{"action":"created","issue":{"url":"https://api.github.com/repos/liboyin/horc/issues/1","labels_url":"https://api.github.com/repos/liboyin/horc/issues/1/labels{/name}","comments_url":"https://api.github.com/repos/liboyin/horc/issues/1/comments","events_url":"https://api.github.com/repos/liboyin/horc/issues/1/events","html_url":"https://github.com/liboyin/horc/issues/1","id":69911766,"number":1,"title":"On what level do SIFT descriptors cluster?","user":{"login":"liboyin","id":2116968,"avatar_url":"https://avatars.githubusercontent.com/u/2116968?v=3","gravatar_id":"","url":"https://api.github.com/users/liboyin","html_url":"https://github.com/liboyin","followers_url":"https://api.github.com/users/liboyin/followers","following_url":"https://api.github.com/users/liboyin/following{/other_user}","gists_url":"https://api.github.com/users/liboyin/gists{/gist_id}","starred_url":"https://api.github.com/users/liboyin/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/liboyin/subscriptions","organizations_url":"https://api.github.com/users/liboyin/orgs","repos_url":"https://api.github.com/users/liboyin/repos","events_url":"https://api.github.com/users/liboyin/events{/privacy}","received_events_url":"https://api.github.com/users/liboyin/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/liboyin/horc/labels/enhancement","name":"enhancement","color":"84b6eb"}],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":2,"created_at":"2015-04-21T17:56:15Z","updated_at":"2015-04-28T15:01:33Z","closed_at":null,"body":"SIFT descriptors from visual features that look similar should naturally cluster. It remains to be seen whether SIFT descriptors from the same class would cluster. This hypothesis should be tested by comparing the within-class variance and between-class variance. Also, to see how strongly do SIFT descriptors cluster, we should try to plot the distance from each query descriptor to all training descriptors."},"comment":{"url":"https://api.github.com/repos/liboyin/horc/issues/comments/97096010","html_url":"https://github.com/liboyin/horc/issues/1#issuecomment-97096010","issue_url":"https://api.github.com/repos/liboyin/horc/issues/1","id":97096010,"user":{"login":"liboyin","id":2116968,"avatar_url":"https://avatars.githubusercontent.com/u/2116968?v=3","gravatar_id":"","url":"https://api.github.com/users/liboyin","html_url":"https://github.com/liboyin","followers_url":"https://api.github.com/users/liboyin/followers","following_url":"https://api.github.com/users/liboyin/following{/other_user}","gists_url":"https://api.github.com/users/liboyin/gists{/gist_id}","starred_url":"https://api.github.com/users/liboyin/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/liboyin/subscriptions","organizations_url":"https://api.github.com/users/liboyin/orgs","repos_url":"https://api.github.com/users/liboyin/repos","events_url":"https://api.github.com/users/liboyin/events{/privacy}","received_events_url":"https://api.github.com/users/liboyin/received_events","type":"User","site_admin":false},"created_at":"2015-04-28T15:01:33Z","updated_at":"2015-04-28T15:01:33Z","body":"In other words:\r\n\r\n1. How separable are all SIFT feature descriptors? (between-descriptors)\r\n2. How separable are classes? (between-classes & within-class)\r\n\r\nand for the kNN/sNN model:\r\n\r\n1. For one test SIFT descriptor from a test image, how separable are classes?\r\n2. For all test SIFT descriptors from a test image, how separable are classes?"}}