新的模块sklearn.model_selection,将以前的sklearn.cross_validation
, sklearn.grid_search
和 sklearn.learning_curve模块组合到一起
比如:cross_validation模块弃用,所有的包和方法都在model_selection中,包和方法名没有发生变化
详见http://scikit-learn.org/stable/modules/cross_validation.html#cross-validation-iterators-with-stratification-based-on-class-labels