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    12.6.static Class MembersIt is sometimesnecessary for all the objects of a particular class type to access a globalobject. Perhaps a count is needed of how many objects of a partic

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特征选择和特征抽取特征选择(feature selection)特征抽取是从一系列的候选变量/特征中抽取其中的一个子集作为机器学习的输入, 其能提高各种分类器(classifier)的性能(performance)特征抽取(feature extraction)Filter Methods 过滤方法Wrapper Meth

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做对比实验的时候, 如果需要实验XX特性的时候需要进行随机实验, 此时分为如下两个组.treatment group:    表示带有XX特性的实验.control group:   表示没有带有XX特性的实验.XX特性可能很多是需要测试的特性, 外部选择是否加上XX特性http://www.ncsu.edu/labwrite/il/controlt

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