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[SPARK-1273] MLlib bug fixes, improvements, and doc updates for v0.9.1
Cherry-picked a few MLlib commits that are bug fixes, optimization, or doc updates for the v0.9.1 release. JIRA: https://spark-project.atlassian.net/browse/SPARK-1273 Author: Xiangrui Meng <meng@databricks.com> Author: Sean Owen <sowen@cloudera.com> Author: Andrew Tulloch <andrew@tullo.ch> Author: Chen Chao <crazyjvm@gmail.com> Closes apache#175 from mengxr/branch-0.9 and squashes the following commits: d8928ea [Xiangrui Meng] add Apache header to LocalSparkContext a66d386 [Xiangrui Meng] Merge remote-tracking branch 'apache/branch-0.9' into branch-0.9 a899894 [Xiangrui Meng] [SPARK-1237, 1238] Improve the computation of YtY for implicit ALS 46fe493 [Xiangrui Meng] [SPARK-1260]: faster construction of features with intercept 6340a18 [Sean Owen] MLLIB-22. Support negative implicit input in ALS f27441a [Chen Chao] MLLIB-24: url of "Collaborative Filtering for Implicit Feedback Datasets" in ALS is invalid now a26ac90 [Sean Owen] Merge pull request apache#460 from srowen/RandomInitialALSVectors 0564985 [Andrew Tulloch] Fixed import order 2512e67 [Andrew Tulloch] LocalSparkContext for MLlib
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