[API Compatibility] align the loss apis --part#78811

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zhwesky2010 merged 12 commits into

PaddlePaddle:developfrom

Manfredss:ApiEnhance_loss

May 18, 2026

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rename the param and merge the three decorators into one
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进一步简化 loss 系列 API 的 PyTorch 兼容方案：把每个 loss API 的 PyTorch 位置布局与 PyTorch<->Paddle 参数别名合并到一张 ``LEGACY_POS`` 表中，由 ``legacy_reduction_decorator`` 一次性完成位置 -> 关键字、关键字别名重命名、``size_average/reduce`` → ``red…
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fix per feedback
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