Merge remote-tracking branch 'upstream/master' into feature/cudnn_det…

…erministic

tests/python/unittest/test_operator.py

@@ -768,6 +768,7 @@ def fleaky_relu_grad(grad, x, y, act_type, slope=0.25):
 # NOTE(haojin2): Skipping the numeric check tests for float16 data type due to precision issues,
 # the analytical checks are still performed on each and every data type to verify the correctness.
 @with_seed()
+@unittest.skip("Flaky test tracked by https://github.com/apache/incubator-mxnet/issues/12885")
 def test_prelu():
     def fprelu(x, gamma):
         pos_indices = x > 0
@@ -5792,6 +5793,7 @@ def test_stack():
 
 
 @with_seed()
+@unittest.skip("Flaky test, tracked at https://github.com/apache/incubator-mxnet/issues/12314")
 def test_dropout():
     def zero_count(array, ratio):
         zeros = 0