cross_validation模块已被弃用
sklearn.model_selection模块包含了以前的sklearn.cross_validation
, sklearn.grid_search
和 sklearn.learning_curve模块的所有函数,因此当需要使用上述模块中的函数时,导入sklearn.model_selection包即可。
详见http://scikit-learn.org/stable/modules/cross_validation.html#cross-validation-iterators-with-stratification-based-on-class-labels