@dboyliao Can you add some quick comments on the StridedIterator in this chat? I'm pretty sure you wrote the original stride op

Ok.
The basic idea of StridedIterator is simple, it will give you the linear index/offset of the source tensor given the stride slice specs.
For example, if the given slice specs are 0:3 and 1:5:2 and input tensor of shape (5, 10), all possible strided indices are:

• (0, 1), with linear index 1
• (0, 3), with linear index 3
  ....
• (2, 9), with linear index 29

Then in the strided slice op, I only need to copy value from source tensor based on the linear indices.