spark UnivariateFeatureSelectorExample 源码
spark UnivariateFeatureSelectorExample 代码
文件路径：/examples/src/main/scala/org/apache/spark/examples/ml/UnivariateFeatureSelectorExample.scala
/*
* 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.feature.UnivariateFeatureSelector
import org.apache.spark.ml.linalg.Vectors
// $example off$
import org.apache.spark.sql.SparkSession
/**
* An example for UnivariateFeatureSelector.
* Run with
* {{{
* bin/run-example ml.UnivariateFeatureSelectorExample
* }}}
*/
object UnivariateFeatureSelectorExample {
def main(args: Array[String]): Unit = {
val spark = SparkSession
.builder
.appName("UnivariateFeatureSelectorExample")
.getOrCreate()
import spark.implicits._
// $example on$
val data = Seq(
(1, Vectors.dense(1.7, 4.4, 7.6, 5.8, 9.6, 2.3), 3.0),
(2, Vectors.dense(8.8, 7.3, 5.7, 7.3, 2.2, 4.1), 2.0),
(3, Vectors.dense(1.2, 9.5, 2.5, 3.1, 8.7, 2.5), 3.0),
(4, Vectors.dense(3.7, 9.2, 6.1, 4.1, 7.5, 3.8), 2.0),
(5, Vectors.dense(8.9, 5.2, 7.8, 8.3, 5.2, 3.0), 4.0),
(6, Vectors.dense(7.9, 8.5, 9.2, 4.0, 9.4, 2.1), 4.0)
)
val df = spark.createDataset(data).toDF("id", "features", "label")
val selector = new UnivariateFeatureSelector()
.setFeatureType("continuous")
.setLabelType("categorical")
.setSelectionMode("numTopFeatures")
.setSelectionThreshold(1)
.setFeaturesCol("features")
.setLabelCol("label")
.setOutputCol("selectedFeatures")
val result = selector.fit(df).transform(df)
println(s"UnivariateFeatureSelector output with top ${selector.getSelectionThreshold}" +
s" features selected using f_classif")
result.show()
// $example off$
spark.stop()
}
}
// scalastyle:on println
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