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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "streamed_value_index.h"
#include "streamed_value_utils.h"
#include <vespa/vespalib/objects/nbostream.h>
#include <vespa/vespalib/util/stringfmt.h>
#include <vespa/vespalib/util/visit_ranges.h>
#include <vespa/log/log.h>
LOG_SETUP(".searchlib.tensor.streamed_value_index");
namespace vespalib::eval {
namespace {
struct StreamedFilterView : Value::Index::View
{
LabelBlockStream label_blocks;
std::vector<size_t> view_dims;
std::vector<string_id> to_match;
StreamedFilterView(LabelBlockStream labels, ConstArrayRef<size_t> view_dims_in)
: label_blocks(std::move(labels)),
view_dims(view_dims_in.begin(), view_dims_in.end()),
to_match()
{
to_match.reserve(view_dims.size());
}
void lookup(ConstArrayRef<const string_id*> addr) override {
label_blocks.reset();
to_match.clear();
for (auto ptr : addr) {
to_match.push_back(*ptr);
}
assert(view_dims.size() == to_match.size());
}
bool next_result(ConstArrayRef<string_id*> addr_out, size_t &idx_out) override {
while (const auto block = label_blocks.next_block()) {
idx_out = block.subspace_index;
bool matches = true;
size_t out_idx = 0;
size_t vdm_idx = 0;
for (size_t dim = 0; dim < block.address.size(); ++dim) {
if (vdm_idx < view_dims.size() && (view_dims[vdm_idx] == dim)) {
matches &= (block.address[dim] == to_match[vdm_idx++]);
} else {
*addr_out[out_idx++] = block.address[dim];
}
}
assert(out_idx == addr_out.size());
assert(vdm_idx == view_dims.size());
if (matches) return true;
}
return false;
}
};
struct StreamedIterationView : Value::Index::View
{
LabelBlockStream label_blocks;
StreamedIterationView(LabelBlockStream labels)
: label_blocks(std::move(labels))
{}
void lookup(ConstArrayRef<const string_id*> addr) override {
label_blocks.reset();
assert(addr.size() == 0);
}
bool next_result(ConstArrayRef<string_id*> addr_out, size_t &idx_out) override {
if (auto block = label_blocks.next_block()) {
idx_out = block.subspace_index;
size_t i = 0;
assert(addr_out.size() == block.address.size());
for (auto ptr : addr_out) {
*ptr = block.address[i++];
}
return true;
}
return false;
}
};
} // namespace <unnamed>
std::unique_ptr<Value::Index::View>
StreamedValueIndex::create_view(ConstArrayRef<size_t> dims) const
{
LabelBlockStream label_stream(_num_subspaces, _labels_ref, _num_mapped_dims);
if (dims.empty()) {
return std::make_unique<StreamedIterationView>(std::move(label_stream));
}
return std::make_unique<StreamedFilterView>(std::move(label_stream), dims);
}
} // namespace vespalib::eval
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