Wrong matrix power?

[jacobhilton]

In your pseudocode, you take H_t^i to the power -1/(2k), but in your code you take precond to the power -1 / order, not -1 / (2 * order). Is this a bug or am I missing something?

[moskomule]

Hi, thank you for reporting. I implemented Shampoo long ago, so I don't remember why I did so.
If you find this is a critical, could you send me a PR?

[jacobhilton]

Thanks for your reply. I don't plan to use this in the future so it is not critical for me.