Nightly test fail: Python 2 and Python 3 tutorial tests

[perdasilva]

Description

Nightly tests for binaries failing against master.

http://jenkins.mxnet-ci.amazon-ml.com/blue/organizations/jenkins/NightlyTestsForBinaries/detail/master/247/pipeline

Both Tutorial: Python 2 and Tutorial: Python 3 steps are failing with:

======================================================================
FAIL: test_tutorials.test_gluon_save_load_params
----------------------------------------------------------------------
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/tutorials/test_tutorials.py", line 107, in test_gluon_save_load_params
    assert _test_tutorial_nb('gluon/save_load_params')
AssertionError

======================================================================
FAIL: test_tutorials.test_gluon_hybrid
----------------------------------------------------------------------
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/tutorials/test_tutorials.py", line 110, in test_gluon_hybrid
    assert _test_tutorial_nb('gluon/hybrid')
AssertionError

======================================================================
FAIL: test_tutorials.test_onnx_fine_tuning_gluon
----------------------------------------------------------------------
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/tutorials/test_tutorials.py", line 137, in test_onnx_fine_tuning_gluon
    assert _test_tutorial_nb('onnx/fine_tuning_gluon')
AssertionError

======================================================================
FAIL: test_tutorials.test_onnx_inference_on_onnx_model
----------------------------------------------------------------------
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/tutorials/test_tutorials.py", line 140, in test_onnx_inference_on_onnx_model
    assert _test_tutorial_nb('onnx/inference_on_onnx_model')
AssertionError

[mxnet-label-bot]

Hey, this is the MXNet Label Bot.
Thank you for submitting the issue! I will try and suggest some labels so that the appropriate MXNet community members can help resolve it.
Here are my recommended labels: Test, Doc

[andrewfayres]

@mxnet-label-bot add [Test, Needs Triage]

[andrewfayres]

@mxnet-label-bot add [Need Triage]

[ThomasDelteil]

this PR introduced new warnings, warnings makes the tests fail tutorials #14214