add devnet algorithm

[Yeechin-is-here]

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 9533554396

Details

• 0 of 214 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-2.0%) to 91.963%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pyod/models/devnet.py	0	214	0.0%
<!--	Total:	0	214	0.0%	-->

Totals
Change from base Build 9457434073:	-2.0%
Covered Lines:	9394
Relevant Lines:	10215

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9556163219

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

• 235 of 297 (79.12%) changed or added relevant lines in 2 files are covered.
• 16 unchanged lines in 7 files lost coverage.
• Overall coverage decreased (-0.3%) to 93.663%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pyod/test/test_devnet.py	82	83	98.8%
pyod/models/devnet.py	153	214	71.5%
<!--	Total:	235	297	79.12%	-->

Files with Coverage Reduction	New Missed Lines	%
pyod/test/test_dif.py	1	98.84%
pyod/models/deep_svdd.py	1	99.25%
pyod/test/test_auto_encoder.py	1	98.75%
pyod/test/test_torch_utility.py	1	99.16%
pyod/test/test_vae.py	2	97.5%
pyod/test/test_base_dl.py	3	96.64%
pyod/models/base_dl.py	7	94.93%
<!--	Total:	16		-->

Totals
Change from base Build 9457434073:	-0.3%
Covered Lines:	9577
Relevant Lines:	10225

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9556515395

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

• 235 of 297 (79.12%) changed or added relevant lines in 2 files are covered.
• 16 unchanged lines in 7 files lost coverage.
• Overall coverage decreased (-0.3%) to 93.663%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pyod/test/test_devnet.py	82	83	98.8%
pyod/models/devnet.py	153	214	71.5%
<!--	Total:	235	297	79.12%	-->

Files with Coverage Reduction	New Missed Lines	%
pyod/test/test_dif.py	1	98.84%
pyod/models/deep_svdd.py	1	99.25%
pyod/test/test_auto_encoder.py	1	98.75%
pyod/test/test_torch_utility.py	1	99.16%
pyod/test/test_vae.py	2	97.5%
pyod/test/test_base_dl.py	3	96.64%
pyod/models/base_dl.py	7	94.93%
<!--	Total:	16		-->

Totals
Change from base Build 9457434073:	-0.3%
Covered Lines:	9577
Relevant Lines:	10225

---

💛 - Coveralls