Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/12299#issuecomment-208483664
If I remember correctly, I tested it with MNIST data (784 cols) and saw
significant speed up. But if accuracy is an issue, I would lean towards fixing
it too.
+1 on @srowen 's suggestion of pushing center shift down to Gramian. But it
should be a private API since Gramian is already well defined.
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