概述
xgboost可以在spark上运行,我用的xgboost的版本是0.7的版本,目前只支持spark2.0以上版本上运行,
编译好jar包,加载到maven仓库里面去:
mvn install:install-file -Dfile=xgboost4j-spark-0.7-jar-with-dependencies.jar -DgroupId=ml.dmlc -DartifactId=xgboost4j-spark -Dversion=0.7 -Dpackaging=jar
添加依赖:
- <dependency>
- <groupId>ml.dmlc</groupId>
- <artifactId>xgboost4j-spark</artifactId>
- <version>0.7</version>
- </dependency>
- <dependency>
- <groupId>org.apache.spark</groupId>
- <artifactId>spark-core_2.10</artifactId>
- <version>2.0.0</version>
- </dependency>
- <dependency>
- <groupId>org.apache.spark</groupId>
- <artifactId>spark-mllib_2.10</artifactId>
- <version>2.0.0</version>
- </dependency>
- </dependencies>
RDD接口:
- package com.meituan.spark_xgboost
- import org.apache.log4j.{ Level, Logger }
- import org.apache.spark.{ SparkConf, SparkContext }
- import ml.dmlc.xgboost4j.scala.spark.XGBoost
- import org.apache.spark.sql.{ SparkSession, Row }
- import org.apache.spark.mllib.util.MLUtils
- import org.apache.spark.ml.feature.LabeledPoint
- import org.apache.spark.ml.linalg.Vectors
- object XgboostR {
- def main(args: Array[String]): Unit = {
- Logger.getLogger("org.apache.spark").setLevel(Level.ERROR)
- Logger.getLogger("org.eclipse.jetty.server").setLevel(Level.OFF)
- val spark = SparkSession.builder.master("local").appName("example").
- config("spark.sql.warehouse.dir", s"file:///Users/shuubiasahi/Documents/spark-warehouse").
- config("spark.sql.shuffle.partitions", "20").getOrCreate()
- spark.conf.set("spark.serializer", "org.apache.spark.serializer.KryoSerializer")
- val path = "/Users/shuubiasahi/Documents/workspace/xgboost/demo/data/"
- val trainString = "agaricus.txt.train"
- val testString = "agaricus.txt.test"
- val train = MLUtils.loadLibSVMFile(spark.sparkContext, path + trainString)
- val test = MLUtils.loadLibSVMFile(spark.sparkContext, path + testString)
- val traindata = train.map { x =>
- val f = x.features.toArray
- val v = x.label
- LabeledPoint(v, Vectors.dense(f))
- }
- val testdata = test.map { x =>
- val f = x.features.toArray
- val v = x.label
- Vectors.dense(f)
- }
- val numRound = 15
- //"objective" -> "reg:linear", //定义学习任务及相应的学习目标
- //"eval_metric" -> "rmse", //校验数据所需要的评价指标 用于做回归
- val paramMap = List(
- "eta" -> 1f,
- "max_depth" ->5, //数的最大深度。缺省值为6 ,取值范围为:[1,∞]
- "silent" -> 1, //取0时表示打印出运行时信息,取1时表示以缄默方式运行,不打印运行时信息。缺省值为0
- "objective" -> "binary:logistic", //定义学习任务及相应的学习目标
- "lambda"->2.5,
- "nthread" -> 1 //XGBoost运行时的线程数。缺省值是当前系统可以获得的最大线程数
- ).toMap
- println(paramMap)
- val model = XGBoost.trainWithRDD(traindata, paramMap, numRound, 55, null, null, useExternalMemory = false, Float.NaN)
- print("sucess")
- val result=model.predict(testdata)
- result.take(10).foreach(println)
- spark.stop();
- }
- }
DataFrame接口:
- package com.meituan.spark_xgboost
- import org.apache.log4j.{ Level, Logger }
- import org.apache.spark.{ SparkConf, SparkContext }
- import ml.dmlc.xgboost4j.scala.spark.XGBoost
- import org.apache.spark.mllib.evaluation.BinaryClassificationMetrics
- import org.apache.spark.sql.{ SparkSession, Row }
- object XgboostD {
- def main(args: Array[String]): Unit = {
- Logger.getLogger("org.apache.spark").setLevel(Level.ERROR)
- Logger.getLogger("org.eclipse.jetty.server").setLevel(Level.OFF)
- val spark = SparkSession.builder.master("local").appName("example").
- config("spark.sql.warehouse.dir", s"file:///Users/shuubiasahi/Documents/spark-warehouse").
- config("spark.sql.shuffle.partitions", "20").getOrCreate()
- spark.conf.set("spark.serializer", "org.apache.spark.serializer.KryoSerializer")
- val path = "/Users/shuubiasahi/Documents/workspace/xgboost/demo/data/"
- val trainString = "agaricus.txt.train"
- val testString = "agaricus.txt.test"
- val train = spark.read.format("libsvm").load(path + trainString).toDF("label", "feature")
- val test = spark.read.format("libsvm").load(path + testString).toDF("label", "feature")
- val numRound = 15
- //"objective" -> "reg:linear", //定义学习任务及相应的学习目标
- //"eval_metric" -> "rmse", //校验数据所需要的评价指标 用于做回归
- val paramMap = List(
- "eta" -> 1f,
- "max_depth" -> 5, //数的最大深度。缺省值为6 ,取值范围为:[1,∞]
- "silent" -> 1, //取0时表示打印出运行时信息,取1时表示以缄默方式运行,不打印运行时信息。缺省值为0
- "objective" -> "binary:logistic", //定义学习任务及相应的学习目标
- "lambda" -> 2.5,
- "nthread" -> 1 //XGBoost运行时的线程数。缺省值是当前系统可以获得的最大线程数
- ).toMap
- val model = XGBoost.trainWithDataFrame(train, paramMap, numRound, 45, obj = null, eval = null, useExternalMemory = false, Float.NaN, "feature", "label")
- val predict = model.transform(test)
- val scoreAndLabels = predict.select(model.getPredictionCol, model.getLabelCol)
- .rdd
- .map { case Row(score: Double, label: Double) => (score, label) }
- //get the auc
- val metric = new BinaryClassificationMetrics(scoreAndLabels)
- val auc = metric.areaUnderROC()
- println("auc:" + auc)
- }
- }