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UniformChoice.java
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/* * Copyright (c) 2005, Regents of the University of California * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * * Neither the name of the University of California, Berkeley nor * the names of its contributors may be used to endorse or promote * products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. */ package blog.distrib; import java.util.*; import blog.*; import common.Util;
| CPD that takes a set of objects (an instance of the ObjectSet interface) as an argument, and defines a uniform distribution over this set. |
public class UniformChoice extends AbstractCondProbDistrib {
| Creates a UniformChoice CPD. This constructor is not used by the parser, which looks for a constructor taking a List as an argument. Instead, it's used when we create a UniformChoice CPD in the program. |
public UniformChoice() {
}
Creates a UniformChoice CPD. The CPD takes no parameters.
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public UniformChoice(List params) {
if (!params.isEmpty()) {
throw new IllegalArgumentException
("UniformChoice CPD does not take any parameters.");
}
}
Takes a single argument, namely a set S. If S is non-empty,
returns 1 / |S| if value is in S, and otherwise 0.
If S is empty, returns 1 if the value is Model.NULL, and 0
otherwise.
other than a single argument of
class ObjectSet.
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public double getProb(List args, Object value) {
ObjectSet s = processArgs(args);
//if (!s.contains(value)) {
// System.out.println("UniformChoice: " + value + " is not in " + s);
// System.out.println("Explicit version of set is: "
// + new ArrayList(s));
//}
if (s.isEmpty()) {
return (value == Model.NULL) ? 1 : 0;
}
return (s.contains(value) ? (1.0 / s.size()) : 0);
}
Takes a single argument, namely a finite set S. Returns an element
of S selected uniformly at random. If S is empty, returns Model.NULL.
other than a single argument of
class ObjectSet.
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public Object sampleVal(List args, Type childType) {
ObjectSet s = processArgs(args);
if (s.isEmpty()) {
return Model.NULL;
}
int n = Util.randInt(s.size());
return s.sample(n);
}
private ObjectSet processArgs(List args) {
if (args.size() != 1) {
throw new IllegalArgumentException
("UniformChoice CPD takes exactly one argument.");
}
if (!(args.get(0) instanceof ObjectSet)) {
throw new IllegalArgumentException
("UniformChoice CPD takes an argument of class ObjectSet, "
+ "not one of "
+ args.get(0).getClass() + ".");
}
return (ObjectSet) args.get(0);
}
}
This file was generated on Tue Jun 08 17:53:48 PDT 2010 from file UniformChoice.java
by the ilog.language.tools.Hilite Java tool written by Hassan Aït-Kaci