-*- mode:Text -*-
Copyright 1992 Patrick H. Winston.  All rights reserved.
Version 1.1, transferred from master disk on 21 Jan 93
 
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PURPOSE

Provides program support for Chapter 20, Learning by Managing
Multiple Models.  Illustrates version space learning using
allergies.

PERFORMANCE EXPERIMENT 1

Examine the file version.exp.  Run the version-space learning
experiment by typing the following command to your lisp system:

(load "version.exp")

Alternatively, evaluate each Lisp expression in the file one at a
time, noting what each does.

PERFORMANCE EXPERIMENT 2

Change the result by editing allergy.lsp, making one of the
samples both as a positive sample and as a negative sample.  Run
the version-space learning experiment again with your altered
samples.

KNOWLEDGE ENGINEERING EXPERIMENT

Try the version-space learning experiment on a database of
positive and negative samples describing your subjects, some of
which you enjoyed.  Determine if those that you enjoyed can be
characterized by some combination of the properties you have used
in your descriptions.

MEDIUM-SCALE LISP PROJECT

As it stands, the version-space learning program can only
generalize by replacing a class name by a question mark, and it
can only specialize by replacing a question mark by a class name.
Improve the program by enabling it to handle class hierarchies.
In particular, generalization should make use of all classes
one-step up the hierarchy from the present class, and
specialization should make use of all classes one-step down.