| /* |
| * 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.flink.ml.examples.feature; |
| |
| import org.apache.flink.ml.feature.vectorslicer.VectorSlicer; |
| import org.apache.flink.ml.linalg.Vector; |
| import org.apache.flink.ml.linalg.Vectors; |
| import org.apache.flink.streaming.api.datastream.DataStream; |
| import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; |
| import org.apache.flink.table.api.Table; |
| import org.apache.flink.table.api.bridge.java.StreamTableEnvironment; |
| import org.apache.flink.types.Row; |
| import org.apache.flink.util.CloseableIterator; |
| |
| /** Simple program that creates a VectorSlicer instance and uses it for feature engineering. */ |
| public class VectorSlicerExample { |
| public static void main(String[] args) { |
| StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(); |
| StreamTableEnvironment tEnv = StreamTableEnvironment.create(env); |
| |
| // Generates input data. |
| DataStream<Row> inputStream = |
| env.fromElements( |
| Row.of(Vectors.dense(2.1, 3.1, 1.2, 3.1, 4.6)), |
| Row.of(Vectors.dense(1.2, 3.1, 4.6, 2.1, 3.1))); |
| Table inputTable = tEnv.fromDataStream(inputStream).as("vec"); |
| |
| // Creates a VectorSlicer object and initializes its parameters. |
| VectorSlicer vectorSlicer = |
| new VectorSlicer().setInputCol("vec").setIndices(1, 2, 3).setOutputCol("slicedVec"); |
| |
| // Uses the VectorSlicer object for feature transformations. |
| Table outputTable = vectorSlicer.transform(inputTable)[0]; |
| |
| // Extracts and displays the results. |
| for (CloseableIterator<Row> it = outputTable.execute().collect(); it.hasNext(); ) { |
| Row row = it.next(); |
| |
| Vector inputValue = (Vector) row.getField(vectorSlicer.getInputCol()); |
| |
| Vector outputValue = (Vector) row.getField(vectorSlicer.getOutputCol()); |
| |
| System.out.printf("Input Value: %s \tOutput Value: %s\n", inputValue, outputValue); |
| } |
| } |
| } |