spark ChiSquareTestExample 源码
spark ChiSquareTestExample 代码
文件路径：/examples/src/main/scala/org/apache/spark/examples/ml/ChiSquareTestExample.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.linalg.{Vector, Vectors}
import org.apache.spark.ml.stat.ChiSquareTest
// $example off$
import org.apache.spark.sql.SparkSession
/**
* An example for Chi-square hypothesis testing.
* Run with
* {{{
* bin/run-example ml.ChiSquareTestExample
* }}}
*/
object ChiSquareTestExample {
def main(args: Array[String]): Unit = {
val spark = SparkSession
.builder
.appName("ChiSquareTestExample")
.getOrCreate()
import spark.implicits._
// $example on$
val data = Seq(
(0.0, Vectors.dense(0.5, 10.0)),
(0.0, Vectors.dense(1.5, 20.0)),
(1.0, Vectors.dense(1.5, 30.0)),
(0.0, Vectors.dense(3.5, 30.0)),
(0.0, Vectors.dense(3.5, 40.0)),
(1.0, Vectors.dense(3.5, 40.0))
)
val df = data.toDF("label", "features")
val chi = ChiSquareTest.test(df, "features", "label").head
println(s"pValues = ${chi.getAs[Vector](0)}")
println(s"degreesOfFreedom ${chi.getSeq[Int](1).mkString("[", ",", "]")}")
println(s"statistics ${chi.getAs[Vector](2)}")
// $example off$
spark.stop()
}
}
// scalastyle:on println
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