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### Description <!-- Describe your changes. --> Split out the more basic changes from #15552 for easier review. Re-organize to clarify the structure - Separate out generic base functionality from ORT specific components - pass in handlers for internal ORT ops to Optimize - Split out layout transformation from transpose optimization - Separate out level 1 transpose optimizer - Cleanup some naming to try and clarify things like an optimizer vs. general optimization code Most of the changes are from this movement of code. Two implementation changes: - the extended handlers are queried first in GetHandler - allows the extended handlers to override the default behaviour for an ONNX operator - simplify the Optimize function to remove OptimizerMode. - `can_modify_node` is used instead of `mode` and `ignore_assigned_nodes` and a long description of the current usage is added. I don't _think_ that changes the current behavior and hopefully clarifies what happens and when, and makes the base transpose optimizer implementation more generic. ### Motivation and Context <!-- - Why is this change required? What problem does it solve? - If it fixes an open issue, please link to the issue here. --> Create a cleaner separation to support adding EP specific logic next to cleanly handle where an EP has additional layout sensitive behaviour required (e.g. it's Resize implementation only handles one layout). |
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