Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/7972#discussion_r36363435
--- Diff:
mllib/src/test/scala/org/apache/spark/ml/feature/VectorSlicerSuite.scala ---
@@ -0,0 +1,119 @@
+/*
+ * 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.ml.feature
+
+import org.apache.spark.SparkFunSuite
+import org.apache.spark.ml.attribute.{Attribute, AttributeGroup,
NumericAttribute}
+import org.apache.spark.ml.param.ParamsSuite
+import org.apache.spark.mllib.linalg.{Vector, Vectors}
+import org.apache.spark.mllib.util.MLlibTestSparkContext
+import org.apache.spark.mllib.util.TestingUtils._
+import org.apache.spark.sql.types.StructType
+import org.apache.spark.sql.{DataFrame, Row, SQLContext}
+
+class VectorSlicerSuite extends SparkFunSuite with MLlibTestSparkContext {
+
+ test("params") {
+ val slicer = new VectorSlicer
+ ParamsSuite.checkParams(slicer)
+ assert(slicer.getSelectedIndices.length === 0)
+ assert(slicer.getSelectedNames.length === 0)
+ withClue("VectorSlicer should not have any features selected by
default") {
+ intercept[IllegalArgumentException] {
+ slicer.validateParams()
+ }
+ }
+ }
+
+ test("feature validity checks") {
+ import VectorSlicer._
+ assert(validIndices(Array(0, 1, 8, 2)))
+ assert(validIndices(Array.empty[Int]))
+ assert(!validIndices(Array(-1)))
+ assert(!validIndices(Array(1, 2, 1)))
+
+ assert(validNames(Array("a", "b")))
+ assert(validNames(Array.empty[String]))
+ assert(!validNames(Array("", "b")))
+ assert(!validNames(Array("a", "b", "a")))
+ }
+
+ test("Test vector slicer") {
+ val sqlContext = new SQLContext(sc)
+
+ val data = Array(
+ Vectors.sparse(5, Seq((0, -2.0), (1, 2.3))),
+ Vectors.dense(-2.0, 2.3, 0.0, 0.0, 1.0),
+ Vectors.dense(0.0, 0.0, 0.0, 0.0, 0.0),
+ Vectors.dense(0.6, -1.1, -3.0, 4.5, 3.3),
+ Vectors.sparse(5, Seq())
+ )
+
+ // Expected after selecting indices 1, 4
+ val expected = Array(
+ Vectors.sparse(2, Seq((0, 2.3))),
+ Vectors.dense(2.3, 1.0),
+ Vectors.dense(0.0, 0.0),
+ Vectors.dense(-1.1, 3.3),
+ Vectors.sparse(2, Seq())
+ )
+
+ val attrs = Array(
+ NumericAttribute.defaultAttr.withIndex(0).withName("f0"),
--- End diff --
minor: The `index` is removed when we create the `AttributeGroup`. So only
`.withName` is needed. This could be
~~~scala
val defaultAttr = NumericAttribute.defaultAttr
val attrs = Array("f0", "f1", "f2", "f3", "f4").map(defaultAttr.withName)
~~~
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