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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "diversity.hpp"
#include "singlenumericattribute.h"
#include <vespa/vespalib/stllike/hash_map.h>
using std::make_unique;
namespace search::attribute::diversity {
template <typename T>
struct FetchNumberFast {
const T * const attr;
using ValueType = typename T::LoadedValueType;
FetchNumberFast(const IAttributeVector &attr_in) : attr(dynamic_cast<const T *>(&attr_in)) {}
ValueType get(uint32_t docid) const { return attr->getFast(docid); }
bool valid() const { return (attr != nullptr); }
};
struct FetchEnumFast {
IAttributeVector::EnumRefs enumRefs;
using ValueType = uint32_t;
FetchEnumFast(const IAttributeVector &attr) : enumRefs(attr.make_enum_read_view()) {}
ValueType get(uint32_t docid) const { return enumRefs[docid].load_relaxed().ref(); }
bool valid() const { return ! enumRefs.empty(); }
};
struct FetchEnum {
const IAttributeVector *attr;
using ValueType = uint32_t;
FetchEnum(const IAttributeVector & attr_in) : attr(&attr_in) {}
ValueType get(uint32_t docid) const { return attr->getEnum(docid); }
};
struct FetchInteger {
const IAttributeVector * attr;
using ValueType = int64_t;
FetchInteger(const IAttributeVector & attr_in) : attr(&attr_in) {}
ValueType get(uint32_t docid) const { return attr->getInt(docid); }
};
struct FetchFloat {
const IAttributeVector * attr;
using ValueType = double;
FetchFloat(const IAttributeVector & attr_in) : attr(&attr_in) {}
ValueType get(uint32_t docid) const { return attr->getFloat(docid); }
};
template <typename Fetcher>
class DiversityFilterT final : public DiversityFilter {
private:
size_t _total_count;
Fetcher _diversity;
size_t _max_per_group;
size_t _cutoff_max_groups;
bool _cutoff_strict;
using Diversity = vespalib::hash_map<typename Fetcher::ValueType, uint32_t>;
Diversity _seen;
public:
DiversityFilterT(Fetcher diversity, size_t max_per_group, size_t cutoff_max_groups,
bool cutoff_strict, size_t max_total)
: DiversityFilter(max_total), _total_count(0), _diversity(diversity), _max_per_group(max_per_group),
_cutoff_max_groups(cutoff_max_groups), _cutoff_strict(cutoff_strict),
_seen(std::min(cutoff_max_groups, 10000ul)*3)
{ }
bool accepted(uint32_t docId) override;
private:
bool add() {
++_total_count;
return true;
}
bool conditional_add(uint32_t & group_count) {
if (group_count < _max_per_group) {
++group_count;
add();
return true;
}
return false;
}
};
template <typename Fetcher>
bool
DiversityFilterT<Fetcher>::accepted(uint32_t docId) {
if (_total_count < _max_total) {
if ((_seen.size() < _cutoff_max_groups) || _cutoff_strict) {
typename Fetcher::ValueType group = _diversity.get(docId);
if (_seen.size() < _cutoff_max_groups) {
return conditional_add(_seen[group]);
} else {
auto found = _seen.find(group);
return (found == _seen.end()) ? add() : conditional_add(found->second);
}
} else if ( !_cutoff_strict) {
return add();
}
}
return false;
}
std::unique_ptr<DiversityFilter>
DiversityFilter::create(const IAttributeVector &diversity_attr, size_t wanted_hits,
size_t max_per_group,size_t cutoff_max_groups, bool cutoff_strict)
{
if (diversity_attr.hasEnum()) { // must handle enum first
FetchEnumFast fastEnum(diversity_attr);
if (fastEnum.valid()) {
return make_unique<DiversityFilterT<FetchEnumFast>> (fastEnum, max_per_group, cutoff_max_groups, cutoff_strict, wanted_hits);
} else {
return make_unique<DiversityFilterT<FetchEnum>>(FetchEnum(diversity_attr), max_per_group, cutoff_max_groups, cutoff_strict, wanted_hits);
}
} else if (diversity_attr.isIntegerType()) {
using FetchInt32Fast = FetchNumberFast<SingleValueNumericAttribute<IntegerAttributeTemplate<int32_t> > >;
using FetchInt64Fast = FetchNumberFast<SingleValueNumericAttribute<IntegerAttributeTemplate<int64_t> > >;
FetchInt32Fast fastInt32(diversity_attr);
FetchInt64Fast fastInt64(diversity_attr);
if (fastInt32.valid()) {
return make_unique<DiversityFilterT<FetchInt32Fast>>(fastInt32, max_per_group, cutoff_max_groups, cutoff_strict, wanted_hits);
} else if (fastInt64.valid()) {
return make_unique<DiversityFilterT<FetchInt64Fast>>(fastInt64, max_per_group, cutoff_max_groups, cutoff_strict, wanted_hits);
} else {
return make_unique<DiversityFilterT<FetchInteger>>(FetchInteger(diversity_attr), max_per_group, cutoff_max_groups, cutoff_strict, wanted_hits);
}
} else if (diversity_attr.isFloatingPointType()) {
using FetchFloatFast = FetchNumberFast<SingleValueNumericAttribute<FloatingPointAttributeTemplate<float> > >;
using FetchDoubleFast = FetchNumberFast<SingleValueNumericAttribute<FloatingPointAttributeTemplate<double> > >;
FetchFloatFast fastFloat(diversity_attr);
FetchDoubleFast fastDouble(diversity_attr);
if (fastFloat.valid()) {
return make_unique<DiversityFilterT<FetchFloatFast>>(fastFloat, max_per_group, cutoff_max_groups, cutoff_strict, wanted_hits);
} else if (fastDouble.valid()) {
return make_unique<DiversityFilterT<FetchDoubleFast>>(fastDouble, max_per_group, cutoff_max_groups, cutoff_strict, wanted_hits);
} else {
return make_unique<DiversityFilterT<FetchFloat>>(FetchFloat(diversity_attr), max_per_group, cutoff_max_groups, cutoff_strict, wanted_hits);
}
}
return std::unique_ptr<DiversityFilter>();
}
}
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