[AutoScheduler] Do we have plan to support auto schedule ExternOp?

@comaniac By the way, do you know the specific reason why ops like “scatter” choose to implement use TIR instead of TE?

According to my quick statistic, there are at least 13 ops in relay use TIR as their implementations:

  1. argwhere
  2. non_max_suppression
  3. scanop
  4. scatter
  5. scatter_nd
  6. scatter_add
  7. sort
  8. topk
  9. sparse_reshape
  10. sparse
  11. unique
  12. proposal
  13. multibox