Return-Path: X-Original-To: apmail-spark-commits-archive@minotaur.apache.org Delivered-To: apmail-spark-commits-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id A796D1764B for ; Fri, 13 Mar 2015 17:27:31 +0000 (UTC) Received: (qmail 79974 invoked by uid 500); 13 Mar 2015 17:27:31 -0000 Delivered-To: apmail-spark-commits-archive@spark.apache.org Received: (qmail 79943 invoked by uid 500); 13 Mar 2015 17:27:31 -0000 Mailing-List: contact commits-help@spark.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Delivered-To: mailing list commits@spark.apache.org Received: (qmail 79934 invoked by uid 99); 13 Mar 2015 17:27:31 -0000 Received: from git1-us-west.apache.org (HELO git1-us-west.apache.org) (140.211.11.23) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 13 Mar 2015 17:27:31 +0000 Received: by git1-us-west.apache.org (ASF Mail Server at git1-us-west.apache.org, from userid 33) id 308D7E1122; Fri, 13 Mar 2015 17:27:31 +0000 (UTC) Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: meng@apache.org To: commits@spark.apache.org Message-Id: <3b3439f686b9458e87ced2d067823cf3@git.apache.org> X-Mailer: ASF-Git Admin Mailer Subject: spark git commit: [SPARK-6278][MLLIB] Mention the change of objective in linear regression Date: Fri, 13 Mar 2015 17:27:31 +0000 (UTC) Repository: spark Updated Branches: refs/heads/master dc4abd4dc -> 7f13434a5 [SPARK-6278][MLLIB] Mention the change of objective in linear regression As discussed in the RC3 vote thread, we should mention the change of objective in linear regression in the migration guide. srowen Author: Xiangrui Meng Closes #4978 from mengxr/SPARK-6278 and squashes the following commits: fb3bbe6 [Xiangrui Meng] mention regularization parameter bfd6cff [Xiangrui Meng] Merge remote-tracking branch 'apache/master' into SPARK-6278 375fd09 [Xiangrui Meng] address Sean's comments f87ae71 [Xiangrui Meng] mention step size change Project: http://git-wip-us.apache.org/repos/asf/spark/repo Commit: http://git-wip-us.apache.org/repos/asf/spark/commit/7f13434a Tree: http://git-wip-us.apache.org/repos/asf/spark/tree/7f13434a Diff: http://git-wip-us.apache.org/repos/asf/spark/diff/7f13434a Branch: refs/heads/master Commit: 7f13434a5c52b815c584ec773ab0e5df1a35ea86 Parents: dc4abd4 Author: Xiangrui Meng Authored: Fri Mar 13 10:27:28 2015 -0700 Committer: Xiangrui Meng Committed: Fri Mar 13 10:27:28 2015 -0700 ---------------------------------------------------------------------- docs/mllib-guide.md | 2 ++ 1 file changed, 2 insertions(+) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/spark/blob/7f13434a/docs/mllib-guide.md ---------------------------------------------------------------------- diff --git a/docs/mllib-guide.md b/docs/mllib-guide.md index 598374f..f8e8794 100644 --- a/docs/mllib-guide.md +++ b/docs/mllib-guide.md @@ -102,6 +102,8 @@ In the `spark.mllib` package, there were several breaking changes. The first ch * In `DecisionTree`, the deprecated class method `train` has been removed. (The object/static `train` methods remain.) * In `Strategy`, the `checkpointDir` parameter has been removed. Checkpointing is still supported, but the checkpoint directory must be set before calling tree and tree ensemble training. * `PythonMLlibAPI` (the interface between Scala/Java and Python for MLlib) was a public API but is now private, declared `private[python]`. This was never meant for external use. +* In linear regression (including Lasso and ridge regression), the squared loss is now divided by 2. + So in order to produce the same result as in 1.2, the regularization parameter needs to be divided by 2 and the step size needs to be multiplied by 2. ## Previous Spark Versions --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscribe@spark.apache.org For additional commands, e-mail: commits-help@spark.apache.org