Github user yanboliang commented on the issue:
https://github.com/apache/spark/pull/15621
@sethah I wish you would not mind, I made some reorg for variables of
```WeightedLeastSquares```. Since we use ```bBar, bbBar, aBar, abBar, aaBar```
in standardized space always, I put the standardization code and variable
declaration together. Then if developers would like to know the detail of each
variable, they only need to refer one place which I think is more clear to be
understand. Meanwhile, I improved some naming and fix the minor issue in
```WeightedLeastSquaresSuite```. I wish you like this change and open to hear
your thoughts. If you think it's not necessary, I can also revert that part.
Thanks.
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