一種求解組合拍賣勝者決定問題的局部搜索算法
[Abstract]:An auction is a form of bidding. The traditional auction is the transfer of specific goods or property rights to the highest bidder. Combinatorial auction is different from traditional auction. Combinatorial auction allows bidders to combine freely in multiple auction items and give the total price as a bid instead of giving the price of the items. Combinatorial auctions have applications in e-commerce, space allocation, cloud computing and so on. The decision of winner is one of the core problems in the field of combinatorial auction, which has important theoretical significance and practical application value. However, the winner decision problem has been proved to be a NP problem in theory, and no exact algorithm can be found to solve it in polynomial time. Although the exact algorithm can prove the optimality of the output solution, with the expansion of the scale of the problem, the solving time it needs will increase exponentially, so it is difficult to deal with complex large-scale examples in acceptable time. This kind of NP problem usually needs to be solved by heuristic algorithm, so that it can be applied in practice. As an important heuristic algorithm, local search is simple and efficient. Local search algorithms have excellent performance in solving various NP problems. Although it can not give the optimal solution and prove its optimality just like the exact algorithm, the local search algorithm can usually give a high quality approximate solution in a shorter time. The winner decision problem is very important in practical application and has received much attention. In this paper, we design and implement a local search algorithm to solve the winner decision problem, which is used to solve large scale examples in a short time and to improve the quality of the solution as much as possible. The proposed algorithm named WDPLS.WDPLS is based on an efficient and concise local search framework with three techniques: pattern detection free bid and pseudo-juxtaposition. Pattern detection is a very efficient backtracking strategy for local search algorithms. For the winner decision problem, we design a pattern definition for WDPLS to prevent the backtracking of greedy search algorithm. Free bids may appear when the algorithm searches. This is a special bid, WDPLS preferred free bid to quickly improve the quality of the solution. In addition, the search process may encounter quality (score) very similar defeat bid. For these bids, pseudo-juxtaposition prevents the algorithm from choosing the highest score bid too greedily, thus providing other high-quality bids with the possibility of being selected, further increasing the diversity of understanding. A large number of experiments on LG datasets show that WDPLS is ahead of the published advanced algorithms in solving quality and time. In particular, although WDPLS is implemented as a single-threaded program in our experiments, it still has a significant advantage over the multithreaded algorithm CARA and the commercial solver CPLEX. At the same time, the experiments also show that the above three main technologies have a positive effect on the performance of WDPLS, which proves their effectiveness.
【學(xué)位授予單位】:東北師范大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:F713.359;TP18
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