[GitHub] jasonyu1996 commented on issue #12327: [Feature Request] support of diag for N-d arrays

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jasonyu1996 commented on issue #12327: [Feature Request] support of diag for N-d arrays
URL: https://github.com/apache/incubator-mxnet/issues/12327#issuecomment-418571963
 
 
   @samskalicky Yes. Actually I have already implemented one version in this way (https://github.com/apache/incubator-mxnet/pull/12430), simply traversing and copying the data. However, I actually think it more efficient to just generate a new view, as is the case in numpy. The problem here is that MXNet seems to lack a good support for this, as I have reported here 
   https://github.com/apache/incubator-mxnet/issues/12449 .
   
   As for the possible usage of a diagonal operator, as far as I know, it is sometimes necessary to compute a regularizer based on the diagonal of a matrix (or the diagonals of a batch of matrices). `trace` might be sufficient at times, but in other cases, it might be more flexible to operate on the diagonal itself (e.g., when taking norm of the diagonal).

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