Fix random seed of test_lu_op

[Tom-Zheng]

PR types

Bug fixes

PR changes

Others

Description

test_lu_op fails occasionally due to randomness. We fix the random seed in this PR.

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[Tom-Zheng]

Hi @zyfncg , 可否帮忙review & merge?

[Tom-Zheng]

@zhiboniu 可否麻烦review?

[zhiboniu]

这个原来fail的原因是什么？为什么这样修改可以修复问题？

[Tom-Zheng]

这个原来fail的原因是什么？为什么这样修改可以修复问题？

会有一定几率挂掉:

test_lu_op failed
 .F.......
======================================================================
FAIL: test_static (test_lu_op.TestLUAPI)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/opt/paddle/paddle/build/test/legacy_test/test_lu_op.py", line 307, in test_static
    run_lu_static(tensor_shape, dtype)
  File "/opt/paddle/paddle/build/test/legacy_test/test_lu_op.py", line 290, in run_lu_static
    np.testing.assert_allclose(
  File "/usr/local/lib/python3.10/dist-packages/numpy/testing/_private/utils.py", line 1530, in assert_allclose
    assert_array_compare(compare, actual, desired, err_msg=str(err_msg),
  File "/usr/local/lib/python3.10/dist-packages/numpy/testing/_private/utils.py", line 844, in assert_array_compare
    raise AssertionError(msg)
AssertionError: 
Not equal to tolerance rtol=1e-05, atol=1e-05
Mismatched elements: 1 / 375 (0.267%)
Max absolute difference: 2.861023e-05
Max relative difference: 3.5195575e-05
 x: array([[[[ 0.938803,  0.936359,  0.219506,  0.384186,  0.405095],
         [ 0.882509, -0.675834,  0.410817, -0.097641,  0.584958],
         [ 0.747691, -0.430984,  0.147271,  0.095768,  0.820007],...
 y: array([[[[ 0.938803,  0.936359,  0.219506,  0.384186,  0.405095],
         [ 0.882509, -0.675834,  0.410817, -0.097641,  0.584958],
         [ 0.747691, -0.430984,  0.147271,  0.095768,  0.820007],...
----------------------------------------------------------------------

[Tom-Zheng]

@zhiboniu 原来随机种子没固定, 每次跑的数值不同. 有一定概率某些输入会导致误差略大于设定值.

[Tom-Zheng]

Hi @zyfncg , @zhiboniu 已经approve, 您可否帮忙merge?