fix(test): correct expected buffer size calculation in test_hccl_shared

6月29日评论：

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6月29日评论：

当前仓库存在以下 保护分支 ：

Protected Branch	Version	Release
master
v2.9.0
v2.9.0-26.1.0
v2.7.1
v2.7.1-26.1.0
v2.10.0-26.1.0
v2.11.0-26.1.0
v2.10.0
v2.12.0
v2.11.0
v2.12.0-26.1.0
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6月29日评论：

变更摘要

此 PR 修复了 test_hccl_shared_buffer.py 测试用例中内存期望值计算公式的错误，将容差 tol 的计算方式从"总内存加一次容差"修正为"每个 buffer group 分别计入容差再求和"，使期望内存估算与实际逐 group 累积偏差的行为一致。

主要改动

修正 pg1 内存期望值公式: 将 expected = buffer_size * num_different_buffer_group + tol 改为 expected = (buffer_size + tol) * num_different_buffer_group，使容差随不同 buffer group 的数量等比例缩放。
修正 pg2 内存期望值公式: 同 pg1，将容差从全局一次性叠加改为按 group 累积。
修正 pg3 内存期望值公式: 同 pg1/pg2，保持三处公式一致（第三处还包含一个多余空格的格式微调）。

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6月29日评论：

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6月29日评论：

代码审查

Now let me do the final silent sweep:

Boundary: num_different_buffer_group starts at 0, always incremented to ≥1 before expected computation. No division-by-zero or negative value concerns.
Hot-path: Test code, not applicable.
Co-located: Double-checked lines 316, 328, 341 — only the formula issue found, which is already reported. The [0] indexing on memory_info_before and mem_after tuples from mem_get_info is consistent (unchanged code).

审查总结

优先级	数量
P0	0
P1	0
P2	1
P3	0

已审查文件：

test/distributed/test_hccl_shared_buffer.py — 发现 1 个问题（P2）

整体风险评估： 中等风险。该变更将 tol（注释明确为固定输入/框架开销的容差）从全局加数变为随 buffer group 数量放大的乘数，在 num_different_buffer_group > 1 时使测试的 expected 上界更宽松（多出 buffer_size * 0.25 的额外松弛），可能降低测试对内存回归的检测能力。同时姐妹函数 _test_buffer_memory_with_deleted_pg 未同步更新，形成代码不一致。建议确认 tol 的真实语义后统一处理。

⚠️ 已识别出整体风险，但无法提取行内评论，请参考整体评估。

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6月29日评论：

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流水线 PR-pipeline_pytorch#39803 [ commitID：b00e6a96 ] 已完成

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7月7日评论：

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流水线 PR-pipeline_pytorch#41757 [ commitID：b00e6a96 ] 已完成

>>>代码风格自动修复执行成功（无修复内容）

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R

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7月7日评论：

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7月7日评论：

/lgtm

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