arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.5601cs.AIcs.LG
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具有测试代价约束的特征选择

Feature selection with test cost constraint

Zhangzhou Normal University(漳州师范学院);Tianjin University(天津大学)

Fan Min, Qinghua Hu, William Zhu

摘要:

特征选择是机器学习和数据采掘中重要的预处理步骤。在现实世界的应用程序中,需要成本,包括金钱,时间和其他资源,以获得功能。在某些情况下,由于资源有限,存在测试成本约束。我们将故意选择一个信息丰富且廉价的特征子集进行分类。针对这一问题,提出了带测试成本约束的特征选择问题.新问题具有简单的形式,同时描述为一个约束满足问题(CSP)。回溯算法是求解CSP问题的一种通用算法,对于中等规模的数据,回溯算法是解决新问题的有效方法。由于回溯算法不适用于大型数据集,还开发了一种启发式算法。实验结果表明,该启发式算法在大多数情况下都能找到最优解。我们还重新定义了一些现有的特征选择问题的粗糙集,特别是决策理论粗糙集,从CSP的观点。这些新的定义提供了一些新的研究方向的见解。

英文摘要:

Feature selection is an important preprocessing step in machine learning and data mining. In real-world applications, costs, including money, time and other resources, are required to acquire the features. In some cases, there is a test cost constraint due to limited resources. We shall deliberately select an informative and cheap feature subset for classification. This paper proposes the feature selection with test cost constraint problem for this issue. The new problem has a simple form while described as a constraint satisfaction problem (CSP). Backtracking is a general algorithm for CSP, and it is efficient in solving the new problem on medium-sized data. As the backtracking algorithm is not scalable to large datasets, a heuristic algorithm is also developed. Experimental results show that the heuristic algorithm can find the optimal solution in most cases. We also redefine some existing feature selection problems in rough sets, especially in decision-theoretic rough sets, from the viewpoint of CSP. These new definitions provide insight to some new research directions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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