Program Listing for File hnsw_node.h¶
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// Copyright 2017 Kakao Corp. <http://www.kakaocorp.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
#include <cstdint>
#include <mutex>
#include <vector>
#include "data.h"
namespace n2 {
class HnswNode {
public:
explicit HnswNode(int id, const Data* data, int level, size_t max_m, size_t max_m0);
void CopyHigherLevelLinksToOptIndex(char* mem_offset, uint64_t memory_per_node_higher_level) const;
void CopyDataAndLevel0LinksToOptIndex(char* mem_offset, int higher_level_offset) const;
inline int GetId() const { return id_; }
inline int GetLevel() const { return level_; }
inline size_t GetMaxM() const { return max_m_; }
inline size_t GetMaxM0() const { return max_m0_; }
inline const float* GetData() const { return data_->GetRawData(); }
inline std::vector<HnswNode*>& GetFriends(int level) { return friends_at_layer_[level]; }
inline void SetFriends(int level, std::vector<HnswNode*>& new_friends) {
friends_at_layer_[level].swap(new_friends);
}
inline std::mutex& GetAccessGuard() { return access_guard_; }
private:
void CopyLinksToOptIndex(char* mem_offset, int level) const;
private:
int id_;
const Data* data_;
int level_;
size_t max_m_;
size_t max_m0_;
std::vector<std::vector<HnswNode*>> friends_at_layer_;
std::mutex access_guard_;
};
} // namespace n2