[Big tensor] Fix paddle.linalg.norm - #74541
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PR Category
Operator Mechanism
PR Types
Bug fixes
Description
paddle.linalg.norm在梯度计算逻辑不一致：在计算无穷范数（L-infinity norm）时，PaddlePaddle与PyTorch对最大值的反向梯度赋值策略存在差异。
PaddlePaddle (current): 将梯度 1 赋给所有的最大值。
PyTorch: 将梯度在所有等于最大值的元素间进行平均分配。