{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/33078042","id":33078042,"diff_hunk":"@@ -0,0 +1,88 @@\n+/*\n+ * Licensed to the Apache Software Foundation (ASF) under one or more\n+ * contributor license agreements.  See the NOTICE file distributed with\n+ * this work for additional information regarding copyright ownership.\n+ * The ASF licenses this file to You under the Apache License, Version 2.0\n+ * (the \"License\"); you may not use this file except in compliance with\n+ * the License.  You may obtain a copy of the License at\n+ *\n+ *    http://www.apache.org/licenses/LICENSE-2.0\n+ *\n+ * Unless required by applicable law or agreed to in writing, software\n+ * distributed under the License is distributed on an \"AS IS\" BASIS,\n+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n+ * See the License for the specific language governing permissions and\n+ * limitations under the License.\n+ */\n+\n+package org.apache.spark.ml.feature\n+\n+import edu.emory.mathcs.jtransforms.dct._\n+\n+import org.apache.spark.annotation.Experimental\n+import org.apache.spark.ml.UnaryTransformer\n+import org.apache.spark.ml.param.BooleanParam\n+import org.apache.spark.ml.util.Identifiable\n+import org.apache.spark.sql.types.{NumericType, ArrayType, DataType, DoubleType}\n+\n+/**\n+ * :: Experimental ::\n+ * A feature transformer that takes the 1D discrete cosine transform of a real vector.\n+ * It returns a real vector of the same length representing the DCT. The return vector is scaled\n+ * such that the transform matrix is unitary.\n+ *\n+ * More information: https://en.wikipedia.org/wiki/Discrete_cosine_transform#DCT-II","path":"mllib/src/main/scala/org/apache/spark/ml/feature/DiscreteCosineTransformer.scala","position":34,"original_position":34,"commit_id":"530983ab569e479dd0a4dd746b6520380496c80d","original_commit_id":"530983ab569e479dd0a4dd746b6520380496c80d","user":{"login":"jkbradley","id":5084283,"avatar_url":"https://avatars.githubusercontent.com/u/5084283?v=3","gravatar_id":"","url":"https://api.github.com/users/jkbradley","html_url":"https://github.com/jkbradley","followers_url":"https://api.github.com/users/jkbradley/followers","following_url":"https://api.github.com/users/jkbradley/following{/other_user}","gists_url":"https://api.github.com/users/jkbradley/gists{/gist_id}","starred_url":"https://api.github.com/users/jkbradley/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jkbradley/subscriptions","organizations_url":"https://api.github.com/users/jkbradley/orgs","repos_url":"https://api.github.com/users/jkbradley/repos","events_url":"https://api.github.com/users/jkbradley/events{/privacy}","received_events_url":"https://api.github.com/users/jkbradley/received_events","type":"User","site_admin":false},"body":"Use double-brackets around link + text following:\r\n```\r\nMore information on [[https://en.wikipedia.org/wiki/Discrete_cosine_transform#DCT-II  Wikipedia]]\r\n```","created_at":"2015-06-23T18:56:51Z","updated_at":"2015-06-23T18:56:51Z","html_url":"https://github.com/apache/spark/pull/6894#discussion_r33078042","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/6894","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/33078042"},"html":{"href":"https://github.com/apache/spark/pull/6894#discussion_r33078042"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/6894"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/6894","id":38072579,"html_url":"https://github.com/apache/spark/pull/6894","diff_url":"https://github.com/apache/spark/pull/6894.diff","patch_url":"https://github.com/apache/spark/pull/6894.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/6894","number":6894,"state":"open","locked":false,"title":"[SPARK-8471][ML] Discrete Cosine Transform Feature Transformer","user":{"login":"feynmanliang","id":990069,"avatar_url":"https://avatars.githubusercontent.com/u/990069?v=3","gravatar_id":"","url":"https://api.github.com/users/feynmanliang","html_url":"https://github.com/feynmanliang","followers_url":"https://api.github.com/users/feynmanliang/followers","following_url":"https://api.github.com/users/feynmanliang/following{/other_user}","gists_url":"https://api.github.com/users/feynmanliang/gists{/gist_id}","starred_url":"https://api.github.com/users/feynmanliang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/feynmanliang/subscriptions","organizations_url":"https://api.github.com/users/feynmanliang/orgs","repos_url":"https://api.github.com/users/feynmanliang/repos","events_url":"https://api.github.com/users/feynmanliang/events{/privacy}","received_events_url":"https://api.github.com/users/feynmanliang/received_events","type":"User","site_admin":false},"body":"Implementation and tests for Discrete Cosine Transformer.\r\n\r\nTODO:\r\n * Handle arbitrary numeric data type\r\n * Handle 2D and 3D tensors","created_at":"2015-06-19T02:43:14Z","updated_at":"2015-06-23T18:56:51Z","closed_at":null,"merged_at":null,"merge_commit_sha":"110410f61d741d3939201bc44b3b017373d30b91","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/6894/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/6894/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/6894/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/530983ab569e479dd0a4dd746b6520380496c80d","head":{"label":"feynmanliang:dct-features","ref":"dct-features","sha":"530983ab569e479dd0a4dd746b6520380496c80d","user":{"login":"feynmanliang","id":990069,"avatar_url":"https://avatars.githubusercontent.com/u/990069?v=3","gravatar_id":"","url":"https://api.github.com/users/feynmanliang","html_url":"https://github.com/feynmanliang","followers_url":"https://api.github.com/users/feynmanliang/followers","following_url":"https://api.github.com/users/feynmanliang/following{/other_user}","gists_url":"https://api.github.com/users/feynmanliang/gists{/gist_id}","starred_url":"https://api.github.com/users/feynmanliang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/feynmanliang/subscriptions","organizations_url":"https://api.github.com/users/feynmanliang/orgs","repos_url":"https://api.github.com/users/feynmanliang/repos","events_url":"https://api.github.com/users/feynmanliang/events{/privacy}","received_events_url":"https://api.github.com/users/feynmanliang/received_events","type":"User","site_admin":false},"repo":{"id":31143142,"name":"spark","full_name":"feynmanliang/spark","owner":{"login":"feynmanliang","id":990069,"avatar_url":"https://avatars.githubusercontent.com/u/990069?v=3","gravatar_id":"","url":"https://api.github.com/users/feynmanliang","html_url":"https://github.com/feynmanliang","followers_url":"https://api.github.com/users/feynmanliang/followers","following_url":"https://api.github.com/users/feynmanliang/following{/other_user}","gists_url":"https://api.github.com/users/feynmanliang/gists{/gist_id}","starred_url":"https://api.github.com/users/feynmanliang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/feynmanliang/subscriptions","organizations_url":"https://api.github.com/users/feynmanliang/orgs","repos_url":"https://api.github.com/users/feynmanliang/repos","events_url":"https://api.github.com/users/feynmanliang/events{/privacy}","received_events_url":"https://api.github.com/users/feynmanliang/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/feynmanliang/spark","description":"Mirror 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