examples/mllib/JavaPrefixSpanExample.java

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.mllib;
0019
0020 // $example on$
0021 import java.util.Arrays;
0022 import java.util.List;
0023 // $example off$
0024 import org.apache.spark.api.java.JavaRDD;
0025 import org.apache.spark.api.java.JavaSparkContext;
0026 // $example on$
0027 import org.apache.spark.mllib.fpm.PrefixSpan;
0028 import org.apache.spark.mllib.fpm.PrefixSpanModel;
0029 // $example off$
0030 import org.apache.spark.SparkConf;
0031
0032 public class JavaPrefixSpanExample {
0033
0034   public static void main(String[] args) {
0035
0036     SparkConf sparkConf = new SparkConf().setAppName("JavaPrefixSpanExample");
0037     JavaSparkContext sc = new JavaSparkContext(sparkConf);
0038
0039     // $example on$
0040     JavaRDD<List<List<Integer>>> sequences = sc.parallelize(Arrays.asList(
0041       Arrays.asList(Arrays.asList(1, 2), Arrays.asList(3)),
0042       Arrays.asList(Arrays.asList(1), Arrays.asList(3, 2), Arrays.asList(1, 2)),
0043       Arrays.asList(Arrays.asList(1, 2), Arrays.asList(5)),
0044       Arrays.asList(Arrays.asList(6))
0045     ), 2);
0046     PrefixSpan prefixSpan = new PrefixSpan()
0047       .setMinSupport(0.5)
0048       .setMaxPatternLength(5);
0049     PrefixSpanModel<Integer> model = prefixSpan.run(sequences);
0050     for (PrefixSpan.FreqSequence<Integer> freqSeq: model.freqSequences().toJavaRDD().collect()) {
0051       System.out.println(freqSeq.javaSequence() + ", " + freqSeq.freq());
0052     }
0053     // $example off$
0054
0055     sc.stop();
0056   }
0057 }