摘要:
1、移除低方差的特征(Removing features with low variance) VarianceThreshold 是特征选择中的一项基本方法。它会移除所有方差不满足阈值的特征。默认设置下,它将移除所有方差为0的特征,即那些在所有样本中数值完全相同的特征。 这里的方差是特征值的方差, 阅读全文
摘要:
The overall parameters have been divided into 3 categories by XGBoost authors: general parameters Select the type of model to run at each iteration. I 阅读全文
摘要:
XGBoost训练: It is not easy to train all the trees at once. Instead, we use an additive strategy: fix what we have learned, and add one new tree at a ti 阅读全文