这由示例中的缩减函数完成，包含缩减阶段。

This is the reduction function in our example and encompasses the reduction phase.

youdao

如果将数据集缩减最多之处的临界点之前的其它阶段也包括进去，可能会进一步提高性能。

Including additional stages past the point at which the data set is most reduced, may lead to additional performance improvements.

youdao

每个阶段表示方差缩减中的80个百分点。

Each phase represents 80 percentage points in the variance reduction.

youdao

So this looks like it's doing a little bit of extra work, but you can see, if you look at that how it cuts it down at each stage.

它就做了很多多余的工作,如果你认真看，你能看到每个阶段,它是如果缩减查找空间的，我要告诉你。

麻省理工公开课 - 计算机科学及编程导论课程节选