{"action":"created","issue":{"url":"https://api.github.com/repos/scipy/scipy/issues/5556","labels_url":"https://api.github.com/repos/scipy/scipy/issues/5556/labels{/name}","comments_url":"https://api.github.com/repos/scipy/scipy/issues/5556/comments","events_url":"https://api.github.com/repos/scipy/scipy/issues/5556/events","html_url":"https://github.com/scipy/scipy/pull/5556","id":119313538,"number":5556,"title":"BUG: Fixed broken dogbox trust-region radius update","user":{"login":"nmayorov","id":7074023,"avatar_url":"https://avatars.githubusercontent.com/u/7074023?v=3","gravatar_id":"","url":"https://api.github.com/users/nmayorov","html_url":"https://github.com/nmayorov","followers_url":"https://api.github.com/users/nmayorov/followers","following_url":"https://api.github.com/users/nmayorov/following{/other_user}","gists_url":"https://api.github.com/users/nmayorov/gists{/gist_id}","starred_url":"https://api.github.com/users/nmayorov/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nmayorov/subscriptions","organizations_url":"https://api.github.com/users/nmayorov/orgs","repos_url":"https://api.github.com/users/nmayorov/repos","events_url":"https://api.github.com/users/nmayorov/events{/privacy}","received_events_url":"https://api.github.com/users/nmayorov/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/scipy/scipy/labels/defect","name":"defect","color":"e11d21"},{"url":"https://api.github.com/repos/scipy/scipy/labels/scipy.optimize","name":"scipy.optimize","color":"207de5"}],"state":"open","locked":false,"assignee":null,"milestone":{"url":"https://api.github.com/repos/scipy/scipy/milestones/26","html_url":"https://github.com/scipy/scipy/milestones/0.17.0","labels_url":"https://api.github.com/repos/scipy/scipy/milestones/26/labels","id":1096839,"number":26,"title":"0.17.0","description":"","creator":{"login":"rgommers","id":98330,"avatar_url":"https://avatars.githubusercontent.com/u/98330?v=3","gravatar_id":"","url":"https://api.github.com/users/rgommers","html_url":"https://github.com/rgommers","followers_url":"https://api.github.com/users/rgommers/followers","following_url":"https://api.github.com/users/rgommers/following{/other_user}","gists_url":"https://api.github.com/users/rgommers/gists{/gist_id}","starred_url":"https://api.github.com/users/rgommers/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rgommers/subscriptions","organizations_url":"https://api.github.com/users/rgommers/orgs","repos_url":"https://api.github.com/users/rgommers/repos","events_url":"https://api.github.com/users/rgommers/events{/privacy}","received_events_url":"https://api.github.com/users/rgommers/received_events","type":"User","site_admin":false},"open_issues":15,"closed_issues":259,"state":"open","created_at":"2015-05-05T13:00:06Z","updated_at":"2015-11-28T19:53:44Z","due_on":"2015-11-29T23:00:00Z","closed_at":null},"comments":2,"created_at":"2015-11-28T19:12:32Z","updated_at":"2015-11-28T20:26:25Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/scipy/scipy/pulls/5556","html_url":"https://github.com/scipy/scipy/pull/5556","diff_url":"https://github.com/scipy/scipy/pull/5556.diff","patch_url":"https://github.com/scipy/scipy/pull/5556.patch"},"body":"I was solving some least-squares problems and bumped into quite a bug, which blocks dogbox solver progress.\r\n\r\nExplanation: if the trial step was unsuccessful than trust-region radius is updated as `Delta = 0.25 * step_h_norm`, but in dogbox trust regions are rectangular, thus `step_h_norm` must be computed with infinity norm, otherwise `Delta` may not shrink and we get into infinite loop. \r\n\r\nPlease merge this fix asap.\r\n"},"comment":{"url":"https://api.github.com/repos/scipy/scipy/issues/comments/160333762","html_url":"https://github.com/scipy/scipy/pull/5556#issuecomment-160333762","issue_url":"https://api.github.com/repos/scipy/scipy/issues/5556","id":160333762,"user":{"login":"nmayorov","id":7074023,"avatar_url":"https://avatars.githubusercontent.com/u/7074023?v=3","gravatar_id":"","url":"https://api.github.com/users/nmayorov","html_url":"https://github.com/nmayorov","followers_url":"https://api.github.com/users/nmayorov/followers","following_url":"https://api.github.com/users/nmayorov/following{/other_user}","gists_url":"https://api.github.com/users/nmayorov/gists{/gist_id}","starred_url":"https://api.github.com/users/nmayorov/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nmayorov/subscriptions","organizations_url":"https://api.github.com/users/nmayorov/orgs","repos_url":"https://api.github.com/users/nmayorov/repos","events_url":"https://api.github.com/users/nmayorov/events{/privacy}","received_events_url":"https://api.github.com/users/nmayorov/received_events","type":"User","site_admin":false},"created_at":"2015-11-28T20:26:25Z","updated_at":"2015-11-28T20:26:25Z","body":"Not very difficult, I can include one rather small problem. I guess you recommend me to do it)\r\n\r\nbtw: I hope to send a narrative documentation update for least squares in a few days. "}}