Changes between Version 502 and Version 503 of WikiStart

Timestamp:

12/16/24 13:25:15 (4 months ago)

Author:

wouter

Comment:

--

WikiStart

@@ -236 +236 @@
 === Sum Of Groups
 The SumOfGroupsUtilitySpace 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. All combinations must have a utility assigned.
+utilities of a number of subsets, or groups, of the issue values. 
 
 This space enables handling UtilitySpaces that are not simply linear
@@ -250 +247 @@
 
 
+Let's look at more detail at the computerbuy.json profile: 
+{{{
+"SumOfGroupsUtilitySpace": {
+        "domain": {....
+        },
+        "name": "computerbuy",
+        "partUtilities": {
+                "boxandgraphics": {
+                        "PartsUtilities": {
+                                "issues": [
+                                        "box",
+                                        "graphics"
+                                ],
+                                "utilslist": [
+                                        {
+                                                "values": [
+                                                        "all-in-one",
+                                                        "built-in"
+                                                ],
+                                                "util": 0.09
+                                        },
+                                        {
+                                                "values": [
+                                                        "all-in-one",
+                                                        "low 8G"
+                                                ],
+                                                "util": 0
+                                        },
+....
+}}}
+
+The domain is a normal domain definition, with a number of issues and possible issue values.
+
+The different part is the partsUtilities. Here utilities are defined on combinations of
+issue values, instead of per issue. The first group is named "boxandgraphics" (any name can be chosen), 
+combining the values of the issue "box" and "graphics".  Here we see that the utility of a all-in-one with built-in graphics is higher than that of a all-in-one with a low-end graphics card, and that infact the latter has utility 0 (which is because the all-in-one box does not have a graphics card slot).