Github user yanboliang commented on the issue:
https://github.com/apache/spark/pull/13650
@MechCoder It seems there is a typo in the PR's description:
```
The variance is calculated by summing up the mean of the variance of each
decision tree + mean of the prediction^2 of each tree + square(mean of the
prediction of each tree)
```
It should be:
```
The variance is calculated by summing up the mean of the variance of each
decision tree + mean of the prediction^2 of each tree - square(mean of the
prediction of each tree)
```
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