{"action":"created","issue":{"url":"https://api.github.com/repos/scikit-learn/scikit-learn/issues/7910","repository_url":"https://api.github.com/repos/scikit-learn/scikit-learn","labels_url":"https://api.github.com/repos/scikit-learn/scikit-learn/issues/7910/labels{/name}","comments_url":"https://api.github.com/repos/scikit-learn/scikit-learn/issues/7910/comments","events_url":"https://api.github.com/repos/scikit-learn/scikit-learn/issues/7910/events","html_url":"https://github.com/scikit-learn/scikit-learn/pull/7910","id":190507094,"number":7910,"title":"[MRG] Support Vector Data Description","user":{"login":"ivannz","id":2227377,"avatar_url":"https://avatars.githubusercontent.com/u/2227377?v=3","gravatar_id":"","url":"https://api.github.com/users/ivannz","html_url":"https://github.com/ivannz","followers_url":"https://api.github.com/users/ivannz/followers","following_url":"https://api.github.com/users/ivannz/following{/other_user}","gists_url":"https://api.github.com/users/ivannz/gists{/gist_id}","starred_url":"https://api.github.com/users/ivannz/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ivannz/subscriptions","organizations_url":"https://api.github.com/users/ivannz/orgs","repos_url":"https://api.github.com/users/ivannz/repos","events_url":"https://api.github.com/users/ivannz/events{/privacy}","received_events_url":"https://api.github.com/users/ivannz/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":16,"created_at":"2016-11-19T17:02:42Z","updated_at":"2016-11-28T08:13:57Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/scikit-learn/scikit-learn/pulls/7910","html_url":"https://github.com/scikit-learn/scikit-learn/pull/7910","diff_url":"https://github.com/scikit-learn/scikit-learn/pull/7910.diff","patch_url":"https://github.com/scikit-learn/scikit-learn/pull/7910.patch"},"body":"<!--\r\nThanks for contributing a pull request! Please ensure you have taken a look at\r\nthe contribution guidelines: https://github.com/scikit-learn/scikit-learn/blob/master/CONTRIBUTING.md#Contributing-Pull-Requests\r\n-->\r\n#### Reference Issue\r\nThis PR covers previous issues concerning SVDD:\r\n* the original unfinished PR #3201 which is now very outdated;\r\n* Issue #2807 requesting SVDD to be added to Scikit;\r\n* PR #5899 which attempted to revive PR #3201 but was closed;\r\n* Unfinished PR #3013 which tried to modify the libsvm part only.\r\n\r\n#### What does this implement/fix? Explain your changes.\r\nThis PR offers the following:\r\n* SVDD-L1 implementation based on this [libsvm implementation](http://www.csie.ntu.edu.tw/~cjlin/libsvmtools/#libsvm_for_svdd_and_finding_the_smallest_sphere_containing_all_data). The model was extended to the case of a penalty cost vector (in line with other implemented support vector models in Scikit);\r\n* documentation, outlining the SVDD-L1 model;\r\n* an example showing a difference between the One-Class SVM and SVDD models.\r\n\r\n#### Any other comments?\r\nThe original model was proposed by Tax and Duin (2004), and later reformulated by Chang, Lee, Lin (2013). This PR implements the latter reformulation and extends it to the case of different weights of the observations. I can provide proof of the key theorems if necessary.\r\n\r\n<!--\r\nPlease be aware that we are a loose team of volunteers so patience is\r\nnecessary; assistance handling other issues is very welcome. We value\r\nall user contributions, no matter how minor they are. If we are slow to\r\nreview, either the pull request needs some benchmarking, tinkering,\r\nconvincing, etc. or more likely the reviewers are simply busy. In either\r\ncase, we ask for your understanding during the review process.\r\nFor more information, see our FAQ on this topic:\r\nhttp://scikit-learn.org/dev/faq.html#why-is-my-pull-request-not-getting-any-attention.\r\n\r\nThanks for contributing!\r\n-->\r\n"},"comment":{"url":"https://api.github.com/repos/scikit-learn/scikit-learn/issues/comments/263208044","html_url":"https://github.com/scikit-learn/scikit-learn/pull/7910#issuecomment-263208044","issue_url":"https://api.github.com/repos/scikit-learn/scikit-learn/issues/7910","id":263208044,"user":{"login":"ivannz","id":2227377,"avatar_url":"https://avatars.githubusercontent.com/u/2227377?v=3","gravatar_id":"","url":"https://api.github.com/users/ivannz","html_url":"https://github.com/ivannz","followers_url":"https://api.github.com/users/ivannz/followers","following_url":"https://api.github.com/users/ivannz/following{/other_user}","gists_url":"https://api.github.com/users/ivannz/gists{/gist_id}","starred_url":"https://api.github.com/users/ivannz/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ivannz/subscriptions","organizations_url":"https://api.github.com/users/ivannz/orgs","repos_url":"https://api.github.com/users/ivannz/repos","events_url":"https://api.github.com/users/ivannz/events{/privacy}","received_events_url":"https://api.github.com/users/ivannz/received_events","type":"User","site_admin":false},"created_at":"2016-11-28T08:13:57Z","updated_at":"2016-11-28T08:13:57Z","body":"@nelson-liu , @amueller , do you have any remarks/suggestions regarding the description of One-Class SCM and SVDD?"}}
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