Scan on a non-zero axis

Questions
1

If I have a tensor of shape (N, M, K) and I want to do a scan on the M-axis, I have to create an “init” and “state” that have M in the 0th dimension. If the result needs to have the same shape as the original, the output of the scan will need to be copied over.

  1. Are there any tricks to avoid the creation of temporary storage by scan and then copying it?
  2. Is there any plan to allow doing a scan on a non-0th axis?
  3. Right now, a ScanOp cannot be inlined. Is this a design decision, or is it just a current limitation?
2

Hi, I meet the same problem, have you solved it now?

3

I ended up not using scan. I used extern tensor instead, and I wrote the generating function myself.

4

I also just encountered this :slight_smile: