Add device and base class usage to Deepsvdd

[yqin43]

All Submissions Basics:

• [ ] 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?

[coveralls]

Pull Request Test Coverage Report for Build 10035316067

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 9 of 9 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.001%) to 95.68%

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Totals
Change from base Build 9825315463:	0.001%
Covered Lines:	9678
Relevant Lines:	10115

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💛 - Coveralls