Thanks, yeah I also remember `te.scan` only supports scanning along the first
axis. I think `te.extern` is good as a first step.
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We have tried using te.scan and te.compute to implement cumsum. But it seems
that there is no way to use the same formula to adapt to all situations.
Finally, we implement it with te.extern.
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I'll make them down into several prs, than send them directly. Thank you.
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I'm curious, how did you implement cumsum? I also wanted cumsum op a while
back, but for me it was not clear how it can be implemented efficiently in TVM.
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I think we could just send pr directly. Of course, we could make them be
several prs, not one big pr.
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nice job! If it works out, it will be really helpful!
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## Motivation
In order to enrich the support of TF operator and the need of practical work,
we add 15 operators to TVM.
as follows:
* Expm1, Rint, Softsign, Cumprod, Cumsum
* SegmentMax, SegmentMin, SegmentMean, SegmentPord, SegmentSum
* UnsortedSegmentMax, UnsortedSegmen
