[0-size Tensor Job2 No.72-74] Add 0-size Tensor support for paddle.scatter [fluid_ops] #73933
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co63oc changed the title co63oc changed the title co63oc force-pushed the g61 branch 2 times, most recently from 572f4e6 to c979c1b Compare 
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co63oc added a commit to co63oc/Paddle that referenced this pull request Jul 18, 2025
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PR Category
Operator Mechanism
PR Types
Bug fixes
Description
[0-size Tensor Job2 No.72-74] Add 0-size Tensor support for paddle.scatter
scatter_nd 调用的是scatter_nd_add
index 为0-size在 python部分判断，scatter修改有性能问题，改在kernel中使用phi::Copy，同时修改infermeta判断，符号推导没有对应代码
scatter_nd_add 返回x.clone() + updates, PaddleAPITest 中也是同样实现
https://github.com/PFCCLab/PaddleAPITest/blob/f360ad9c78a0c7ce095ec911ec52a29392a80404/tester/paddle_to_torch/rules.py#L5166
输出维度和输入x维度相同
修改前向，反向，反向updates填充0，PaddleAPITest中为自定义规则
https://github.com/PFCCLab/PaddleAPITest/blob/f360ad9c78a0c7ce095ec911ec52a29392a80404/tester/paddle_to_torch/rules.py#L5124
增加单测，取消已有 TestScatterNdAddWithEmptyIndex 测试
PaddleAPITest测试通过，错误为numpy error
paddle.scatter
paddle.scatter_nd
paddle.scatter_nd_add
