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Classifier.scala
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Classifier.scala
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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.
*/
package scaladl
import java.io._
import org.apache.spark.ml.feature.MinMaxScaler
import org.apache.spark.ml.linalg.Vectors
import org.apache.spark.ml.scaladl.{Classifier}
import org.apache.spark.sql.SparkSession
import org.apache.spark.ml.evaluation.MulticlassClassificationEvaluator
import org.joda.time.{DateTime, DateTimeZone}
object Classifier {
def main(args: Array[String]): Unit = {
if(args.length != 5){
println("Dataset, train size, iterations, num_workers and num_cores should be pased.")
return
}
val spark = SparkSession.builder
.appName("ML Classifier")
.getOrCreate()
val dataset = "./dataset/" + args(0)
val data = spark.read.format("libsvm").load(dataset)
val scaler = new MinMaxScaler()
.setInputCol("features")
.setOutputCol("scaledFeatures")
// materialize data lazily persisted in memory
val scalerModel = scaler.fit(data)
// rescale each feature to range [min, max].
val scaledData = scalerModel.transform(data)
val processedData = scaledData.select("label", "scaledFeatures").toDF("label", "features")
val trainSize = args(1).toFloat
val testSize = 1 - trainSize
val split = processedData.randomSplit(Array(trainSize, testSize), 1234L)
val train = split(0)
val test = split(1)
data.unpersist()
val layers = Array[Int](200, 128, 64, 32, 17)
// create the trainer and set its parameters
val trainer = new Classifier()
.setLayers(layers)
.setBlockSize(256)
.setSeed(DateTime.now(DateTimeZone.UTC).getMillis())
.setMaxIter(args(2).toInt)
// train the model
println("Training on %d workers with %d cores each".format(args(3).toInt, args(4).toInt))
val model = trainer.fit(train)
println("Evaluating...")
val result = model.transform(test)
val predictionAndLabels = result.select("prediction", "label")
val evaluator = new MulticlassClassificationEvaluator()
.setMetricName("accuracy")
println(s"Test set accuracy = ${evaluator.evaluate(predictionAndLabels)}")
}
}