Github user felixcheung commented on a diff in the pull request: https://github.com/apache/spark/pull/22863#discussion_r228727912 --- Diff: examples/src/main/scala/org/apache/spark/examples/ml/PrefixSpanExample.scala --- @@ -0,0 +1,62 @@ +/* + * 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.examples.ml + +// scalastyle:off println + +// $example on$ +import org.apache.spark.ml.fpm.PrefixSpan +// $example off$ +import org.apache.spark.sql.SparkSession + +/** + * An example demonstrating PrefixSpan. + * Run with + * {{{ + * bin/run-example ml.PrefixSpanExample + * }}} + */ +object PrefixSpanExample { + + def main(args: Array[String]): Unit = { + val spark = SparkSession + .builder + .appName(s"${this.getClass.getSimpleName}") + .getOrCreate() + import spark.implicits._ + + // $example on$ + val smallTestData = Seq( + Seq(Seq(1, 2), Seq(3)), + Seq(Seq(1), Seq(3, 2), Seq(1, 2)), + Seq(Seq(1, 2), Seq(5)), + Seq(Seq(6))) + + val df = smallTestData.toDF("sequence") + val result = new PrefixSpan() + .setMinSupport(0.5) + .setMaxPatternLength(5) + .setMaxLocalProjDBSize(32000000) + .findFrequentSequentialPatterns(df) + .show() + // $example off$ + + spark.stop() + } +} +// scalastyle:on println --- End diff -- nit: looks like println is not used in example here
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