arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1408.4072cs.LGcs.DBcs.DS
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索引成本敏感预测

Indexing Cost Sensitive Prediction

Leilani Battle, Edward Benson, Aditya Parameswaran, Eugene Wu

摘要:

预测模型通常用于实时决策。然而,典型的机器学习技术忽略了特征评估成本,并且仅关注利用所有可用特征获得的机器学习模型的准确性。我们开发算法和索引来支持成本敏感预测,即,使用考虑特征评估成本的机器学习模型做出决策。给定一个项目和在线计算成本(即,时间)预算,我们提出了两种方法来返回一个适当选择的机器学习模型,该模型将在指定的时间内运行在给定的项目上。第一种方法返回最佳机器学习模型,即,一个具有最高精度,在指定时间内运行,但需要大量的前期预计算时间。第二种方法返回可能次优的机器学习模型,但需要很少的前期预计算时间。我们详细研究了这两种算法,并描述了每种算法都表现良好的场景(使用真实和合成数据)。与专注于狭窄领域或特定算法的先前工作不同,我们的技术非常通用:它们适用于任何机器学习算法上的任何成本敏感预测场景。

英文摘要:

Predictive models are often used for real-time decision making. However, typical machine learning techniques ignore feature evaluation cost, and focus solely on the accuracy of the machine learning models obtained utilizing all the features available. We develop algorithms and indexes to support cost-sensitive prediction, i.e., making decisions using machine learning models taking feature evaluation cost into account. Given an item and a online computation cost (i.e., time) budget, we present two approaches to return an appropriately chosen machine learning model that will run within the specified time on the given item. The first approach returns the optimal machine learning model, i.e., one with the highest accuracy, that runs within the specified time, but requires significant up-front precomputation time. The second approach returns a possibly sub- optimal machine learning model, but requires little up-front precomputation time. We study these two algorithms in detail and characterize the scenarios (using real and synthetic data) in which each performs well. Unlike prior work that focuses on a narrow domain or a specific algorithm, our techniques are very general: they apply to any cost-sensitive prediction scenario on any machine learning algorithm.

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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