[GitHub] szha commented on issue #13001: Feature request: numpy.cumsum

[GitBox <gi...@apache.org>]

szha commented on issue #13001: Feature request: numpy.cumsum
URL: https://github.com/apache/incubator-mxnet/issues/13001#issuecomment-434163210
 
 
   `cumsum` is needed when you have an array of lengths with which to slice another concatenated array, and you want to calculate the start and end index to use. For example, suppose you have three arrays of different lengths, and you concatenated them like:
   `[1, 2, 3], [4, 5], [6, 7, 8, 9] => [1, 2, 3, 4, 5, 6, 7, 8, 9]`
   Their corresponding lengths are `[3, 2, 4]`.
   The `cumsum` would be `[3, 5, 9]`, with which you can slice `[0, 3)` for first array, `[3, 5)` for second array, and `[5, 9)` for third array.

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