[SPARK-13018][DOCS] Replace example code in mllib-pmml-model-export.md using include_example

Replace example code in mllib-pmml-model-export.md using include_example
https://issues.apache.org/jira/browse/SPARK-13018

The example code in the user guide is embedded in the markdown and hence it is not easy to test. It would be nice to automatically test them. This JIRA is to discuss options to automate example code testing and see what we can do in Spark 1.6.

Goal is to move actual example code to spark/examples and test compilation in Jenkins builds. Then in the markdown, we can reference part of the code to show in the user guide. This requires adding a Jekyll tag that is similar to https://github.com/jekyll/jekyll/blob/master/lib/jekyll/tags/include.rb, e.g., called include_example.
`{% include_example scala/org/apache/spark/examples/mllib/PMMLModelExportExample.scala %}`
Jekyll will find `examples/src/main/scala/org/apache/spark/examples/mllib/PMMLModelExportExample.scala` and pick code blocks marked "example" and replace code block in
`{% highlight %}`
 in the markdown.

See more sub-tasks in parent ticket: https://issues.apache.org/jira/browse/SPARK-11337

Author: Xin Ren <iamshrek@126.com>

Closes #11126 from keypointt/SPARK-13018.

1 files changed, 3 insertions, 32 deletions

diff --git a/docs/mllib-pmml-model-export.md b/docs/mllib-pmml-model-export.md
index b532ad907d..58ed5a0e9d 100644
--- a/docs/mllib-pmml-model-export.md
+++ b/docs/mllib-pmml-model-export.md
@@ -45,41 +45,12 @@ The table below outlines the `spark.mllib` models that can be exported to PMML a
 <div data-lang="scala" markdown="1">
 To export a supported `model` (see table above) to PMML, simply call `model.toPMML`.
 
+As well as exporting the PMML model to a String (`model.toPMML` as in the example above), you can export the PMML model to other formats.
+
 Refer to the [`KMeans` Scala docs](api/scala/index.html#org.apache.spark.mllib.clustering.KMeans) and [`Vectors` Scala docs](api/scala/index.html#org.apache.spark.mllib.linalg.Vectors) for details on the API.
 
 Here a complete example of building a KMeansModel and print it out in PMML format:
-{% highlight scala %}
-import org.apache.spark.mllib.clustering.KMeans
-import org.apache.spark.mllib.linalg.Vectors
-
-// Load and parse the data
-val data = sc.textFile("data/mllib/kmeans_data.txt")
-val parsedData = data.map(s => Vectors.dense(s.split(' ').map(_.toDouble))).cache()
-
-// Cluster the data into two classes using KMeans
-val numClusters = 2
-val numIterations = 20
-val clusters = KMeans.train(parsedData, numClusters, numIterations)
-
-// Export to PMML
-println("PMML Model:\n" + clusters.toPMML)
-{% endhighlight %}
-
-As well as exporting the PMML model to a String (`model.toPMML` as in the example above), you can export the PMML model to other formats:
-
-{% highlight scala %}
-// Export the model to a String in PMML format
-clusters.toPMML
-
-// Export the model to a local file in PMML format
-clusters.toPMML("/tmp/kmeans.xml")
-
-// Export the model to a directory on a distributed file system in PMML format
-clusters.toPMML(sc,"/tmp/kmeans")
-
-// Export the model to the OutputStream in PMML format
-clusters.toPMML(System.out)
-{% endhighlight %}
+{% include_example scala/org/apache/spark/examples/mllib/PMMLModelExportExample.scala %}
 
 For unsupported models, either you will not find a `.toPMML` method or an `IllegalArgumentException` will be thrown.