Changes between Version 364 and Version 365 of WikiStart

Timestamp:

10/07/20 16:52:25 (4 years ago)

Author:

wouter

Comment:

--

WikiStart

@@ -126 +126 @@
  * [source:profile/src/main/java/geniusweb/profile/PartialOrdering.java PartialOrdering]: as {{{FullyOrderedSpace}}}, but may not know the answer for part of the bids
  * [source:profile/src/main/java/geniusweb/profile/utilityspace/UtilitySpace.java UtilitySpace]: as {{{FullOrdering}}}, but additionally this provides a function {{{getUtility(bid)}}} that maps the bid into a {{{BigDecimal}}} in [0,1]. The higher the value, the more preferred is that bid. The [source:profile/src/main/java/geniusweb/profile/utilityspace/LinearAdditiveUtilitySpace.java Linear Additive Space] is the most commonly used UtilitySpace. If the accuracy of {{{BigDecimal}}} is not needed, you can just call {{{BigDecimal#doubleValue()}}} to get a standard double. 
+ * The SumOfGroupsUtilitySpace is a utilityspace where the utilities are not simply linear-additive. It defines the utility of bids as a sum of the utilities of a number of subsets, or groups, of the issue values.
 
 === Linear Additive
@@ -196 +197 @@
 * domain: identical to above. We replaced some issueValues with "..." in this example . 
 * name: a simple string with the name of the profile. The name must match the filename of the profile.
+
+=== Sum Of Groups
+This is a utility space that defines the utility of bids as a sum of the
+utilities of a number of subsets, or groups, of the issue values.
+
+A group defines the utility of a non-empty subset of the issues in the domain. 
+The parts are non-overlapping. Missing issue values have utility 0.
+
+This space enables handling UtilitySpaces that are not simply linear
+additive, but with interacting issue values. For example, if you would like
+to have a car with good speakers but only if there is also a good hifi set,
+you can make a part that has {@link PartsUtilities} like
+{{{
+{ { speakers:yes, hifi:yes }:1, {speakers, no: hifh:yes}:0.2, ...}
+}}}
+
+
+
 
 === Partial Ordered