org.apache.flink.ml.classification.linearsvc.LinearSVCModelData Maven / Gradle / Ivy
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package org.apache.flink.ml.classification.linearsvc;
import org.apache.flink.api.common.serialization.Encoder;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.connector.file.src.reader.SimpleStreamFormat;
import org.apache.flink.core.fs.FSDataInputStream;
import org.apache.flink.core.memory.DataInputViewStreamWrapper;
import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
import org.apache.flink.ml.linalg.DenseVector;
import org.apache.flink.ml.linalg.Vector;
import org.apache.flink.ml.linalg.typeinfo.DenseVectorSerializer;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.table.api.Table;
import org.apache.flink.table.api.bridge.java.StreamTableEnvironment;
import org.apache.flink.table.api.internal.TableImpl;
import java.io.EOFException;
import java.io.IOException;
import java.io.OutputStream;
/**
* Model data of {@link LinearSVCModel}.
*
* This class also provides methods to convert model data from Table to Datastream, and classes
* to save/load model data.
*/
public class LinearSVCModelData {
public DenseVector coefficient;
public LinearSVCModelData(DenseVector coefficient) {
this.coefficient = coefficient;
}
public LinearSVCModelData() {}
/**
* Converts the table model to a data stream.
*
* @param modelData The table model data.
* @return The data stream model data.
*/
public static DataStream getModelDataStream(Table modelData) {
StreamTableEnvironment tEnv =
(StreamTableEnvironment) ((TableImpl) modelData).getTableEnvironment();
return tEnv.toDataStream(modelData)
.map(x -> new LinearSVCModelData(((Vector) x.getField(0)).toDense()));
}
/** Data encoder for {@link LinearSVCModel}. */
public static class ModelDataEncoder implements Encoder {
private final DenseVectorSerializer serializer = new DenseVectorSerializer();
@Override
public void encode(LinearSVCModelData modelData, OutputStream outputStream)
throws IOException {
serializer.serialize(
modelData.coefficient, new DataOutputViewStreamWrapper(outputStream));
}
}
/** Data decoder for {@link LinearSVCModel}. */
public static class ModelDataDecoder extends SimpleStreamFormat {
@Override
public Reader createReader(
Configuration configuration, FSDataInputStream inputStream) {
return new Reader() {
private final DenseVectorSerializer serializer = new DenseVectorSerializer();
@Override
public LinearSVCModelData read() throws IOException {
try {
DenseVector coefficient =
serializer.deserialize(new DataInputViewStreamWrapper(inputStream));
return new LinearSVCModelData(coefficient);
} catch (EOFException e) {
return null;
}
}
@Override
public void close() throws IOException {
inputStream.close();
}
};
}
@Override
public TypeInformation getProducedType() {
return TypeInformation.of(LinearSVCModelData.class);
}
}
}