source: src/main/java/agents/ai2014/group12/Preference.java@ 127

Last change on this file since 127 was 1, checked in by Wouter Pasman, 6 years ago

Initial import : Genius 9.0.0
File size: 8.1 KB
Line 
1package agents.ai2014.group12;
2
3import java.util.ArrayList;
4import java.util.HashMap;
5import java.util.List;
6import java.util.Map;
7
8import genius.core.Bid;
9import genius.core.Domain;
10import genius.core.issue.IssueDiscrete;
11import genius.core.issue.Objective;
12import genius.core.issue.Value;
13import genius.core.issue.ValueDiscrete;
14import genius.core.utility.AdditiveUtilitySpace;
15import genius.core.utility.Evaluator;
16import genius.core.utility.EvaluatorDiscrete;
17
18/**
19 * The Preference class will hold the issues, their weights and for each issue
20 * their values and the order of these values. Only compatible with
21 * {@link AdditiveUtilitySpace}.
22 *
23 */
24public class Preference {
25 ArrayList<PreferenceBlock> preferenceList = new ArrayList<PreferenceBlock>();
26
27 /**
28 * First constructor for the Preference class, this is to create a
29 * Preference profile for the agent that is currently in turn. This
30 * Preference object will not be updated. The Utilityspace is used to fill
31 * the values of each issue and their order.
32 *
33 * @param utilitySpace
34 * of the player in turn
35 */
36 public Preference(AdditiveUtilitySpace utilitySpace) {
37 Domain domain = utilitySpace.getDomain();
38 int size = utilitySpace.getEvaluators().size();
39 System.out.println("size: " + size);
40 List<Objective> objectives = domain.getObjectives();
41 for (int i = 1; i <= size; i++) {
42 IssueDiscrete issue = (IssueDiscrete) objectives.get(i);
43 Double weight = utilitySpace.getWeight(i);
44 Evaluator evalor = utilitySpace.getEvaluator(i);
45 EvaluatorDiscrete evalorDis = (EvaluatorDiscrete) evalor;
46 // Define each issue with every weight attached
47 PreferenceBlock prefBlock = new PreferenceBlock(evalorDis,
48 issue.getName(), weight);
49 prefBlock.normalizeNodeValues();
50 Node highest = prefBlock.getHighestPreference();
51 highest.setFlag(true);
52 preferenceList.add(prefBlock);
53 }
54 // Possibility to randomize the other values of each issue.
55 }
56
57 /**
58 * This constructor is used to create a Preference object for an Agent of
59 * which you have received a bid for the first time. The utilitySpace of the
60 * agent receiving the message will be used for the initial issue, value and
61 * order setup. This will be later updated using the bids of the agent to
62 * which this preference belongs to.
63 *
64 * @param utilitySpace
65 * of the agent receiving the message
66 * @param bid
67 */
68 public Preference(AdditiveUtilitySpace utilitySpace, Bid bid) {
69 Domain domain = utilitySpace.getDomain();
70 int size = utilitySpace.getEvaluators().size();
71 System.out.println("size: " + size);
72 List<Objective> objectives = domain.getObjectives();
73 for (int i = 1; i <= size; i++) {
74 IssueDiscrete issue = (IssueDiscrete) objectives.get(i);
75 double weight = 1.0 / size;
76 Evaluator evalor = utilitySpace.getEvaluator(i);
77 System.out.println(evalor);
78 EvaluatorDiscrete evalorDis = (EvaluatorDiscrete) evalor;
79 // Define an issue with all weights the same
80 PreferenceBlock prefBlock = new PreferenceBlock(evalorDis,
81 issue.getName(), weight);
82 prefBlock.normalizeNodeValues();
83 Node highest = prefBlock.getHighestPreference();
84 highest.setFlag(true);
85 preferenceList.add(prefBlock);
86 }
87 setHighestIssuePreference(bid);
88 // Possibility to randomize the other values of each issue.
89 }
90
91 /**
92 * Updates the preference of a party given the current bid. It considers the
93 * first bid to be the agents highest utility bid. It will not take into
94 * account the nodes flagged value for this first bid.
95 *
96 * @param bid
97 */
98 public void setHighestIssuePreference(Bid bid) {
99 HashMap<Integer, Value> values = bid.getValues();
100 for (int i = 1; i <= values.size(); i++) {
101 ValueDiscrete value = (ValueDiscrete) values.get(i);
102 PreferenceBlock preferBlock = preferenceList.get(i - 1);
103 Node currentHighest = preferBlock.getHighestPreference();
104 if (!currentHighest.getName().equals(value.getValue())) {
105 // preferBlock.orderNodesLowToHigh();
106 ArrayList<Node> nodes = preferBlock.nodeList;
107
108 int index = preferBlock.indexOf(value.getValue());
109
110 for (int j = index; j < nodes.size() - 1; j++) {
111 nodes.get(j).setName(nodes.get(j + 1).getName());
112 }
113 nodes.get(nodes.size() - 1).setName(value.getValue());
114 }
115 }
116 }
117
118 /**
119 * This method updates the preference order of an already initialized
120 * preference object This will used the flagged status to determine what
121 * nodes have alreay been set. It will determine what values have been
122 * changed and were not yet flagged and will set those in the appropriate
123 * order and update their flagged status.
124 *
125 * @param bid
126 */
127 public void updatePreferenceOrder(Bid bid) {
128 // First update the sequence of the values of an issue
129 HashMap<Integer, Value> values = bid.getValues();
130 for (int i = 1; i <= values.size(); i++) {
131 ValueDiscrete value = (ValueDiscrete) values.get(i);
132 PreferenceBlock preferBlock = preferenceList.get(i - 1);
133 ArrayList<Node> nodesWithoutFlag = preferBlock
134 .getValuesWithoutFlag();
135 for (int j = 0; i < nodesWithoutFlag.size(); i++) {
136 // If not flagged yet, flag it and set it to the next value
137 // after the last flagged
138 if (nodesWithoutFlag.get(i).getName().equals(value.getValue())) {
139 int highestIndexWithoutFlag = preferBlock
140 .getHighestIndexWithoutFlag();
141
142 ArrayList<Node> nodes = preferBlock.nodeList;
143 int index = preferBlock.indexOf(value.getValue());
144
145 for (int k = index; k < nodes.size() - 1
146 && !nodes.get(k + 1).getFlag(); k++) {
147 nodes.get(k).setName(nodes.get(k + 1).getName());
148 }
149 nodes.get(highestIndexWithoutFlag)
150 .setName(value.getValue());
151 nodes.get(highestIndexWithoutFlag).setFlag(true);
152 }
153 }
154 }
155 }
156
157 /**
158 * This method updates the issue weights given the previous bid and the new
159 * bid. Each weight of an issue that has been changed will be decreased and
160 * then normalized.
161 *
162 * @param previousBids
163 * @param newBid
164 */
165 public void updateIssueWeights(ArrayList<Bid> previousBids, Bid newBid) {
166 Bid previousBid = previousBids.get(previousBids.size() - 1);
167 ArrayList<Integer> changedIssues = getChangedIndices(previousBid,
168 newBid);
169
170 // Decrease the weights that have been changed
171 for (int i = 0; i < changedIssues.size(); i++) {
172 preferenceList.get(changedIssues.get(i)).weight -= 0.50 / changedIssues
173 .size();
174 }
175
176 // Sum the weights
177 double sum = 0.0;
178 for (int i = 0; i < preferenceList.size(); i++) {
179 sum += preferenceList.get(i).weight;
180 }
181 // Normalize the weights
182 for (int i = 0; i < preferenceList.size(); i++) {
183 preferenceList.get(i).weight = preferenceList.get(i).weight / sum;
184 }
185 }
186
187 /**
188 * Method that returns the changed indices by comparing the previous bid and
189 * the new bid
190 *
191 * @param previousBid
192 * @param newBid
193 * @return list of integers with the changed indices
194 */
195 public ArrayList<Integer> getChangedIndices(Bid previousBid, Bid newBid) {
196 ArrayList<Integer> indices = new ArrayList<Integer>();
197 HashMap<Integer, Value> valuesNewBid = newBid.getValues();
198 HashMap<Integer, Value> valuesPreviousBid = previousBid.getValues();
199 for (int i = 1; i <= valuesNewBid.size(); i++) {
200 ValueDiscrete valueNewBid = (ValueDiscrete) valuesNewBid.get(i);
201 ValueDiscrete valuePreviousBid = (ValueDiscrete) valuesPreviousBid
202 .get(i);
203 if (!valueNewBid.getValue().equals(valuePreviousBid.getValue())) {
204 // i-1 to get the right index in the preferenceList
205 indices.add(i - 1);
206 }
207 }
208 return indices;
209 }
210
211 /**
212 * Calculates the utility value for a bid given the current preference
213 * profile. This gives the agent the possibility to calculate other agents
214 * utilities without knowing their exact preference profile.
215 *
216 * @param bid
217 * @return double
218 */
219 public double getUtilityValue(Bid bid) {
220 HashMap<Integer, Value> bidvalues = bid.getValues();
221 double returnUtility = 0;
222 for (PreferenceBlock block : preferenceList) {
223 double weight = block.weight;
224 for (Map.Entry<Integer, Value> entry : bidvalues.entrySet()) {
225 Value value = entry.getValue();
226 for (Node node : block.nodeList) {
227 if (node.getName() == value.toString()) {
228 returnUtility += node.getValue() * weight;
229 }
230 }
231 }
232 }
233 return returnUtility;
234 }
235}
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