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[CoreML] Solve CoreML frontend issue of image scaler and padding #3800
I find the codebase of master branch's CI is red (http://ci.tvm.ai:8080/blue/organizations/jenkins/tvm/detail/master/1459/pipeline) after merged, however, CI is green as seen when PR is made and I can not reproduce the issue. @tqchen Do we need to restart the CI?
After tried it about ~100 times, I reproduce it. It is one occasionally problem and seems only happened on CUDA (with Cython3 enabled). When we turn on opt_level=3, we call alter_op_layout pass and when we insert one pad with all zeros (i.e. pad(0,0,0,0), we will meet layout problem. However, it shouldn't be. I think I could do one quickfix in coreml frontend. (i.e. When we meet all pad values is zero, we avoid insert
I will try to spare time to construct one reproduce issue and try to find the root cause then fix it.