{"action":"created","issue":{"url":"https://api.github.com/repos/apache/incubator-systemml/issues/186","repository_url":"https://api.github.com/repos/apache/incubator-systemml","labels_url":"https://api.github.com/repos/apache/incubator-systemml/issues/186/labels{/name}","comments_url":"https://api.github.com/repos/apache/incubator-systemml/issues/186/comments","events_url":"https://api.github.com/repos/apache/incubator-systemml/issues/186/events","html_url":"https://github.com/apache/incubator-systemml/pull/186","id":163974040,"number":186,"title":"[SYSTEMML-774][WIP] sparse matrix concurrency fix","user":{"login":"nakul02","id":5394361,"avatar_url":"https://avatars.githubusercontent.com/u/5394361?v=3","gravatar_id":"","url":"https://api.github.com/users/nakul02","html_url":"https://github.com/nakul02","followers_url":"https://api.github.com/users/nakul02/followers","following_url":"https://api.github.com/users/nakul02/following{/other_user}","gists_url":"https://api.github.com/users/nakul02/gists{/gist_id}","starred_url":"https://api.github.com/users/nakul02/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nakul02/subscriptions","organizations_url":"https://api.github.com/users/nakul02/orgs","repos_url":"https://api.github.com/users/nakul02/repos","events_url":"https://api.github.com/users/nakul02/events{/privacy}","received_events_url":"https://api.github.com/users/nakul02/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":6,"created_at":"2016-07-06T00:19:09Z","updated_at":"2016-07-07T19:08:16Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/apache/incubator-systemml/pulls/186","html_url":"https://github.com/apache/incubator-systemml/pull/186","diff_url":"https://github.com/apache/incubator-systemml/pull/186.diff","patch_url":"https://github.com/apache/incubator-systemml/pull/186.patch"},"body":"Added checks threadSafe implementation of MatrixBlock in operations.\r\n@mboehm7 - could you please take a look at these additions?"},"comment":{"url":"https://api.github.com/repos/apache/incubator-systemml/issues/comments/231177024","html_url":"https://github.com/apache/incubator-systemml/pull/186#issuecomment-231177024","issue_url":"https://api.github.com/repos/apache/incubator-systemml/issues/186","id":231177024,"user":{"login":"mboehm7","id":13721609,"avatar_url":"https://avatars.githubusercontent.com/u/13721609?v=3","gravatar_id":"","url":"https://api.github.com/users/mboehm7","html_url":"https://github.com/mboehm7","followers_url":"https://api.github.com/users/mboehm7/followers","following_url":"https://api.github.com/users/mboehm7/following{/other_user}","gists_url":"https://api.github.com/users/mboehm7/gists{/gist_id}","starred_url":"https://api.github.com/users/mboehm7/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mboehm7/subscriptions","organizations_url":"https://api.github.com/users/mboehm7/orgs","repos_url":"https://api.github.com/users/mboehm7/repos","events_url":"https://api.github.com/users/mboehm7/events{/privacy}","received_events_url":"https://api.github.com/users/mboehm7/received_events","type":"User","site_admin":false},"created_at":"2016-07-07T19:08:16Z","updated_at":"2016-07-07T19:08:16Z","body":"that's a great catch @nakul02 - we should fix the sparsity condition in matrixMultPermute(..., int k). \r\n\r\nThe reason why it never showed up so far is that we primarily compile these pmm operators in MR/Spark to avoid materializing diag(v) and there pmm is always executed as single-threaded block operations. However, there are potential corner cases where after recompile pmm is pushed into CP and hence we should fix that asap. Thanks."}}
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