1 | from ..Constants import Constants
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2 |
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3 |
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4 | class OpponentModel:
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5 | def __init__(self, domain):
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6 | self._domain = domain
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7 | self._freqs = {}
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8 | for issue in self._domain.getIssues():
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9 | self._freqs[issue] = {}
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10 |
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11 | # Update value frequency for new incoming bid
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12 | def update_frequencies(self, bid):
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13 | if bid is not None:
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14 | for issue in self._domain.getIssues():
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15 | value = bid.getValue(issue)
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16 | if value in self._freqs[issue]:
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17 | self._freqs[issue][value] += 1
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18 | else:
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19 | self._freqs[issue][value] = 1
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20 |
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21 | # returns normalized weights depending on importance of the issues
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22 | # along with the largest value freq for each issue
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23 | def _issue_weights(self):
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24 | # For each issue we find the highest frequency
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25 | max_freqs = {}
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26 | max_f = 0
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27 | for issue in self._domain.getIssues():
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28 | max_freqs[issue] = 0
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29 | for value in self._freqs[issue]:
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30 | if max_freqs[issue] < self._freqs[issue][value]:
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31 | max_freqs[issue] = self._freqs[issue][value]
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32 | if max_f < max_freqs[issue]:
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33 | max_f = max_freqs[issue]
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34 | weights = {}
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35 | # normalize weights
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36 | for issue in self._domain.getIssues():
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37 | weights[issue] = max_freqs[issue] / max_f if max_f != 0 else 0
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38 | return weights, max_freqs
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39 |
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40 | # returns the utility of our bid to opponent
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41 | def utility(self, bid):
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42 | u = 0
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43 | weights, max_freqs = self._issue_weights()
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44 | # utility is the sum of normalized value freq * issue weight
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45 | for issue in self._domain.getIssues():
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46 | value = bid.getValue(issue)
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47 | if value in self._freqs[issue]:
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48 | u += (self._freqs[issue][bid.getValue(issue)] / max_freqs[issue]) * weights[issue]
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49 |
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50 | u /= len(self._domain.getIssues())
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51 |
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52 | return u * Constants.opponent_model_offset
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