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【Hackathon 5th No.50】 为 Paddle 新增 slice 的 spmd 切分推导规则 #57866

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merged 11 commits into from
Oct 27, 2023

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WintersMontagne10335
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@WintersMontagne10335 WintersMontagne10335 commented Oct 3, 2023

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为 Paddle 新增 slice 的 spmd 切分推导规则
#57262

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paddle-bot bot commented Oct 3, 2023

你的PR提交成功,感谢你对开源项目的贡献!
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@paddle-bot paddle-bot bot added the contributor External developers label Oct 3, 2023
@WintersMontagne10335
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@pkuzyc 老师您好,CI已过,可以review了

const std::vector<int>& starts,
const std::vector<int>& ends,
const std::vector<int64_t>& infer_flags,
const std::vector<int64_t>& decrease_axis) {
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代码里面加上注释

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@pkuzyc 本地代码注释大体已加好,但是,涉及到下面两个点的地方,可能需要修改。麻烦老师先看一下~~


for (int i = 0; i < static_cast<int>(axes.size()); i++) {
int axis = axes[i] < 0 ? axes[i] + input_ndim : axes[i];
input_axes[axis] = special_axes[i];
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为什么需要 special_axes?out_axes 里面切分的维度是 '1',对应的维度不会传到 output 上。

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老师您好。这里借鉴的是split的切分推导规则split 只涉及一个
axis ,它用保留的 k 去做特殊标记。类比过来, slice 涉及多个 axis ,所以需要多个保留的(没用到的)字母去做特殊标记。

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我觉得 slice 可以不用特殊标记,在最后的 log 里把 axes 打一下吧。其他规则里面也会用 'k' 做特殊标记,所以 split 里也用了 'k' 标记。slice 因为有多个 axis,不像 split 只有一个特殊维度,这么标的话也看不出哪些是特殊维度。

for (int i = 0; i < static_cast<int>(axes.size()); i++) {
int axis = axes[i] < 0 ? axes[i] + input_ndim : axes[i];
out_axes[axis] = special_axes[i];
}
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逆向推导的notation和正向保持一致,不一样的话会有点迷惑。

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@WintersMontagne10335 WintersMontagne10335 Oct 27, 2023

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这里也是参照的 split 。我看了下 split 的日志,有一个 notation 是这样的。

  • 正向:abck-->abc1
  • 逆向:abck-->abck

其中, k 是特殊字母。这种算不算保持一致呀?如果不算,按这个例子来说,应该都改成什么样子呢?

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slice 这里都用 abcd --> abc1 这种吧,主要还是因为有多个特殊维度,感觉这样可以直接看出来哪些是切分的。split 我之后看看需不需要改下,这样确实不大一致。

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LGTM

const std::vector<int64_t>& axes,
const std::vector<int>& starts,
const std::vector<int>& ends,
const std::vector<int64_t>& infer_flags,
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如果一些attr 对切分推导无影响,只是为了和 phi ymal 中定义对齐, 用注释说明一下,下个pr 里可以更新一下

@JZ-LIANG JZ-LIANG merged commit b83ce89 into PaddlePaddle:develop Oct 27, 2023
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@JZ-LIANG @pkuzyc 老师要不这个PR先revert一下吧。我今天改52题的时候,突然想到,infer_flagsdecrease_axis 虽然不影响切分结果(单测绕过 空list 了),但是实际场景是可能为 空list 的,所以可能会出错。
黑客松12月15日结束,在那之前,那个bug能修好就行。

danleifeng pushed a commit to danleifeng/Paddle that referenced this pull request Nov 14, 2023
…7866)

* Add spmd segmentation and derivation rules for slice for Paddle

* fix bugs

* fix bugs

* add unit test code

* modified:   test/auto_parallel/spmd_rules/CMakeLists.txt

* test

* fix bugs

* fix bugs
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4 participants