Helios Sun

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Hi, some questions about the Algorithm 2 code. In the Shampoo paper, for different dimension it use the original grad![selection_132](https://user-images.githubusercontent.com/7017962/37886091-66ff1146-30eb-11e8-8a63-9afed92e8aec.png) to calculate the contraction![selection_131](https://user-images.githubusercontent.com/7017962/37885956-aa384d0c-30ea-11e8-9e47-9593fb67b05e.png). But in the code, the _grad_...