{"action":"created","issue":{"url":"https://api.github.com/repos/JohnLangford/vowpal_wabbit/issues/1091","repository_url":"https://api.github.com/repos/JohnLangford/vowpal_wabbit","labels_url":"https://api.github.com/repos/JohnLangford/vowpal_wabbit/issues/1091/labels{/name}","comments_url":"https://api.github.com/repos/JohnLangford/vowpal_wabbit/issues/1091/comments","events_url":"https://api.github.com/repos/JohnLangford/vowpal_wabbit/issues/1091/events","html_url":"https://github.com/JohnLangford/vowpal_wabbit/issues/1091","id":172863597,"number":1091,"title":"What does vowpal assign as the costs of undefined label:cost pairs for a training instance in csoaa","user":{"login":"dhruvghulati","id":7677981,"avatar_url":"https://avatars.githubusercontent.com/u/7677981?v=3","gravatar_id":"","url":"https://api.github.com/users/dhruvghulati","html_url":"https://github.com/dhruvghulati","followers_url":"https://api.github.com/users/dhruvghulati/followers","following_url":"https://api.github.com/users/dhruvghulati/following{/other_user}","gists_url":"https://api.github.com/users/dhruvghulati/gists{/gist_id}","starred_url":"https://api.github.com/users/dhruvghulati/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dhruvghulati/subscriptions","organizations_url":"https://api.github.com/users/dhruvghulati/orgs","repos_url":"https://api.github.com/users/dhruvghulati/repos","events_url":"https://api.github.com/users/dhruvghulati/events{/privacy}","received_events_url":"https://api.github.com/users/dhruvghulati/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2016-08-24T04:46:57Z","updated_at":"2016-08-26T20:19:07Z","closed_at":null,"body":"I am curious what the underlying algorithm assigns as the cost for undefined label-cost pairs for a training instance (for example if I have 4 potential labels, but on each row I only put the cost for 1 label instead of all 4). i.e.:\r\n\r\n```\r\n3:0.04 instance1| the cat sat on mat\r\n2:0.01 instance2| location_slot united states\r\n```\r\n\r\nInstead of:\r\n\r\n```\r\n1:0.23 2:0.56 3:0.04 4:0.78 instance1| the cat sat on mat\r\n1:0.61 2:0.01 3:0.08 4:0.03 instance2| location_slot united states\r\n```\r\n\r\nAre the costs for every other label assigned as 1? infinity? `None`?\r\n"},"comment":{"url":"https://api.github.com/repos/JohnLangford/vowpal_wabbit/issues/comments/242840791","html_url":"https://github.com/JohnLangford/vowpal_wabbit/issues/1091#issuecomment-242840791","issue_url":"https://api.github.com/repos/JohnLangford/vowpal_wabbit/issues/1091","id":242840791,"user":{"login":"JohnLangford","id":79590,"avatar_url":"https://avatars.githubusercontent.com/u/79590?v=3","gravatar_id":"","url":"https://api.github.com/users/JohnLangford","html_url":"https://github.com/JohnLangford","followers_url":"https://api.github.com/users/JohnLangford/followers","following_url":"https://api.github.com/users/JohnLangford/following{/other_user}","gists_url":"https://api.github.com/users/JohnLangford/gists{/gist_id}","starred_url":"https://api.github.com/users/JohnLangford/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/JohnLangford/subscriptions","organizations_url":"https://api.github.com/users/JohnLangford/orgs","repos_url":"https://api.github.com/users/JohnLangford/repos","events_url":"https://api.github.com/users/JohnLangford/events{/privacy}","received_events_url":"https://api.github.com/users/JohnLangford/received_events","type":"User","site_admin":false},"created_at":"2016-08-26T20:19:07Z","updated_at":"2016-08-26T20:19:07Z","body":"None is more accurate.  Each entry corresponds to an update, and no update occurs if you do not specify an entry."}}
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