{"action":"created","issue":{"url":"https://api.github.com/repos/dmlc/xgboost/issues/1395","repository_url":"https://api.github.com/repos/dmlc/xgboost","labels_url":"https://api.github.com/repos/dmlc/xgboost/issues/1395/labels{/name}","comments_url":"https://api.github.com/repos/dmlc/xgboost/issues/1395/comments","events_url":"https://api.github.com/repos/dmlc/xgboost/issues/1395/events","html_url":"https://github.com/dmlc/xgboost/issues/1395","id":167150606,"number":1395,"title":"Got worse result with the  latest model","user":{"login":"davutpolat","id":8608356,"avatar_url":"https://avatars.githubusercontent.com/u/8608356?v=3","gravatar_id":"","url":"https://api.github.com/users/davutpolat","html_url":"https://github.com/davutpolat","followers_url":"https://api.github.com/users/davutpolat/followers","following_url":"https://api.github.com/users/davutpolat/following{/other_user}","gists_url":"https://api.github.com/users/davutpolat/gists{/gist_id}","starred_url":"https://api.github.com/users/davutpolat/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/davutpolat/subscriptions","organizations_url":"https://api.github.com/users/davutpolat/orgs","repos_url":"https://api.github.com/users/davutpolat/repos","events_url":"https://api.github.com/users/davutpolat/events{/privacy}","received_events_url":"https://api.github.com/users/davutpolat/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2016-07-22T23:22:49Z","updated_at":"2016-07-23T10:13:09Z","closed_at":null,"body":"Hi,\r\n\r\ni just updated xgboost with latest one, ( my older version installed about 8 months ago) and i got worse result on same dataset ( objective is  reg:linear, tree_method=exact, oldest version does not support tree_method parameter).   anyone knows why  ? "},"comment":{"url":"https://api.github.com/repos/dmlc/xgboost/issues/comments/234710795","html_url":"https://github.com/dmlc/xgboost/issues/1395#issuecomment-234710795","issue_url":"https://api.github.com/repos/dmlc/xgboost/issues/1395","id":234710795,"user":{"login":"Laurae2","id":9083669,"avatar_url":"https://avatars.githubusercontent.com/u/9083669?v=3","gravatar_id":"","url":"https://api.github.com/users/Laurae2","html_url":"https://github.com/Laurae2","followers_url":"https://api.github.com/users/Laurae2/followers","following_url":"https://api.github.com/users/Laurae2/following{/other_user}","gists_url":"https://api.github.com/users/Laurae2/gists{/gist_id}","starred_url":"https://api.github.com/users/Laurae2/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Laurae2/subscriptions","organizations_url":"https://api.github.com/users/Laurae2/orgs","repos_url":"https://api.github.com/users/Laurae2/repos","events_url":"https://api.github.com/users/Laurae2/events{/privacy}","received_events_url":"https://api.github.com/users/Laurae2/received_events","type":"User","site_admin":false},"created_at":"2016-07-23T10:13:09Z","updated_at":"2016-07-23T10:13:09Z","body":"Check whether the NA values are the same. 8 months ago, NA values were 0 when creating the xgb.DMatrix type, while it is now NA for NA. Check also whether you are using the same initial seed (in case).\r\n\r\nDo you have a reproducible example? You can use verbose=2 when training XGBoost to print the tree/node count at each iteration. There, if you have a divergence straight at the beginning with the same exact parameters, it is likely the NA handling (old => 0 for NA, new => NA for NA) or a major/minor change in the splitting criterion in XGBoost."}}
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