[Auto Parallel] Add a case when the target shape is 1 in reshape spmd rule. #63681
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PR Category
Auto Parallel
PR Types
Bug fixes
Description
Pcard-76459
Cover the following case in reshape spmd rule:
shape: [1, 512, 4096] --> [1, 2, 256, 4096],
input dims_mapping: [0, 1, -1]
expected output dims_mapping: [0, 1, -1, -1] (not [-1, 1, -1,-1])
In this case, the dim0 in target shape is 1 and it is from dim0 in source shape. make the dim0's transformation be InputDim rather than Singleton so that the sharding status can be propagated.