Github user yanboliang commented on a diff in the pull request: https://github.com/apache/spark/pull/13381#discussion_r65206320 --- Diff: examples/src/main/scala/org/apache/spark/examples/ml/IsotonicRegressionExample.scala --- @@ -0,0 +1,73 @@ +/* + * 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.regression.IsotonicRegression +// $example off$ +import org.apache.spark.sql.functions._ +import org.apache.spark.sql.SparkSession +import org.apache.spark.sql.types.{DoubleType, StructType} + +/** + * An example demonstrating Isotonic Regression. + * Run with + * {{{ + * bin/run-example ml.IsotonicRegressionExample + * }}} + */ +object IsotonicRegressionExample { + + def main(args: Array[String]): Unit = { + + // Creates a SparkSession. + val spark = SparkSession + .builder + .appName(s"${this.getClass.getSimpleName}") + .getOrCreate() + // $example on$ + val ir = new IsotonicRegression().setIsotonic(true) + .setLabelCol("label").setFeaturesCol("features").setWeightCol("weight") + + val dataReader = spark.read + dataReader.schema(new StructType().add("label", DoubleType).add("features", DoubleType)) + + var data = dataReader.csv("data/mllib/sample_isotonic_regression_data.txt") --- End diff -- Ditto, use libsvm format.
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