fix test_depthwise_convoltuion for occasional CI failures (#14016)

* keeping same contexts for comparison

* enabling test

* testing default context

* Revert "testing default context"

This reverts commit 1f95d02.

* Disabling test due to CI failure on MKL-DNN

tests/python/unittest/test_operator.py

@@ -1631,7 +1631,7 @@ def test_convolution_grouping():
                 np.testing.assert_allclose(arr1.asnumpy(), arr2.asnumpy(), rtol=1e-3, atol=1e-3)
 
 
-@unittest.skip("Flaky test https://github.com/apache/incubator-mxnet/issues/12203")
+@unittest.skip("Flaky test https://github.com/apache/incubator-mxnet/issues/14052")
 @with_seed()
 def test_depthwise_convolution():
     for dim in [1,2]:
@@ -1662,7 +1662,7 @@ def test_depthwise_convolution():
 
                             dev = default_context()
                             exe1 = y1.simple_bind(dev, x=shape)
-                            exe2 = y2.simple_bind(mx.cpu(), x=shape, w=(num_filter, shape[1]//num_group)+kernel,
+                            exe2 = y2.simple_bind(dev, x=shape, w=(num_filter, shape[1]//num_group)+kernel,
                                     b=(num_filter,))
                             for arr1, arr2 in zip(exe1.arg_arrays, exe2.arg_arrays):
                                 arr1[:] = np.random.normal(size=arr1.shape)