ChaiBapchya commented on issue #10227: Flaky test: test_operator.test_layer_norm
URL: 
https://github.com/apache/incubator-mxnet/issues/10227#issuecomment-537596535
 
 
   Happened again: #16336 (unrelated PR)
   
http://jenkins.mxnet-ci.amazon-ml.com/blue/organizations/jenkins/mxnet-validation%2Funix-cpu/detail/PR-16336/7/pipeline/
   ```
   ======================================================================
   
   FAIL: test_operator.test_layer_norm
   
   ----------------------------------------------------------------------
   
   Traceback (most recent call last):
   
     File "/usr/local/lib/python3.5/dist-packages/nose/case.py", line 198, in 
runTest
   
       self.test(*self.arg)
   
     File "/work/mxnet/tests/python/unittest/test_operator.py", line 3863, in 
test_layer_norm
   
       finite_grad_check=finite_grad_check)
   
     File "/work/mxnet/tests/python/unittest/test_operator.py", line 3733, in 
check_layer_normalization
   
       assert_almost_equal(exe.grad_dict['data'].asnumpy(), gt_data_grad, 
backward_check_eps, backward_check_eps)
   
     File "/work/mxnet/python/mxnet/test_utils.py", line 533, in 
assert_almost_equal
   
       raise AssertionError(msg)
   
   AssertionError: 
   
   Items are not equal:
   
   Error 1.454597 exceeds tolerance rtol=0.000100, atol=0.000100.  Location of 
maximum error:(8, 3, 0), a=0.732305, b=0.732053
   
    a: array([[[ -2.4676247 ,   0.11147801,   1.2913225 ,   0.03173554,
   
              1.0330889 ],
   
           [  1.348523  ,  -0.26897073,   0.22984871,  -0.33579123,...
   
    b: array([[[ -2.4676248 ,   0.111478  ,   1.29132235,   0.03173556,
   
              1.03308889],
   
           [  1.34852288,  -0.2689707 ,   0.22984875,  -0.33579115,...
   ```

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