org.apache.spark.examples.mllib.NaiveBayesExample.scala Maven / Gradle / Ivy

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/*
 * 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.mllib

import org.apache.spark.{SparkConf, SparkContext}
// $example on$
import org.apache.spark.mllib.classification.{NaiveBayes, NaiveBayesModel}
import org.apache.spark.mllib.util.MLUtils
// $example off$

object NaiveBayesExample {

  def main(args: Array[String]): Unit = {
    val conf = new SparkConf().setAppName("NaiveBayesExample")
    val sc = new SparkContext(conf)
    // $example on$
    // Load and parse the data file.
    val data = MLUtils.loadLibSVMFile(sc, "data/mllib/sample_libsvm_data.txt")

    // Split data into training (60%) and test (40%).
    val Array(training, test) = data.randomSplit(Array(0.6, 0.4))

    val model = NaiveBayes.train(training, lambda = 1.0, modelType = "multinomial")

    val predictionAndLabel = test.map(p => (model.predict(p.features), p.label))
    val accuracy = 1.0 * predictionAndLabel.filter(x => x._1 == x._2).count() / test.count()

    // Save and load model
    model.save(sc, "target/tmp/myNaiveBayesModel")
    val sameModel = NaiveBayesModel.load(sc, "target/tmp/myNaiveBayesModel")
    // $example off$

    sc.stop()
  }
}

// scalastyle:on println