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[SPARK-17239][ML][DOC] Update user guide for multiclass logistic regression
## What changes were proposed in this pull request? Updates user guide to reflect that LogisticRegression now supports multiclass. Also adds new examples to show multiclass training. ## How was this patch tested? Ran locally using spark-submit, run-example, and copy/paste from user guide into shells. Generated docs and verified correct output. Author: sethah <seth.hendrickson16@gmail.com> Closes #15349 from sethah/SPARK-17239.
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- docs/ml-classification-regression.md 58 additions, 7 deletionsdocs/ml-classification-regression.md
- examples/src/main/java/org/apache/spark/examples/ml/JavaLogisticRegressionWithElasticNetExample.java 14 additions, 0 deletions...mples/ml/JavaLogisticRegressionWithElasticNetExample.java
- examples/src/main/java/org/apache/spark/examples/ml/JavaMulticlassLogisticRegressionWithElasticNetExample.java 55 additions, 0 deletions...avaMulticlassLogisticRegressionWithElasticNetExample.java
- examples/src/main/python/ml/logistic_regression_with_elastic_net.py 10 additions, 0 deletions...rc/main/python/ml/logistic_regression_with_elastic_net.py
- examples/src/main/python/ml/multiclass_logistic_regression_with_elastic_net.py 48 additions, 0 deletions...hon/ml/multiclass_logistic_regression_with_elastic_net.py
- examples/src/main/scala/org/apache/spark/examples/ml/LogisticRegressionWithElasticNetExample.scala 13 additions, 0 deletions...examples/ml/LogisticRegressionWithElasticNetExample.scala
- examples/src/main/scala/org/apache/spark/examples/ml/MulticlassLogisticRegressionWithElasticNetExample.scala 57 additions, 0 deletions...l/MulticlassLogisticRegressionWithElasticNetExample.scala
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