Github user WeichenXu123 commented on a diff in the pull request:
https://github.com/apache/spark/pull/20446#discussion_r165573866
--- Diff:
examples/src/main/scala/org/apache/spark/examples/ml/SummarizerExample.scala ---
@@ -0,0 +1,60 @@
+/*
+ * 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.
+ */
+
+// scalastyle:off println
+package org.apache.spark.examples.ml
+
+// $example on$
+import org.apache.spark.ml.linalg.{Vector, Vectors}
+import org.apache.spark.ml.stat.Summarizer
+// $example off$
+import org.apache.spark.sql.SparkSession
+
+object SummarizerExample {
+ def main(args: Array[String]): Unit = {
+ val spark = SparkSession
+ .builder
+ .appName("SummarizerExample")
+ .getOrCreate()
+
+ import spark.implicits._
+ import Summarizer._
+
+ // $example on$
+ val data = Seq(
+ (Vectors.dense(2.0, 3.0, 5.0), 1.0),
+ (Vectors.dense(4.0, 6.0, 7.0), 2.0)
+ )
+
+ val df = data.toDF("features", "weight")
+
+ val Tuple1((meanVal, varianceVal)) = df.select(metrics("mean",
"variance")
+ .summary($"features", $"weight"))
+ .as[Tuple1[(Vector, Vector)]].first()
--- End diff --
Do you mean us `.as[((Vector, Vector))]` ? It compile fails..
or Do you mean change to
```
val (meanVal, varianceVal) = df.select(metrics("mean", "variance")
.summary($"features", $"weight"))
.as[(Vector, Vector)].first()
```
? Seems also do not work because it is a "struct type" value in the
returned row. So the first row format should match Row(Row(mean, variance))
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