Sod implementation

[John-Almardeny]

All Submissions Basics:

#60

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you checked all Issues to tie the PR to a specific one?

All Submissions Cores:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?
• Does your submission pass tests, including CircleCI, Travis CI, and AppVeyor?
• Does your submission have appropriate code coverage? The cutoff threshold is 95% by Coversall.

New Model Submissions:

• Have you created a .py in ~/pyod/models/?
• Have you created a _example.py in ~/examples/?
• Have you created a test_.py in ~/pyod/test/?
• Have you lint your code locally prior to submission?

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Description

[coveralls]

Pull Request Test Coverage Report for Build 957

• 158 of 159 (99.37%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 95.649%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pyod/test/test_sod.py	103	104	99.04%

Totals
Change from base Build 956:	0.1%
Covered Lines:	3979
Relevant Lines:	4160

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💛 - Coveralls

[yzhao062]

If the PR is in the good state, could you submit the PR to development branch? Thanks, Yue

[John-Almardeny]

@yzhao062 Oops I just missed this. I changed the base now to development.

[John-Almardeny]

Hi Yue @yzhao062
I am happy with it now.
Please consider checking this PR.
Kind Regards,
Yahya.