实时广告竞拍平台会产生海量的数据,如何对这些数据进行分析和建模会决定广告竞拍的成败.其中一个重要的问题是,如何得到胜出竞价的概率密度函数以便用于指导竞价.在文献(Cui Y,Zhang R,Li W,Mao J.Bid landscape forecasting in online...实时广告竞拍平台会产生海量的数据,如何对这些数据进行分析和建模会决定广告竞拍的成败.其中一个重要的问题是,如何得到胜出竞价的概率密度函数以便用于指导竞价.在文献(Cui Y,Zhang R,Li W,Mao J.Bid landscape forecasting in online ad exchange marketplace.Proceedings of the 17th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining.New York:ACM,2011:265-273)中,雅虎实验室提出了一个技术框架来解决这个问题:首先利用合理的统计学方法对海量数据按照特征属性进行分类;再利用高效的数据结构进行存储,以便快速定位特定属性的信息;最后用梯度提升决策树(gradient boosting decision trees,GBDT)模型和有限混合模型(finite mixture model,FMM)学习得到胜出竞价的分布模型.结合国内竞拍平台的数据特点,在上述文献的基础上,对技术框架进行改进,并提出修正的算法.展开更多
The Chinese tree shrew (Tupaia belangeri chinensis) is a small experimental animal with a close affinity to primates. This species has long been proposed to be an alternative experimental animal to primates in biomedi...The Chinese tree shrew (Tupaia belangeri chinensis) is a small experimental animal with a close affinity to primates. This species has long been proposed to be an alternative experimental animal to primates in biomedical research. Despite decades of study, there is no pure breed for this animal, and the overall genetic diversity of wild tree shrews remains largely unknown. In order to obtain a set of genetic markers for evaluating the genetic diversity of tree shrew wild populations and tracing the lineages in inbreeding populations, we developed 12 polymorphic microsatellite markers from the genomic DNA of the tree shrew. An analysis of a wild population of 117 individuals collected from the suburb of Kunming, China, showed that these loci exhibited a highly expected heterozygosity (0.616). These 12 microsatellites were sufficient for individual identification and parentage analysis. The microsatellite markers developed in this study will be of use in evaluating genetic diversity and lineage tracing for the tree shrew.展开更多
文摘实时广告竞拍平台会产生海量的数据,如何对这些数据进行分析和建模会决定广告竞拍的成败.其中一个重要的问题是,如何得到胜出竞价的概率密度函数以便用于指导竞价.在文献(Cui Y,Zhang R,Li W,Mao J.Bid landscape forecasting in online ad exchange marketplace.Proceedings of the 17th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining.New York:ACM,2011:265-273)中,雅虎实验室提出了一个技术框架来解决这个问题:首先利用合理的统计学方法对海量数据按照特征属性进行分类;再利用高效的数据结构进行存储,以便快速定位特定属性的信息;最后用梯度提升决策树(gradient boosting decision trees,GBDT)模型和有限混合模型(finite mixture model,FMM)学习得到胜出竞价的分布模型.结合国内竞拍平台的数据特点,在上述文献的基础上,对技术框架进行改进,并提出修正的算法.
基金supported by the National 863 Project of China (2012AA021801)grants from Chinese Academy of Sciences (KSCX2-EW-R-11 and KSCX2-EW-J-23)Yunnan Province (2009CI119)
文摘The Chinese tree shrew (Tupaia belangeri chinensis) is a small experimental animal with a close affinity to primates. This species has long been proposed to be an alternative experimental animal to primates in biomedical research. Despite decades of study, there is no pure breed for this animal, and the overall genetic diversity of wild tree shrews remains largely unknown. In order to obtain a set of genetic markers for evaluating the genetic diversity of tree shrew wild populations and tracing the lineages in inbreeding populations, we developed 12 polymorphic microsatellite markers from the genomic DNA of the tree shrew. An analysis of a wild population of 117 individuals collected from the suburb of Kunming, China, showed that these loci exhibited a highly expected heterozygosity (0.616). These 12 microsatellites were sufficient for individual identification and parentage analysis. The microsatellite markers developed in this study will be of use in evaluating genetic diversity and lineage tracing for the tree shrew.
