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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.google.common.annotations.Beta;
import com.yahoo.io.GrowableByteBuffer;
import com.yahoo.tensor.DimensionSizes;
import com.yahoo.tensor.IndexedTensor;
import com.yahoo.tensor.Tensor;
import com.yahoo.tensor.TensorType;
import java.util.Iterator;
import java.util.Optional;
/**
* Implementation of a dense binary format for a tensor on the form:
*
* Sorted dimensions = num_dimensions [dimension_str_len dimension_str_bytes dimension_size_int]*
* Cell_values = [double, double, double, ...]*
* where values are encoded in order of increasing indexes in each dimension, increasing
* indexes of later dimensions in the dimension type before earlier.
*
* @author bratseth
*/
@Beta
public class DenseBinaryFormat implements BinaryFormat {
@Override
public void encode(GrowableByteBuffer buffer, Tensor tensor) {
if ( ! ( tensor instanceof IndexedTensor))
throw new RuntimeException("The dense format is only supported for indexed tensors");
encodeDimensions(buffer, (IndexedTensor)tensor);
encodeCells(buffer, tensor);
}
private void encodeDimensions(GrowableByteBuffer buffer, IndexedTensor tensor) {
buffer.putInt1_4Bytes(tensor.type().dimensions().size());
for (int i = 0; i < tensor.type().dimensions().size(); i++) {
buffer.putUtf8String(tensor.type().dimensions().get(i).name());
buffer.putInt1_4Bytes((int)tensor.dimensionSizes().size(i)); // XXX: Size truncation
}
}
private void encodeCells(GrowableByteBuffer buffer, Tensor tensor) {
Iterator<Double> i = tensor.valueIterator();
while (i.hasNext())
buffer.putDouble(i.next());
}
@Override
public Tensor decode(Optional<TensorType> optionalType, GrowableByteBuffer buffer) {
TensorType type;
DimensionSizes sizes;
if (optionalType.isPresent()) {
type = optionalType.get();
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);
sizes = sizesFromType(serializedType);
}
else {
type = decodeType(buffer);
sizes = sizesFromType(type);
}
Tensor.Builder builder = Tensor.Builder.of(type, sizes);
decodeCells(sizes, buffer, (IndexedTensor.BoundBuilder)builder);
return builder.build();
}
private TensorType decodeType(GrowableByteBuffer buffer) {
int dimensionCount = buffer.getInt1_4Bytes();
TensorType.Builder builder = new TensorType.Builder();
for (int i = 0; i < dimensionCount; i++)
builder.indexed(buffer.getUtf8String(), buffer.getInt1_4Bytes()); // XXX: Size truncation
return builder.build();
}
/** Returns dimension sizes from a type consisting of fully specified, indexed dimensions only */
private DimensionSizes sizesFromType(TensorType type) {
DimensionSizes.Builder builder = new DimensionSizes.Builder(type.dimensions().size());
for (int i = 0; i < type.dimensions().size(); i++)
builder.set(i, type.dimensions().get(i).size().get());
return builder.build();
}
private void decodeCells(DimensionSizes sizes, GrowableByteBuffer buffer, IndexedTensor.BoundBuilder builder) {
for (long i = 0; i < sizes.totalSize(); i++)
builder.cellByDirectIndex(i, buffer.getDouble());
}
}
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