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// Copyright 2019 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/util/arrayref.h>
#include "doc_vector_access.h"
#include "nns-l2.h"
#include <memory>
struct NnsHit {
uint32_t docid;
double sqDistance;
NnsHit(uint32_t di, double sqD)
: docid(di), sqDistance(sqD) {}
};
struct NnsHitComparatorLessDistance {
bool operator() (const NnsHit &lhs, const NnsHit& rhs) const {
if (lhs.sqDistance > rhs.sqDistance) return false;
if (lhs.sqDistance < rhs.sqDistance) return true;
return (lhs.docid > rhs.docid);
}
};
struct NnsHitComparatorGreaterDistance {
bool operator() (const NnsHit &lhs, const NnsHit& rhs) const {
if (lhs.sqDistance < rhs.sqDistance) return false;
if (lhs.sqDistance > rhs.sqDistance) return true;
return (lhs.docid > rhs.docid);
}
};
struct NnsHitComparatorLessDocid {
bool operator() (const NnsHit &lhs, const NnsHit& rhs) const {
return (lhs.docid < rhs.docid);
}
};
template <typename FltType = float>
class NNS
{
public:
NNS(uint32_t numDims, const DocVectorAccess<FltType> &dva)
: _numDims(numDims), _dva(dva)
{}
virtual void addDoc(uint32_t docid) = 0;
virtual void removeDoc(uint32_t docid) = 0;
using Vector = vespalib::ConstArrayRef<FltType>;
virtual std::vector<NnsHit> topK(uint32_t k, Vector vector, uint32_t search_k) = 0;
virtual ~NNS() {}
protected:
uint32_t _numDims;
const DocVectorAccess<FltType> &_dva;
};
extern
std::unique_ptr<NNS<float>>
make_annoy_nns(uint32_t numDims, const DocVectorAccess<float> &dva);
extern
std::unique_ptr<NNS<float>>
make_rplsh_nns(uint32_t numDims, const DocVectorAccess<float> &dva);
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