[Cherry-Pick][PHI] non-contiguous paddle.nansum accuracy matching

[Enigmatisms]

PR Category

Operator Mechanism

PR Types

Improvements

Description

从主仓：

• [PHI] non-contiguous paddle.nansum accuracy matching #78219
  Cherry-pick 而来

将组合算子 paddle.nansum 改造为 PHI 算子，以对 PyTorch 做精度对齐。组合算子的 paddle.where 会强制把不连续 tensor 转为连续，导致累加顺序变化 (@baoqiwen)。复用 phi::Reduce 操作以及手动实现的 NanSumOps 可修正此问题。

本 PR 需要考虑 non-contiguous layout，所以在 strided ops 里增加了 nansum。

注意！ 本 PR 与 dev 分支也有一定的差别：

• dev 分支由于有一个 commit 修改了 phi::Full 操作，这个commit修改量巨大，并没有 CP 到 release3.3，故本 PR 将 Full 操作的写法 revert 到了对应 commit 之前。只有 phi::Full 的调用方法相关代码有差别。

大 Tensor 精度对齐测试：

Torch 对齐精度测试：

是否引起精度变化

是

devPR:#78219

Pcard-89620

[paddle-bot]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 79.24528% with 11 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release/3.3@de52ccb). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
.../interface/infer_symbolic_shape/unary_infer_sym.cc	0.00%	11 Missing ⚠️

❌ Your patch status has failed because the patch coverage (79.24%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@              Coverage Diff               @@
##             release/3.3   #78296   +/-   ##
==============================================
  Coverage               ?   79.24%           
==============================================
  Files                  ?        4           
  Lines                  ?       53           
  Branches               ?        0           
==============================================
  Hits                   ?       42           
  Misses                 ?       11           
  Partials               ?        0           

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[risemeup1]

LGTM for coverage，覆盖率机制问题，实验表明测试PR #78297 可以走到这段代码，但是覆盖率统计不到，故豁免

[Enigmatisms]

单个文件 Coverage 未覆盖的问题与

• [PHI] non-contiguous paddle.nansum accuracy matching #78219
  相同。见此 PR。

[wanghuancoder]

LGTM