{"action":"opened","issue":{"url":"https://api.github.com/repos/drphilmarshall/SpaceWarps/issues/146","labels_url":"https://api.github.com/repos/drphilmarshall/SpaceWarps/issues/146/labels{/name}","comments_url":"https://api.github.com/repos/drphilmarshall/SpaceWarps/issues/146/comments","events_url":"https://api.github.com/repos/drphilmarshall/SpaceWarps/issues/146/events","html_url":"https://github.com/drphilmarshall/SpaceWarps/issues/146","id":69617266,"number":146,"title":"Why 0.95?","user":{"login":"chrislintott","id":423607,"avatar_url":"https://avatars.githubusercontent.com/u/423607?v=3","gravatar_id":"","url":"https://api.github.com/users/chrislintott","html_url":"https://github.com/chrislintott","followers_url":"https://api.github.com/users/chrislintott/followers","following_url":"https://api.github.com/users/chrislintott/following{/other_user}","gists_url":"https://api.github.com/users/chrislintott/gists{/gist_id}","starred_url":"https://api.github.com/users/chrislintott/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/chrislintott/subscriptions","organizations_url":"https://api.github.com/users/chrislintott/orgs","repos_url":"https://api.github.com/users/chrislintott/repos","events_url":"https://api.github.com/users/chrislintott/events{/privacy}","received_events_url":"https://api.github.com/users/chrislintott/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-04-20T15:46:49Z","updated_at":"2015-04-20T15:46:49Z","closed_at":null,"body":"One of the major questions I have about Paper 1 is the choice of 0.95 for the threshold for accepting a lens. This seems somewhat arbitrary to me, and is never really discussed. It seems a bit odd to bring it up given that it clearly works well, but if it's essentially a free parameter then it would be good to discuss it for future reference. \r\n\r\nI suspect this is linked to another issue I have, which is that it seems unusual in figure 6 that few subjects get 'stuck' in the middle, which is very different to the behaviour we've seen in other projects (e.g. Galaxy Zoo, though that lacked training images) where many subjects can be said to be very unlikely to reach either threshold. Is it perhaps the case that lenses aren't ambiguous for the most part, and thus whatever threshold you pick will be reached by most real lenses anyway? \r\n\r\nIn any case, I think a few lines discussing this will help. "}}