{"action":"created","issue":{"url":"https://api.github.com/repos/apache/spark/issues/4709","labels_url":"https://api.github.com/repos/apache/spark/issues/4709/labels{/name}","comments_url":"https://api.github.com/repos/apache/spark/issues/4709/comments","events_url":"https://api.github.com/repos/apache/spark/issues/4709/events","html_url":"https://github.com/apache/spark/pull/4709","id":58426347,"number":4709,"title":"[MLLIB] SPARK-5912 Programming guide for feature selection","user":{"login":"avulanov","id":939524,"avatar_url":"https://avatars.githubusercontent.com/u/939524?v=3","gravatar_id":"","url":"https://api.github.com/users/avulanov","html_url":"https://github.com/avulanov","followers_url":"https://api.github.com/users/avulanov/followers","following_url":"https://api.github.com/users/avulanov/following{/other_user}","gists_url":"https://api.github.com/users/avulanov/gists{/gist_id}","starred_url":"https://api.github.com/users/avulanov/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/avulanov/subscriptions","organizations_url":"https://api.github.com/users/avulanov/orgs","repos_url":"https://api.github.com/users/avulanov/repos","events_url":"https://api.github.com/users/avulanov/events{/privacy}","received_events_url":"https://api.github.com/users/avulanov/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":18,"created_at":"2015-02-20T23:44:15Z","updated_at":"2015-02-23T20:38:05Z","closed_at":"2015-02-23T20:11:31Z","pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/4709","html_url":"https://github.com/apache/spark/pull/4709","diff_url":"https://github.com/apache/spark/pull/4709.diff","patch_url":"https://github.com/apache/spark/pull/4709.patch"},"body":"Added description of ChiSqSelector and few words about feature selection in general. I could add a code example, however it would not look reasonable in the absence of feature discretizer or a dataset in the `data` folder that has redundant features."},"comment":{"url":"https://api.github.com/repos/apache/spark/issues/comments/75626645","html_url":"https://github.com/apache/spark/pull/4709#issuecomment-75626645","issue_url":"https://api.github.com/repos/apache/spark/issues/4709","id":75626645,"user":{"login":"SparkQA","id":8108735,"avatar_url":"https://avatars.githubusercontent.com/u/8108735?v=3","gravatar_id":"","url":"https://api.github.com/users/SparkQA","html_url":"https://github.com/SparkQA","followers_url":"https://api.github.com/users/SparkQA/followers","following_url":"https://api.github.com/users/SparkQA/following{/other_user}","gists_url":"https://api.github.com/users/SparkQA/gists{/gist_id}","starred_url":"https://api.github.com/users/SparkQA/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/SparkQA/subscriptions","organizations_url":"https://api.github.com/users/SparkQA/orgs","repos_url":"https://api.github.com/users/SparkQA/repos","events_url":"https://api.github.com/users/SparkQA/events{/privacy}","received_events_url":"https://api.github.com/users/SparkQA/received_events","type":"User","site_admin":false},"created_at":"2015-02-23T20:38:05Z","updated_at":"2015-02-23T20:38:05Z","body":"  [Test build #27860 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/27860/consoleFull) for   PR 4709 at commit [`19a8a4e`](https://github.com/apache/spark/commit/19a8a4e9b8c3b5607c87fb1eae19810f90b9ad6a).\n * This patch **passes all tests**.\n * This patch merges cleanly.\n * This patch adds the following public classes _(experimental)_:\n  * `ChiSqSelector stands for Chi-Squared feature selection. It operates on the labeled data. ChiSqSelector orders categorical features based on their values of Chi-Squared test on independence from class and filters (selects) top given features.  `\n"}}