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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 org.apache.spark.ml.tuning
import org.scalatest.FunSuite
import org.apache.spark.ml.classification.LogisticRegression
import org.apache.spark.ml.evaluation.BinaryClassificationEvaluator
import org.apache.spark.mllib.classification.LogisticRegressionSuite.generateLogisticInput
import org.apache.spark.mllib.util.MLlibTestSparkContext
import org.apache.spark.sql.{SQLContext, SchemaRDD}
class CrossValidatorSuite extends FunSuite with MLlibTestSparkContext {
@transient var dataset: SchemaRDD = _
override def beforeAll(): Unit = {
super.beforeAll()
val sqlContext = new SQLContext(sc)
dataset = sqlContext.createSchemaRDD(
sc.parallelize(generateLogisticInput(1.0, 1.0, 100, 42), 2))
}
test("cross validation with logistic regression") {
val lr = new LogisticRegression
val lrParamMaps = new ParamGridBuilder()
.addGrid(lr.regParam, Array(0.001, 1000.0))
.addGrid(lr.maxIter, Array(0, 10))
.build()
val eval = new BinaryClassificationEvaluator
val cv = new CrossValidator()
.setEstimator(lr)
.setEstimatorParamMaps(lrParamMaps)
.setEvaluator(eval)
.setNumFolds(3)
val cvModel = cv.fit(dataset)
val bestParamMap = cvModel.bestModel.fittingParamMap
assert(bestParamMap(lr.regParam) === 0.001)
assert(bestParamMap(lr.maxIter) === 10)
}
}
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