Failing nightly test: test_dcgan (test_notebooks_single_gpu.StraightDopeSingleGpuTests)

[marcoabreu]

http://jenkins.mxnet-ci.amazon-ml.com/blue/organizations/jenkins/NightlyTests_onBinaries/detail/NightlyTests_onBinaries/148/pipeline

FAIL: test_dcgan (test_notebooks_single_gpu.StraightDopeSingleGpuTests)

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Traceback (most recent call last):

  File "/work/mxnet/tests/nightly/straight_dope/test_notebooks_single_gpu.py", line 249, in test_dcgan

    assert _test_notebook('chapter14_generative-adversarial-networks/dcgan')

AssertionError

[kalyc]

The test is not Flaky.
This PR #12537 - reverts the change in the NDArrayIter

[WIP] PR - #12545 to capture edge case of empty label

[sandeep-krishnamurthy]

Resolving this issue as the change is reverted and tests are passing.