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0001 /* 0002 * Licensed to the Apache Software Foundation (ASF) under one or more 0003 * contributor license agreements. See the NOTICE file distributed with 0004 * this work for additional information regarding copyright ownership. 0005 * The ASF licenses this file to You under the Apache License, Version 2.0 0006 * (the "License"); you may not use this file except in compliance with 0007 * the License. You may obtain a copy of the License at 0008 * 0009 * http://www.apache.org/licenses/LICENSE-2.0 0010 * 0011 * Unless required by applicable law or agreed to in writing, software 0012 * distributed under the License is distributed on an "AS IS" BASIS, 0013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 0014 * See the License for the specific language governing permissions and 0015 * limitations under the License. 0016 */ 0017 0018 package org.apache.spark.examples.ml; 0019 0020 import org.apache.spark.sql.SparkSession; 0021 0022 // $example on$ 0023 import org.apache.spark.ml.feature.StandardScaler; 0024 import org.apache.spark.ml.feature.StandardScalerModel; 0025 import org.apache.spark.sql.Dataset; 0026 import org.apache.spark.sql.Row; 0027 // $example off$ 0028 0029 public class JavaStandardScalerExample { 0030 public static void main(String[] args) { 0031 SparkSession spark = SparkSession 0032 .builder() 0033 .appName("JavaStandardScalerExample") 0034 .getOrCreate(); 0035 0036 // $example on$ 0037 Dataset<Row> dataFrame = 0038 spark.read().format("libsvm").load("data/mllib/sample_libsvm_data.txt"); 0039 0040 StandardScaler scaler = new StandardScaler() 0041 .setInputCol("features") 0042 .setOutputCol("scaledFeatures") 0043 .setWithStd(true) 0044 .setWithMean(false); 0045 0046 // Compute summary statistics by fitting the StandardScaler 0047 StandardScalerModel scalerModel = scaler.fit(dataFrame); 0048 0049 // Normalize each feature to have unit standard deviation. 0050 Dataset<Row> scaledData = scalerModel.transform(dataFrame); 0051 scaledData.show(); 0052 // $example off$ 0053 spark.stop(); 0054 } 0055 }
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