[spmd_rules] Add SPMD rules for ArgSort operator #72362
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PR Category
Auto Parallel
PR Types
New features
Description
The version upon committing incorporates SPMD rules for the ArgSort operator, covering both the forward and backward passes.
The SPMD rules for both the forward and backward passes simply replicate the sorting axis across one worker mesh dimension. For example, dimension mapping [0, 1, -1], given sorting axis of 1, will be transformed into dimension mapping [0, -1, -1].
The rules that involve splitting the sorting axis are deeply coupled with the reduce communication mechanism. Specifically, merging sorted sequences during reduction is not currently supported and remains a topic for future work.