org.apache.flink.ml.examples.feature.InteractionExample Maven / Gradle / Ivy

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 * to you under the Apache License, Version 2.0 (the
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 *     http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.flink.ml.examples.feature;

import org.apache.flink.ml.feature.interaction.Interaction;
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;

import java.util.Arrays;

/** Simple program that creates an Interaction instance and uses it for feature engineering. */
public class InteractionExample {
    public static void main(String[] args) {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        StreamTableEnvironment tEnv = StreamTableEnvironment.create(env);

        // Generates input data.
        DataStream inputStream =
                env.fromElements(
                        Row.of(0, Vectors.dense(1.1, 3.2), Vectors.dense(2, 3)),
                        Row.of(1, Vectors.dense(2.1, 3.1), Vectors.dense(1, 3)));

        Table inputTable = tEnv.fromDataStream(inputStream).as("f0", "f1", "f2");

        // Creates an Interaction object and initializes its parameters.
        Interaction interaction =
                new Interaction().setInputCols("f0", "f1", "f2").setOutputCol("outputVec");

        // Transforms input data.
        Table outputTable = interaction.transform(inputTable)[0];

        // Extracts and displays the results.
        for (CloseableIterator it = outputTable.execute().collect(); it.hasNext(); ) {
            Row row = it.next();
            Object[] inputValues = new Object[interaction.getInputCols().length];
            for (int i = 0; i < inputValues.length; i++) {
                inputValues[i] = row.getField(interaction.getInputCols()[i]);
            }
            Vector outputValue = (Vector) row.getField(interaction.getOutputCol());
            System.out.printf(
                    "Input Values: %s \tOutput Value: %s\n",
                    Arrays.toString(inputValues), outputValue);
        }
    }
}