meissnereric commented on issue #9295: test_operator.test_laop_3 hangs
URL: 
https://github.com/apache/incubator-mxnet/issues/9295#issuecomment-356937657
 
 
   Hmm, the plot thickens. 
   
   So on a c5.2xlarge instance I built mxnet from source using USE_MKL2017=1, 
USE_MKL2017_EXPERIMENTAL=1, USE_BLAS=openblas flags this morning and ran
   PYTHONPATH=./python/ nosetests3 --verbose tests/python/unittest 
   
   3 separate times test_operator.test_laop_3 FAILED apparently due to some 
numerical issues. I haven't seen anyone mention this test failing yet, but it 
didn't hang for me at all. It's the only test to return a FAILURE as well.
   
   Thoughts?
   
   ======================================================================
   FAIL: test_operator.test_laop_3
   ----------------------------------------------------------------------
   Traceback (most recent call last):
     File "/usr/lib/python3/dist-packages/nose/case.py", line 198, in runTest
       self.test(*self.arg)
     File 
"/home/ubuntu/src/incubator-mxnet/tests/python/unittest/test_operator.py", line 
4278, in test_laop_3
       check_fw(test_syevd2, [data_in1], [res_eye, res_a])
     File 
"/home/ubuntu/src/incubator-mxnet/tests/python/unittest/test_operator.py", line 
4253, in <lambda>
       atol=atol_fw, dtype=dtype)
     File "/home/ubuntu/src/incubator-mxnet/python/mxnet/test_utils.py", line 
997, in check_symbolic_forward
       equal_nan=equal_nan)
     File "/home/ubuntu/src/incubator-mxnet/python/mxnet/test_utils.py", line 
495, in assert_almost_equal
       raise AssertionError(msg)
   AssertionError:
   Items are not equal:
   Error 2142110.669088 exceeds tolerance rtol=0.000001, atol=0.000001.  
Location of maximum error:(5, 7), a=3.772180, b=0.518782
    EXPECTED_Ut_L_U_output: array([[ -6.29539959,   3.14786301,  -7.76048236, 
..., -14.55426068,
             5.89200304,   2.89609144],
          [  3.14786301,  -2.20936719,  -5.00206088, ...,   2.18995202,...
    FORWARD_Ut_L_U_output: array([[ -5.86758909,   2.1861068 ,  -8.22037894, 
..., -15.72788167,
             7.86870499,   2.89609144],
          [  2.1861068 ,  -3.11242836,  -5.28864811, ...,   3.78613349,...
   
   ----------------------------------------------------------------------

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