// SAA overrides this method
// here we remove scnenarios as we use them to make sure each policy is generated using its own
// scenarios.
// so we call getIdealBids which uses m_numScenarios most recent scenarios and then remove them so
// the next call to getIdealBids gets different scenarios
public ArrayList<Bid> getBids() {
Misc.myassert(!(numPolicies == 1 && numEvaluations != 0));
ArrayList<Bid>[] policies = new ArrayList[numPolicies];
for (int i = 0; i < numPolicies; i++) {
policies[i] = getIdealBids();
repository.removeXMostRecent(numScenarios);
}
if (numPolicies == 1) return policies[0];
Misc.println("Algorithm.getBids : evaluating more than 1 policies...");
// evaluation scenarios
Priceline[] evaluationScenarios = repository.removeXMostRecent(numEvaluations);
// evaluate policies
int bestPolicy = -1;
float bestEvaluation = 0;
for (int i = 0; i < numPolicies; i++) {
float evaluation = evaluate(policies[i], evaluationScenarios);
if (bestPolicy == -1 || evaluation > bestEvaluation) {
bestPolicy = i;
bestEvaluation = evaluation;
}
}
// this is to make sure we do not generate extra scenarios.
// also see the comment at the top of the method: we need to generate enough scenarios otherwise
// we won't have enough for all policies - vn
Misc.myassert(repository.getAvailableScenarios().length == 0);
Misc.println("Algorithm.getBids : best policy = " + bestPolicy);
return policies[bestPolicy];
}
// evaluates a policy (an ArrayList of Bids)
public float evaluate(ArrayList<Bid> bids, Priceline[] evaluationScenarios) {
float ret = 0;
for (int i = 0; i < numEvaluations; i++) {
Misc.println("Algorithm.evaluate : scenario " + i);
// evaluationScenarios[i].priceline.printHotel();
float bank = 0;
float cost = 0;
TACCollection hown = new TACCollection(repository.getOwnCollection());
for (int j = 0; j < bids.size(); j++) {
Bid b = bids.get(j);
int auction = b.getAuction();
switch (Constants.auctionType(auction)) {
case Constants.TYPE_FLIGHT:
for (int k = 0; k < b.getNoBidPoints(); k++) {
// float currentPrice = m_dr.getQuote(auction).getAskPrice();
float currentPrice =
evaluationScenarios[i]
.currBuyPrice[auction]; // expected min price - lower than current price
if (b.getPrice(k) >= currentPrice) {
int q = b.getQuantity(k);
Misc.myassert(1 == q); // comment out if causes problems - vn
hown.setOwn(auction, hown.getOwn(auction) + q);
bank -= q * currentPrice;
cost += q * currentPrice;
}
}
break;
case Constants.TYPE_HOTEL:
// It can be happen if the calculation takes more than 1 minute.
// In that case, we just ignore the bid. sjlee.
// Because it is not a serious bug and it can happen frequently,
// it would be innocuous to continue this algorithm.
if (repository.isAuctionClosed(auction)) {
Misc.error(
"we are bidding on a closed hotel. a "
+ auction
+ " we own "
+ hown.getOwn(auction));
break;
// Misc.myassert(false);
}
for (int k = 0; k < b.getNoBidPoints(); k++) {
float closingPrice = evaluationScenarios[i].currBuyPrice[auction];
if (b.getPrice(k) >= closingPrice) {
int q = b.getQuantity(k);
Misc.myassert(1 == q); // comment out if causes problems - vn
hown.setOwn(auction, hown.getOwn(auction) + q);
bank -= q * closingPrice;
cost += q * closingPrice;
}
}
break;
case Constants.TYPE_EVENT:
// ignore!!
break;
}
}
TACCollection forsale = Constants.forSale();
for (int j = 0; j < Constants.AUCTION_MAX; j++) {
forsale.setOwn(j, 0);
}
Completion c =
completer.computeCompletion(
repository.getClientPrefs(), hown, forsale, evaluationScenarios[i]);
for (int a = 0; a < Constants.AUCTION_MAX; a++) {
Misc.myassert(0 == c.getBidPolicy().getQuantity(a));
Misc.myassert(0 == c.getAskPolicy().getQuantity(a));
}
bank += c.objectiveValue;
ret += bank;
}
return (ret / (float) numEvaluations);
}