org.apache.flink.ml.feature.kbinsdiscretizer.KBinsDiscretizerModelData 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.feature.kbinsdiscretizer;
import org.apache.flink.api.common.serialization.Encoder;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.common.typeutils.base.IntSerializer;
import org.apache.flink.api.common.typeutils.base.array.DoublePrimitiveArraySerializer;
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.DataInputView;
import org.apache.flink.core.memory.DataInputViewStreamWrapper;
import org.apache.flink.core.memory.DataOutputView;
import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
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 KBinsDiscretizerModel}.
*
* This class also provides methods to convert model data from Table to a data stream, and
* classes to save/load model data.
*/
public class KBinsDiscretizerModelData {
/**
* The edges of bins for each column, e.g., binEdges[0] is the edges for features at 0-th
* dimension.
*/
public double[][] binEdges;
public KBinsDiscretizerModelData() {}
public KBinsDiscretizerModelData(double[][] binEdges) {
this.binEdges = binEdges;
}
/**
* Converts the table model to a data stream.
*
* @param modelDataTable The table model data.
* @return The data stream model data.
*/
public static DataStream getModelDataStream(Table modelDataTable) {
StreamTableEnvironment tEnv =
(StreamTableEnvironment) ((TableImpl) modelDataTable).getTableEnvironment();
return tEnv.toDataStream(modelDataTable)
.map(x -> new KBinsDiscretizerModelData((double[][]) x.getField(0)));
}
/** Encoder for {@link KBinsDiscretizerModelData}. */
public static class ModelDataEncoder implements Encoder {
@Override
public void encode(KBinsDiscretizerModelData modelData, OutputStream outputStream)
throws IOException {
DataOutputView dataOutputView = new DataOutputViewStreamWrapper(outputStream);
IntSerializer.INSTANCE.serialize(modelData.binEdges.length, dataOutputView);
DoublePrimitiveArraySerializer doubleArraySerializer =
DoublePrimitiveArraySerializer.INSTANCE;
for (double[] binEdge : modelData.binEdges) {
doubleArraySerializer.serialize(binEdge, dataOutputView);
}
}
}
/** Decoder for {@link KBinsDiscretizerModelData}. */
public static class ModelDataDecoder extends SimpleStreamFormat {
@Override
public Reader createReader(
Configuration config, FSDataInputStream stream) {
return new Reader() {
@Override
public KBinsDiscretizerModelData read() throws IOException {
DataInputView source = new DataInputViewStreamWrapper(stream);
try {
int numColumns = IntSerializer.INSTANCE.deserialize(source);
double[][] binEdges = new double[numColumns][];
DoublePrimitiveArraySerializer doubleArraySerializer =
DoublePrimitiveArraySerializer.INSTANCE;
for (int i = 0; i < numColumns; i++) {
binEdges[i] = doubleArraySerializer.deserialize(source);
}
return new KBinsDiscretizerModelData(binEdges);
} catch (EOFException e) {
return null;
}
}
@Override
public void close() throws IOException {
stream.close();
}
};
}
@Override
public TypeInformation getProducedType() {
return TypeInformation.of(KBinsDiscretizerModelData.class);
}
}
}