Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/2978#discussion_r19486480
--- Diff:
mllib/src/test/scala/org/apache/spark/mllib/evaluation/RegressionMetricsSuite.scala
---
@@ -0,0 +1,45 @@
+/*
+ * 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.mllib.evaluation
+
+import org.scalatest.FunSuite
+import org.apache.spark.mllib.util.LocalSparkContext
+import org.apache.spark.mllib.util.TestingUtils._
+
+class RegressionMetricsSuite extends FunSuite with LocalSparkContext {
+
+ test("regression metrics") {
+ val valuesAndPreds = sc.parallelize(
+ Seq((3.0,2.5),(-0.5,0.0),(2.0,2.0),(7.0,8.0)),2)
+ val metrics = new RegressionMetrics(valuesAndPreds)
+ assert(metrics.explainedVarianceScore() ~== 0.95717 absTol
1E-5,"explained variance regression score mismatch")
+ assert(metrics.mae() ~== 0.5 absTol 1E-5, "mean absolute error
mismatch")
+ assert(metrics.mse() ~== 0.375 absTol 1E-5, "mean square error
mismatch")
+ assert(metrics.r2_score() ~== 0.94861 absTol 1E-5, "r2 score mismatch")
+ }
+
+ test("regression metrics with complete fitting") {
+ val valuesAndPreds = sc.parallelize(
+ Seq((3.0,3.0),(0.0,0.0),(2.0,2.0),(8.0,8.0)),2)
+ val metrics = new RegressionMetrics(valuesAndPreds)
+ assert(metrics.explainedVarianceScore() ~== 1.0 absTol 1E-5,"explained
variance regression score mismatch")
--- End diff --
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