Re-enabling randomized test_operator/test_operator_gpu.test_dot

[haojin2]

Description

Getting rid of the fixed seed for test_operator/test_operator_gpu.test_dot as the flakiness cannot be reproduced.

Checklist

Essentials

• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage:
• Unit tests are added for small changes to verify correctness (e.g. adding a new operator)
• Nightly tests are added for complicated/long-running ones (e.g. changing distributed kvstore)
• Build tests will be added for build configuration changes (e.g. adding a new build option with NCCL)
• Code is well-documented:
• For user-facing API changes, API doc string has been updated.
• For new C++ functions in header files, their functionalities and arguments are documented.
• For new examples, README.md is added to explain the what the example does, the source of the dataset, expected performance on test set and reference to the original paper if applicable
• Check the API doc at http://mxnet-ci-doc.s3-accelerate.dualstack.amazonaws.com/PR-$PR_ID/$BUILD_ID/index.html
• To the my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change

Changes

• Get rid of the fixed seed for test_operator/test_operator_gpu.test_dot

Comments

Can pass more than 10000 times on both CPU & GPU:

MXNET_TEST_COUNT=10000 nosetests -s --verbose tests/python/unittest/test_operator.py:test_dot
/home/ubuntu/anaconda3/lib/python3.6/site-packages/urllib3/contrib/pyopenssl.py:46: DeprecationWarning: OpenSSL.rand is deprecated - you should use os.urandom instead
  import OpenSSL.SSL
/home/ubuntu/anaconda3/lib/python3.6/site-packages/nose/util.py:453: DeprecationWarning: inspect.getargspec() is deprecated, use inspect.signature() or inspect.getfullargspec()
  inspect.getargspec(func)
[INFO] Setting module np/mx/python random seeds, use MXNET_MODULE_SEED=194063305 to reproduce.
test_operator.test_dot ... ok

----------------------------------------------------------------------
Ran 1 test in 9446.096s

OK

MXNET_TEST_COUNT=10000 nosetests -s --verbose tests/python/gpu/test_operator_gpu.py:test_dot
/home/ubuntu/anaconda3/lib/python3.6/site-packages/urllib3/contrib/pyopenssl.py:46: DeprecationWarning: OpenSSL.rand is deprecated - you should use os.urandom instead
  import OpenSSL.SSL
/home/ubuntu/anaconda3/lib/python3.6/site-packages/nose/util.py:453: DeprecationWarning: inspect.getargspec() is deprecated, use inspect.signature() or inspect.getfullargspec()
  inspect.getargspec(func)
[INFO] Setting module np/mx/python random seeds, use MXNET_MODULE_SEED=2632151 to reproduce.
test_operator_gpu.test_dot ... ok

----------------------------------------------------------------------
Ran 1 test in 36.951s

OK

[haojin2]

@marcoabreu

[haojin2]

Problem of fixed seed tracked at #11714

[marcoabreu]

Feel free to remove that comment

[haojin2]

Let's still keep it here, in case if it fails on some other platforms, or we detect any regression on this operator in the future. What do you think?

[marcoabreu]

Sounds good to me

[haojin2]

@marcoabreu Checks passed, please merge when you feel comfortable to do so.