From ee2e741ac16b01d9cae0eadd35af774547bbd415 Mon Sep 17 00:00:00 2001
From: chie8842 <hayashidac@nttdata.co.jp>
Date: Tue, 8 Nov 2016 13:45:37 +0000
Subject: [SPARK-13770][DOCUMENTATION][ML] Document the ML feature Interaction

I created Scala and Java example and added documentation.

Author: chie8842 <hayashidac@nttdata.co.jp>

Closes #15658 from hayashidac/SPARK-13770.
---
 .../spark/examples/ml/JavaInteractionExample.java  | 88 ++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 examples/src/main/java/org/apache/spark/examples/ml/JavaInteractionExample.java

(limited to 'examples/src/main/java')

diff --git a/examples/src/main/java/org/apache/spark/examples/ml/JavaInteractionExample.java b/examples/src/main/java/org/apache/spark/examples/ml/JavaInteractionExample.java
new file mode 100644
index 0000000000..4213c05703
--- /dev/null
+++ b/examples/src/main/java/org/apache/spark/examples/ml/JavaInteractionExample.java
@@ -0,0 +1,88 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.examples.ml;
+
+import org.apache.spark.ml.feature.Interaction;
+import org.apache.spark.ml.feature.VectorAssembler;
+import org.apache.spark.ml.linalg.Vectors;
+import org.apache.spark.sql.*;
+import org.apache.spark.sql.types.DataTypes;
+import org.apache.spark.sql.types.Metadata;
+import org.apache.spark.sql.types.StructField;
+import org.apache.spark.sql.types.StructType;
+
+import java.util.Arrays;
+import java.util.List;
+
+// $example on$
+// $example off$
+
+public class JavaInteractionExample {
+  public static void main(String[] args) {
+    SparkSession spark = SparkSession
+      .builder()
+      .appName("JavaInteractionExample")
+      .getOrCreate();
+
+    // $example on$
+    List<Row> data = Arrays.asList(
+      RowFactory.create(1, 1, 2, 3, 8, 4, 5),
+      RowFactory.create(2, 4, 3, 8, 7, 9, 8),
+      RowFactory.create(3, 6, 1, 9, 2, 3, 6),
+      RowFactory.create(4, 10, 8, 6, 9, 4, 5),
+      RowFactory.create(5, 9, 2, 7, 10, 7, 3),
+      RowFactory.create(6, 1, 1, 4, 2, 8, 4)
+    );
+    
+    StructType schema = new StructType(new StructField[]{
+      new StructField("id1", DataTypes.IntegerType, false, Metadata.empty()),
+      new StructField("id2", DataTypes.IntegerType, false, Metadata.empty()),
+      new StructField("id3", DataTypes.IntegerType, false, Metadata.empty()),
+      new StructField("id4", DataTypes.IntegerType, false, Metadata.empty()),
+      new StructField("id5", DataTypes.IntegerType, false, Metadata.empty()),
+      new StructField("id6", DataTypes.IntegerType, false, Metadata.empty()),
+      new StructField("id7", DataTypes.IntegerType, false, Metadata.empty())
+    });
+
+    Dataset<Row> df = spark.createDataFrame(data, schema);
+
+    VectorAssembler assembler1 = new VectorAssembler()
+            .setInputCols(new String[]{"id2", "id3", "id4"})
+            .setOutputCol("vec1");
+
+    Dataset<Row> assembled1 = assembler1.transform(df);
+
+    VectorAssembler assembler2 = new VectorAssembler()
+            .setInputCols(new String[]{"id5", "id6", "id7"})
+            .setOutputCol("vec2");
+
+    Dataset<Row> assembled2 = assembler2.transform(assembled1).select("id1", "vec1", "vec2");
+
+    Interaction interaction = new Interaction()
+            .setInputCols(new String[]{"id1","vec1","vec2"})
+            .setOutputCol("interactedCol");
+
+    Dataset<Row> interacted = interaction.transform(assembled2);
+
+    interacted.show(false);
+    // $example off$
+
+    spark.stop();
+  }
+}
+
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