{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/48908602","id":48908602,"diff_hunk":"@@ -0,0 +1,272 @@\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.tree.impl\n+\n+import org.apache.spark.Logging\n+import org.apache.spark.mllib.impl.PeriodicRDDCheckpointer\n+import org.apache.spark.mllib.regression.LabeledPoint\n+import org.apache.spark.ml.regression.{DecisionTreeRegressionModel, DecisionTreeRegressor}\n+import org.apache.spark.mllib.tree.configuration.Algo._\n+import org.apache.spark.mllib.tree.configuration.BoostingStrategy","path":"mllib/src/main/scala/org/apache/spark/ml/tree/impl/GradientBoostedTrees.scala","position":25,"original_position":25,"commit_id":"b2490e95ec801b43cc2e3534945d6586e6da7bf3","original_commit_id":"b2490e95ec801b43cc2e3534945d6586e6da7bf3","user":{"login":"holdenk","id":59893,"avatar_url":"https://avatars.githubusercontent.com/u/59893?v=3","gravatar_id":"","url":"https://api.github.com/users/holdenk","html_url":"https://github.com/holdenk","followers_url":"https://api.github.com/users/holdenk/followers","following_url":"https://api.github.com/users/holdenk/following{/other_user}","gists_url":"https://api.github.com/users/holdenk/gists{/gist_id}","starred_url":"https://api.github.com/users/holdenk/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/holdenk/subscriptions","organizations_url":"https://api.github.com/users/holdenk/orgs","repos_url":"https://api.github.com/users/holdenk/repos","events_url":"https://api.github.com/users/holdenk/events{/privacy}","received_events_url":"https://api.github.com/users/holdenk/received_events","type":"User","site_admin":false},"body":"It seems elsewhere in the ML codebase we normally import these configurations as Old[x] to avoid confusion which might be a good idea here?","created_at":"2016-01-05T22:59:39Z","updated_at":"2016-01-05T22:59:39Z","html_url":"https://github.com/apache/spark/pull/10607#discussion_r48908602","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/10607","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/48908602"},"html":{"href":"https://github.com/apache/spark/pull/10607#discussion_r48908602"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/10607"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/10607","id":55153735,"html_url":"https://github.com/apache/spark/pull/10607","diff_url":"https://github.com/apache/spark/pull/10607.diff","patch_url":"https://github.com/apache/spark/pull/10607.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/10607","number":10607,"state":"open","locked":false,"title":"[SPARK-12379][ML][MLLIB] Copy GBT implementation to spark.ml","user":{"login":"sethah","id":7275795,"avatar_url":"https://avatars.githubusercontent.com/u/7275795?v=3","gravatar_id":"","url":"https://api.github.com/users/sethah","html_url":"https://github.com/sethah","followers_url":"https://api.github.com/users/sethah/followers","following_url":"https://api.github.com/users/sethah/following{/other_user}","gists_url":"https://api.github.com/users/sethah/gists{/gist_id}","starred_url":"https://api.github.com/users/sethah/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sethah/subscriptions","organizations_url":"https://api.github.com/users/sethah/orgs","repos_url":"https://api.github.com/users/sethah/repos","events_url":"https://api.github.com/users/sethah/events{/privacy}","received_events_url":"https://api.github.com/users/sethah/received_events","type":"User","site_admin":false},"body":"Currently, GBTs in spark.ml wrap the implementation in spark.mllib. This is preventing several improvements to GBTs in spark.ml, so we need to move the implementation to ml and use spark.ml decision trees in the implementation. At first, we should make minimal changes to the implementation.\r\nPerformance testing should be done to ensure there were no regressions.\r\n\r\nTODO: Ensure performance tests are sufficient to show no regressions.","created_at":"2016-01-05T22:42:18Z","updated_at":"2016-01-05T22:59:39Z","closed_at":null,"merged_at":null,"merge_commit_sha":"97f2c58ec74ce61876fb45eb86e4624724e5177c","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/10607/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/10607/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/10607/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/b2490e95ec801b43cc2e3534945d6586e6da7bf3","head":{"label":"sethah:SPARK-12379","ref":"SPARK-12379","sha":"b2490e95ec801b43cc2e3534945d6586e6da7bf3","user":{"login":"sethah","id":7275795,"avatar_url":"https://avatars.githubusercontent.com/u/7275795?v=3","gravatar_id":"","url":"https://api.github.com/users/sethah","html_url":"https://github.com/sethah","followers_url":"https://api.github.com/users/sethah/followers","following_url":"https://api.github.com/users/sethah/following{/other_user}","gists_url":"https://api.github.com/users/sethah/gists{/gist_id}","starred_url":"https://api.github.com/users/sethah/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sethah/subscriptions","organizations_url":"https://api.github.com/users/sethah/orgs","repos_url":"https://api.github.com/users/sethah/repos","events_url":"https://api.github.com/users/sethah/events{/privacy}","received_events_url":"https://api.github.com/users/sethah/received_events","type":"User","site_admin":false},"repo":{"id":38016887,"name":"spark","full_name":"sethah/spark","owner":{"login":"sethah","id":7275795,"avatar_url":"https://avatars.githubusercontent.com/u/7275795?v=3","gravatar_id":"","url":"https://api.github.com/users/sethah","html_url":"https://github.com/sethah","followers_url":"https://api.github.com/users/sethah/followers","following_url":"https://api.github.com/users/sethah/following{/other_user}","gists_url":"https://api.github.com/users/sethah/gists{/gist_id}","starred_url":"https://api.github.com/users/sethah/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sethah/subscriptions","organizations_url":"https://api.github.com/users/sethah/orgs","repos_url":"https://api.github.com/users/sethah/repos","events_url":"https://api.github.com/users/sethah/events{/privacy}","received_events_url":"https://api.github.com/users/sethah/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/sethah/spark","description":"Mirror 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