{"action":"opened","issue":{"url":"https://api.github.com/repos/scikit-learn/scikit-learn/issues/4132","labels_url":"https://api.github.com/repos/scikit-learn/scikit-learn/issues/4132/labels{/name}","comments_url":"https://api.github.com/repos/scikit-learn/scikit-learn/issues/4132/comments","events_url":"https://api.github.com/repos/scikit-learn/scikit-learn/issues/4132/events","html_url":"https://github.com/scikit-learn/scikit-learn/issues/4132","id":54945528,"number":4132,"title":"Signature of MDS fit","user":{"login":"amueller","id":449558,"avatar_url":"https://avatars.githubusercontent.com/u/449558?v=3","gravatar_id":"","url":"https://api.github.com/users/amueller","html_url":"https://github.com/amueller","followers_url":"https://api.github.com/users/amueller/followers","following_url":"https://api.github.com/users/amueller/following{/other_user}","gists_url":"https://api.github.com/users/amueller/gists{/gist_id}","starred_url":"https://api.github.com/users/amueller/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/amueller/subscriptions","organizations_url":"https://api.github.com/users/amueller/orgs","repos_url":"https://api.github.com/users/amueller/repos","events_url":"https://api.github.com/users/amueller/events{/privacy}","received_events_url":"https://api.github.com/users/amueller/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/scikit-learn/scikit-learn/labels/API","name":"API","color":"bfd4f2"}],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-01-20T21:53:00Z","updated_at":"2015-01-20T21:53:00Z","closed_at":null,"body":"The signature of ``MDS`` is\r\n```fit_transform(self, X, init=None, y=None)```\r\nwhich messes a bit with pipelines and automatic testing.\r\n\r\nPipelines assume that the second parameter to fit is ``y``. As ``MDS`` doesn't have a``transform``, I guess it is useless with pipelines anyhow.\r\nStill that seems to be a slightly tricky issue, which might come up again in the future."}}