))))
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(cond
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(use-ordering
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(use-resolution t)
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(use-literal-ordering-with-resolution 'literal-ordering-a)
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(declare-proposition 'ok_pump)
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(declare-proposition 'on_pump)
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(declare-proposition 'man_fill)
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(declare-proposition 'water)
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(declare-proposition 'ok_boiler)
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(declare-proposition 'on_boiler)
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(declare-proposition 'steam)
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(declare-proposition 'coffee)
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(declare-proposition 'hot_drink)
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(declare-ordering-greaterp '(ok_pump on_pump man_fill) 'water)
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(declare-ordering-greaterp '(water ok_boiler on_boiler) 'steam)
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(declare-ordering-greaterp 'coffee 'hot_drink))
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(t
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(use-hyperresolution t)))
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(dolist (wff '((or (not ok_pump) (not on_pump) water)
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(or (not man_fill) water)
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(or (not man_fill) (not on_pump))
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(or man_fill on_pump)))
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(assert wff :partitions '(1)))
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(dolist (wff '((or (not water) (not ok_boiler) (not on_boiler) steam)
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(or water (not steam))
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(or ok_boiler (not steam))
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(or on_boiler (not steam))))
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(assert wff :partitions '(2)))
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(dolist (wff '((or (not steam) (not coffee) hot_drink)
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(or coffee teabag)
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(or (not steam) (not teabag) hot_drink)))
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(assert wff :partitions '(3)))
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(assume 'ok_pump :partitions '(1))
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(assume 'ok_boiler :partitions '(2))
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(assume 'on_boiler :partitions '(2))
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(closure))
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;;; hot-drink-example.lisp EOF
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