add num_splist for flash_attn_bwd and FlashAttnUnpaddedGradKernel #56363

AnnaTrainingG · 2023-08-16T11:48:08Z

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Description

Pcard-70458
llama模型参考README运行,2CI对别结果如下，loss无diff

具体数据1：

[    INFO] - loss: 2.00048828, learning_rate: 2.1e-06, global_step: 20, interval_runtime: 26.3106, interval_samples_per_second: 6.081193361471736, interval_steps_per_second: 0.760149170183967, epoch: 0.0014
[    INFO] - loss: 1.94342518, learning_rate: 4.1e-06, global_step: 40, interval_runtime: 18.792, interval_samples_per_second: 8.514269788523704, interval_steps_per_second: 1.064283723565463, epoch: 0.0028
[    INFO] - loss: 1.96450806, learning_rate: 6.1e-06, global_step: 60, interval_runtime: 18.8364, interval_samples_per_second: 8.494203585698061, interval_steps_per_second: 1.0617754482122577, epoch: 0.0042
[    INFO] - loss: 1.97299156, learning_rate: 8.1e-06, global_step: 80, interval_runtime: 18.7085, interval_samples_per_second: 8.552269357792328, interval_steps_per_second: 1.069033669724041, epoch: 0.0056
[    INFO] - loss: 1.97750511, learning_rate: 1e-05, global_step: 100, interval_runtime: 18.7949, interval_samples_per_second: 8.512925658562247, interval_steps_per_second: 1.064115707320281, epoch: 0.0069
[    INFO] - loss: 1.95206642, learning_rate: 1e-05, global_step: 120, interval_runtime: 18.7179, interval_samples_per_second: 8.547971573787688, interval_steps_per_second: 1.068496446723461, epoch: 0.0083
[    INFO] - loss: 1.94697475, learning_rate: 1e-05, global_step: 140, interval_runtime: 18.7172, interval_samples_per_second: 8.548273071849662, interval_steps_per_second: 1.0685341339812078, epoch: 0.0097
[    INFO] - loss: 1.96742477, learning_rate: 1e-05, global_step: 160, interval_runtime: 18.9591, interval_samples_per_second: 8.439229664237219, interval_steps_per_second: 1.0549037080296524, epoch: 0.0111
[    INFO] - loss: 1.94573994, learning_rate: 9.999e-06, global_step: 180, interval_runtime: 18.7157, interval_samples_per_second: 8.548989500870817, interval_steps_per_second: 1.0686236876088522, epoch: 0.0125
[    INFO] - loss: 1.9408371, learning_rate: 9.999e-06, global_step: 200, interval_runtime: 18.9711, interval_samples_per_second: 8.433899198356313, interval_steps_per_second: 1.0542373997945391, epoch: 0.0139
[    INFO] - loss: 1.99254551, learning_rate: 9.998e-06, global_step: 220, interval_runtime: 19.6621, interval_samples_per_second: 8.137464978509199, interval_steps_per_second: 1.0171831223136498, epoch: 0.0153
[    INFO] - loss: 1.96885376, learning_rate: 9.997e-06, global_step: 240, interval_runtime: 18.7156, interval_samples_per_second: 8.549017162948847, interval_steps_per_second: 1.0686271453686058, epoch: 0.0167
[    INFO] - loss: 1.97938385, learning_rate: 9.997e-06, global_step: 260, interval_runtime: 18.9203, interval_samples_per_second: 8.456534692087457, interval_steps_per_second: 1.0570668365109321, epoch: 0.0181
[    INFO] - loss: 1.97675762, learning_rate: 9.996e-06, global_step: 280, interval_runtime: 19.3148, interval_samples_per_second: 8.283782019454836, interval_steps_per_second: 1.0354727524318545, epoch: 0.0194
[    INFO] - loss: 1.97571411, learning_rate: 9.995e-06, global_step: 300, interval_runtime: 19.0757, interval_samples_per_second: 8.38764279200571, interval_steps_per_second: 1.0484553490007138, epoch: 0.0208

具体数据2：

[    INFO] - loss: 2.00048828, learning_rate: 2.1e-06, global_step: 20, interval_runtime: 21.0772, interval_samples_per_second: 7.591150606927911, interval_steps_per_second: 0.9488938258659889, epoch: 0.0014
[    INFO] - loss: 1.94342518, learning_rate: 4.1e-06, global_step: 40, interval_runtime: 18.8188, interval_samples_per_second: 8.502147053349322, interval_steps_per_second: 1.0627683816686653, epoch: 0.0028
[    INFO] - loss: 1.96450806, learning_rate: 6.1e-06, global_step: 60, interval_runtime: 18.8288, interval_samples_per_second: 8.497600131243356, interval_steps_per_second: 1.0622000164054195, epoch: 0.0042
[    INFO] - loss: 1.97299156, learning_rate: 8.1e-06, global_step: 80, interval_runtime: 18.7106, interval_samples_per_second: 8.551290530216257, interval_steps_per_second: 1.068911316277032, epoch: 0.0056
[    INFO] - loss: 1.97750511, learning_rate: 1e-05, global_step: 100, interval_runtime: 18.802, interval_samples_per_second: 8.509752841450895, interval_steps_per_second: 1.063719105181362, epoch: 0.0069
[    INFO] - loss: 1.95206642, learning_rate: 1e-05, global_step: 120, interval_runtime: 18.7325, interval_samples_per_second: 8.541326055744099, interval_steps_per_second: 1.0676657569680124, epoch: 0.0083
[    INFO] - loss: 1.94697475, learning_rate: 1e-05, global_step: 140, interval_runtime: 18.744, interval_samples_per_second: 8.53607879100723, interval_steps_per_second: 1.0670098488759037, epoch: 0.0097
[    INFO] - loss: 1.96742477, learning_rate: 1e-05, global_step: 160, interval_runtime: 18.9852, interval_samples_per_second: 8.427604951044907, interval_steps_per_second: 1.0534506188806134, epoch: 0.0111
[    INFO] - loss: 1.94573994, learning_rate: 9.999e-06, global_step: 180, interval_runtime: 18.7522, interval_samples_per_second: 8.532339308513075, interval_steps_per_second: 1.0665424135641344, epoch: 0.0125
[    INFO] - loss: 1.9408371, learning_rate: 9.999e-06, global_step: 200, interval_runtime: 18.9974, interval_samples_per_second: 8.42220448954145, interval_steps_per_second: 1.0527755611926812, epoch: 0.0139
[    INFO] - loss: 1.99254551, learning_rate: 9.998e-06, global_step: 220, interval_runtime: 18.7538, interval_samples_per_second: 8.531624257296887, interval_steps_per_second: 1.0664530321621108, epoch: 0.0153
[    INFO] - loss: 1.96885376, learning_rate: 9.997e-06, global_step: 240, interval_runtime: 18.7428, interval_samples_per_second: 8.536628007676303, interval_steps_per_second: 1.0670785009595378, epoch: 0.0167
[    INFO] - loss: 1.97938385, learning_rate: 9.997e-06, global_step: 260, interval_runtime: 18.8998, interval_samples_per_second: 8.465717244773764, interval_steps_per_second: 1.0582146555967205, epoch: 0.0181
[    INFO] - loss: 1.97675762, learning_rate: 9.996e-06, global_step: 280, interval_runtime: 18.7282, interval_samples_per_second: 8.543248921566835, interval_steps_per_second: 1.0679061151958544, epoch: 0.0194
[    INFO] - loss: 1.97571411, learning_rate: 9.995e-06, global_step: 300, interval_runtime: 18.7413, interval_samples_per_second: 8.537290028215388, interval_steps_per_second: 1.0671612535269235, epoch: 0.0208

不开确定算法的性能：

- loss: 2.00049, learning_rate: 2.1e-06, global_step: 20, interval_runtime: 21.3354, interval_samples_per_second: 7.499260565531818, interval_steps_per_second: 0.9374075706914773, epoch: 0.0014
- loss: 1.94349308, learning_rate: 4.1e-06, global_step: 40, interval_runtime: 18.761, interval_samples_per_second: 8.52834850825146, interval_steps_per_second: 1.0660435635314325, epoch: 0.0028
- loss: 1.96464062, learning_rate: 6.1e-06, global_step: 60, interval_runtime: 18.8037, interval_samples_per_second: 8.508971442820126, interval_steps_per_second: 1.0636214303525158, epoch: 0.0042
- loss: 1.97301292, learning_rate: 8.1e-06, global_step: 80, interval_runtime: 18.6895, interval_samples_per_second: 8.560953695414609, interval_steps_per_second: 1.0701192119268261, epoch: 0.0056
- loss: 1.97778549, learning_rate: 1e-05, global_step: 100, interval_runtime: 18.7648, interval_samples_per_second: 8.526600043709887, interval_steps_per_second: 1.065825005463736, epoch: 0.0069
- loss: 1.95245552, learning_rate: 1e-05, global_step: 120, interval_runtime: 18.7123, interval_samples_per_second: 8.550504971226191, interval_steps_per_second: 1.068813121403274, epoch: 0.0083
- loss: 1.94730988, learning_rate: 1e-05, global_step: 140, interval_runtime: 18.7294, interval_samples_per_second: 8.54271657817509, interval_steps_per_second: 1.0678395722718863, epoch: 0.0097
- loss: 1.96823559, learning_rate: 1e-05, global_step: 160, interval_runtime: 18.9585, interval_samples_per_second: 8.439481829428935, interval_steps_per_second: 1.0549352286786169, epoch: 0.0111
- loss: 1.94611969, learning_rate: 9.999e-06, global_step: 180, interval_runtime: 18.7352, interval_samples_per_second: 8.540070636271357, interval_steps_per_second: 1.0675088295339197, epoch: 0.0125
- loss: 1.9408411, learning_rate: 9.999e-06, global_step: 200, interval_runtime: 18.9657, interval_samples_per_second: 8.436264988184817, interval_steps_per_second: 1.0545331235231021, epoch: 0.0139
- loss: 1.99281082, learning_rate: 9.998e-06, global_step: 220, interval_runtime: 18.7107, interval_samples_per_second: 8.551269282269537, interval_steps_per_second: 1.0689086602836921, epoch: 0.0153

paddle-bot · 2023-08-16T11:48:13Z

你的PR提交成功，感谢你对开源项目的贡献!
请关注后续CI自动化测试结果，详情请参考Paddle-CI手册。
Your PR has been submitted. Thanks for your contribution!
Please wait for the result of CI firstly. See Paddle CI Manual for details.

Xreki · 2023-08-17T02:03:15Z

test/legacy_test/test_flash_attention.py

+        paddle.set_flags({'FLAGS_cudnn_deterministic': 1})
+        self.test_dot_scale_product()
+        paddle.set_flags({'FLAGS_cudnn_deterministic': 0})
+


需添加单测对比2次执行结果，输入相同时，要保证得到完全一样的输出，结果比较用np.equal

Xreki

PR需要更新flash-attention的submodule，ci才能测试到flash-attention repo的修改

Xreki · 2023-08-18T00:58:07Z

test/legacy_test/test_flash_attention.py

+        np.testing.assert_allclose(out1.numpy(), out1_, rtol=5e-03, atol=1e-03)
+
+        out2, out2_ = self.get_out_data()
+        np.equal(out1.numpy(), out2.numpy())


np.equal只是得到比较的结果，还需要加assert

已经修改

fa的PR还没有合入 submodule暂时无法更新

为了在PR中验证正确性，可以先把submodule更新到自己fork的版本

Xreki

更新一下flash-attn的submodule
补充一下算子级和模型级的性能测试结果吧，确定性实现肯定比非确定性实现慢，需要看下大约慢多少。

Xreki · 2023-08-30T06:20:41Z

paddle/phi/kernels/gpu/flash_attn_grad_kernel.cu

+    int num_splits = 0;  // 0 for an internal heuristic, which is optimal
+    if (FLAGS_cudnn_deterministic) {
+      num_splits = 1;
+    }


封装成一个函数

Xreki · 2023-08-30T06:25:55Z

test/legacy_test/test_flash_attention.py

@@ -306,6 +302,29 @@ def test_all(self):
            np.testing.assert_allclose(
                fetches_result[0], out_, rtol=5e-03, atol=1e-03
            )
+            return out, out_, fetches_result[0]


fetches_result[0]是静态图执行的前向输出吧，确定性实现可以只比较测试动态图，但是需要检查前向out和反向的dq、dk、dv，保证两次执行的结果完全一样。

umiswing · 2023-09-04T02:34:21Z

paddle/phi/kernels/gpu/flash_attn_grad_kernel.cu

+  // 0 for an internal heuristic, which is optimal
+  return FLAGS_cudnn_deterministic ? 1 : 0;
+}
+


这个函数，以及kernel中两处int num_splits = get_num_split();建议直接封装在FlashAttnBwdParamsV2里面。

下个PR再改

risemeup1

LGTM

ZzSean

LGTM for skipIf

wanghuancoder

LGTM

Xreki · 2023-09-04T08:19:34Z

test/legacy_test/test_flash_attention_deterministic.py

@@ -0,0 +1,208 @@
+# Copyright (c) 2023 PaddlePaddle Authors. All Rights Reserved.


这个单测挪出来了吗？那需要加到GPUPS CI跑的单测列表里面去，下个PR加下吧。

…ttnUnpaddedGradKernel (PaddlePaddle#56363) * add num_splist for flash_attn_bwd and FlashAttnUnpaddedGradKernel * Add assertTrue * Update submodule to a specific commit

add num_splist for flash_attn_bwd and FlashAttnUnpaddedGradKernel

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AnnaTrainingG added 6 commits August 30, 2023 16:06

Update submodule to a specific commit

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Xreki merged commit 7fd6ffb into PaddlePaddle:develop Sep 4, 2023

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add num_splist for flash_attn_bwd and FlashAttnUnpaddedGradKernel #56363

add num_splist for flash_attn_bwd and FlashAttnUnpaddedGradKernel #56363

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		@@ -0,0 +1,208 @@
		# Copyright (c) 2023 PaddlePaddle Authors. All Rights Reserved.

add num_splist for flash_attn_bwd and FlashAttnUnpaddedGradKernel #56363

add num_splist for flash_attn_bwd and FlashAttnUnpaddedGradKernel #56363

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AnnaTrainingG commented Aug 16, 2023 •

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