sampling公式汇总srsstratifiedcluster
随机抽样(random sampling)这也是最简单暴力的一种抽样了,就是直接
stratified sampling
其核心概念在于自助采样(bootstrap sampling),给定包含m个样本的数据
gradient-based one-side sampling (goss):在gbdt中,数据集没有权重
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