{"action":"created","issue":{"url":"https://api.github.com/repos/opencv/opencv_contrib/issues/490","repository_url":"https://api.github.com/repos/opencv/opencv_contrib","labels_url":"https://api.github.com/repos/opencv/opencv_contrib/issues/490/labels{/name}","comments_url":"https://api.github.com/repos/opencv/opencv_contrib/issues/490/comments","events_url":"https://api.github.com/repos/opencv/opencv_contrib/issues/490/events","html_url":"https://github.com/opencv/opencv_contrib/issues/490","id":123866379,"number":490,"title":"dnn forward calculation is much slower than caffe original version","user":{"login":"shengxingdong","id":16410579,"avatar_url":"https://avatars.githubusercontent.com/u/16410579?v=3","gravatar_id":"","url":"https://api.github.com/users/shengxingdong","html_url":"https://github.com/shengxingdong","followers_url":"https://api.github.com/users/shengxingdong/followers","following_url":"https://api.github.com/users/shengxingdong/following{/other_user}","gists_url":"https://api.github.com/users/shengxingdong/gists{/gist_id}","starred_url":"https://api.github.com/users/shengxingdong/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/shengxingdong/subscriptions","organizations_url":"https://api.github.com/users/shengxingdong/orgs","repos_url":"https://api.github.com/users/shengxingdong/repos","events_url":"https://api.github.com/users/shengxingdong/events{/privacy}","received_events_url":"https://api.github.com/users/shengxingdong/received_events","type":"User","site_admin":false},"labels":[{"id":271951382,"url":"https://api.github.com/repos/opencv/opencv_contrib/labels/category:%20dnn","name":"category: dnn","color":"ededed","default":false},{"id":55956596,"url":"https://api.github.com/repos/opencv/opencv_contrib/labels/feature","name":"feature","color":"84b6eb","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":10,"created_at":"2015-12-25T09:02:18Z","updated_at":"2016-12-01T01:58:30Z","closed_at":null,"body":"when running VGG_ILSVRC_16_layers model, it takes more than 10 seconds, much slower than caffe original version. Both use cpu only.\n"},"comment":{"url":"https://api.github.com/repos/opencv/opencv_contrib/issues/comments/264056249","html_url":"https://github.com/opencv/opencv_contrib/issues/490#issuecomment-264056249","issue_url":"https://api.github.com/repos/opencv/opencv_contrib/issues/490","id":264056249,"user":{"login":"shengxingdong","id":16410579,"avatar_url":"https://avatars.githubusercontent.com/u/16410579?v=3","gravatar_id":"","url":"https://api.github.com/users/shengxingdong","html_url":"https://github.com/shengxingdong","followers_url":"https://api.github.com/users/shengxingdong/followers","following_url":"https://api.github.com/users/shengxingdong/following{/other_user}","gists_url":"https://api.github.com/users/shengxingdong/gists{/gist_id}","starred_url":"https://api.github.com/users/shengxingdong/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/shengxingdong/subscriptions","organizations_url":"https://api.github.com/users/shengxingdong/orgs","repos_url":"https://api.github.com/users/shengxingdong/repos","events_url":"https://api.github.com/users/shengxingdong/events{/privacy}","received_events_url":"https://api.github.com/users/shengxingdong/received_events","type":"User","site_admin":false},"created_at":"2016-12-01T01:58:30Z","updated_at":"2016-12-01T01:58:30Z","body":"@pi-null-mezon , as @ludv1x said, the bottleneck is cv::gemm.  You can replace cv::gemm with cblas_sgemm as @xmchen1987 did."}}
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