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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.tensor.serialization;
import com.yahoo.io.GrowableByteBuffer;
import com.yahoo.tensor.Tensor;
import com.yahoo.tensor.TensorAddress;
import com.yahoo.tensor.TensorType;
import java.util.Iterator;
import java.util.List;
import java.util.Optional;
import java.util.function.Consumer;
import java.util.function.Supplier;
/**
* Implementation of a sparse binary format for a tensor on the form:
*
* Sorted dimensions = num_dimensions [dimension_str_len dimension_str_bytes]*
* Cells = num_cells [label_1_str_len label_1_str_bytes ... label_N_str_len label_N_str_bytes cell_value]*
*
* Note that the dimensions are sorted and the tensor address labels are given in the same sorted order.
* Unspecified labels are encoded as the empty string "".
*
* @author geirst
*/
class SparseBinaryFormat implements BinaryFormat {
private final TensorType.Value serializationValueType;
SparseBinaryFormat() {
this(TensorType.Value.DOUBLE);
}
SparseBinaryFormat(TensorType.Value serializationValueType) {
this.serializationValueType = serializationValueType;
}
@Override
public void encode(GrowableByteBuffer buffer, Tensor tensor) {
encodeDimensions(buffer, tensor.type().dimensions());
encodeCells(buffer, tensor);
}
private void encodeDimensions(GrowableByteBuffer buffer, List<TensorType.Dimension> sortedDimensions) {
buffer.putInt1_4Bytes(sortedDimensions.size());
for (TensorType.Dimension dimension : sortedDimensions) {
buffer.putUtf8String(dimension.name());
}
}
private void encodeCells(GrowableByteBuffer buffer, Tensor tensor) {
buffer.putInt1_4Bytes((int)tensor.size()); // XXX: Size truncation
switch (serializationValueType) {
case DOUBLE: encodeCells(buffer, tensor, buffer::putDouble); break;
case FLOAT: encodeCells(buffer, tensor, (val) -> buffer.putFloat(val.floatValue())); break;
}
}
private void encodeCells(GrowableByteBuffer buffer, Tensor tensor, Consumer<Double> consumer) {
for (Iterator<Tensor.Cell> i = tensor.cellIterator(); i.hasNext(); ) {
Tensor.Cell cell = i.next();
encodeAddress(buffer, cell.getKey());
consumer.accept(cell.getValue());
}
}
private void encodeAddress(GrowableByteBuffer buffer, TensorAddress address) {
for (int i = 0; i < address.size(); i++)
buffer.putUtf8String(address.label(i));
}
@Override
public Tensor decode(Optional<TensorType> optionalType, GrowableByteBuffer buffer) {
TensorType type;
if (optionalType.isPresent()) {
type = optionalType.get();
if (type.valueType() != this.serializationValueType) {
throw new IllegalArgumentException("Tensor value type mismatch. Value type " + type.valueType() +
" is not " + this.serializationValueType);
}
TensorType serializedType = decodeType(buffer);
if ( ! serializedType.isAssignableTo(type))
throw new IllegalArgumentException("Type/instance mismatch: A tensor of type " + serializedType +
" cannot be assigned to type " + type);
}
else {
type = decodeType(buffer);
}
Tensor.Builder builder = Tensor.Builder.of(type);
decodeCells(buffer, builder, type);
return builder.build();
}
private TensorType decodeType(GrowableByteBuffer buffer) {
int numDimensions = buffer.getInt1_4Bytes();
TensorType.Builder builder = new TensorType.Builder(serializationValueType);
for (int i = 0; i < numDimensions; ++i)
builder.mapped(buffer.getUtf8String());
return builder.build();
}
private void decodeCells(GrowableByteBuffer buffer, Tensor.Builder builder, TensorType type) {
switch (serializationValueType) {
case DOUBLE: decodeCells(buffer, builder, type, buffer::getDouble); break;
case FLOAT: decodeCells(buffer, builder, type, () -> (double)buffer.getFloat()); break;
}
}
private void decodeCells(GrowableByteBuffer buffer, Tensor.Builder builder, TensorType type, Supplier<Double> supplier) {
long numCells = buffer.getInt1_4Bytes(); // XXX: Size truncation
for (long i = 0; i < numCells; ++i) {
Tensor.Builder.CellBuilder cellBuilder = builder.cell();
decodeAddress(buffer, cellBuilder, type);
cellBuilder.value(supplier.get());
}
}
private void decodeAddress(GrowableByteBuffer buffer, Tensor.Builder.CellBuilder builder, TensorType type) {
for (TensorType.Dimension dimension : type.dimensions()) {
String label = buffer.getUtf8String();
if ( ! label.isEmpty()) {
builder.label(dimension.name(), label);
}
}
}
}
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