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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/fastos/fastos.h>
#include "sparse_binary_format.h"
#include <vespa/eval/tensor/types.h>
#include <vespa/eval/tensor/tensor.h>
#include <vespa/eval/tensor/tensor_builder.h>
#include <vespa/eval/tensor/tensor_visitor.h>
#include <vespa/vespalib/objects/nbostream.h>
#include <sstream>
using vespalib::nbostream;
namespace vespalib {
namespace tensor {
namespace {
vespalib::string undefinedLabel("");
void
writeTensorAddress(nbostream &output,
const eval::ValueType &type,
const TensorAddress &value)
{
auto elemItr = value.elements().cbegin();
auto elemItrEnd = value.elements().cend();
for (const auto &dimension : type.dimensions()) {
if (elemItr != elemItrEnd && dimension.name == elemItr->dimension()) {
output.writeSmallString(elemItr->label());
++elemItr;
} else {
output.writeSmallString(undefinedLabel);
}
}
assert(elemItr == elemItrEnd);
}
}
class SparseBinaryFormatSerializer : public TensorVisitor
{
uint32_t _numCells;
nbostream _cells;
eval::ValueType _type;
public:
SparseBinaryFormatSerializer();
virtual ~SparseBinaryFormatSerializer() override;
virtual void visit(const TensorAddress &address, double value) override;
void serialize(nbostream &stream, const Tensor &tensor);
};
SparseBinaryFormatSerializer::SparseBinaryFormatSerializer()
: _numCells(0u),
_cells(),
_type(eval::ValueType::error_type())
{
}
SparseBinaryFormatSerializer::~SparseBinaryFormatSerializer()
{
}
void
SparseBinaryFormatSerializer::visit(const TensorAddress &address,
double value)
{
++_numCells;
writeTensorAddress(_cells, _type, address);
_cells << value;
}
void
SparseBinaryFormatSerializer::serialize(nbostream &stream,
const Tensor &tensor)
{
_type = tensor.getType();
tensor.accept(*this);
stream.putInt1_4Bytes(_type.dimensions().size());
for (const auto &dimension : _type.dimensions()) {
stream.writeSmallString(dimension.name);
}
stream.putInt1_4Bytes(_numCells);
stream.write(_cells.peek(), _cells.size());
}
void
SparseBinaryFormat::serialize(nbostream &stream, const Tensor &tensor)
{
SparseBinaryFormatSerializer serializer;
serializer.serialize(stream, tensor);
}
void
SparseBinaryFormat::deserialize(nbostream &stream, TensorBuilder &builder)
{
vespalib::string str;
size_t dimensionsSize = stream.getInt1_4Bytes();
std::vector<TensorBuilder::Dimension> dimensions;
while (dimensions.size() < dimensionsSize) {
stream.readSmallString(str);
dimensions.emplace_back(builder.define_dimension(str));
}
size_t cellsSize = stream.getInt1_4Bytes();
double cellValue = 0.0;
for (size_t cellIdx = 0; cellIdx < cellsSize; ++cellIdx) {
for (size_t dimension = 0; dimension < dimensionsSize; ++dimension) {
stream.readSmallString(str);
if (!str.empty()) {
builder.add_label(dimensions[dimension], str);
}
}
stream >> cellValue;
builder.add_cell(cellValue);
}
}
} // namespace vespalib::tensor
} // namespace vespalib
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