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// Assumes that chroma-hnswlib is checked out at the same level as chroma
#include "../../../hnswlib/hnswlib/hnswlib.h"
template <typename dist_t, typename data_t = float>
class Index
{
public:
std::string space_name;
int dim;
size_t seed;
bool normalize;
bool index_inited;
hnswlib::HierarchicalNSW<dist_t> *appr_alg;
hnswlib::SpaceInterface<float> *l2space;
Index(const std::string &space_name, const int dim) : space_name(space_name), dim(dim)
{
if (space_name == "l2")
{
l2space = new hnswlib::L2Space(dim);
normalize = false;
}
if (space_name == "ip")
{
l2space = new hnswlib::InnerProductSpace(dim);
// For IP, we expect the vectors to be normalized
normalize = false;
}
if (space_name == "cosine")
{
l2space = new hnswlib::InnerProductSpace(dim);
normalize = true;
}
appr_alg = NULL;
index_inited = false;
}
~Index()
{
delete l2space;
if (appr_alg)
{
delete appr_alg;
}
}
void init_index(const size_t max_elements, const size_t M, const size_t ef_construction, const size_t random_seed, const bool allow_replace_deleted, const bool is_persistent_index, const std::string &persistence_location)
{
if (index_inited)
{
std::runtime_error("Index already inited");
}
appr_alg = new hnswlib::HierarchicalNSW<dist_t>(l2space, max_elements, M, ef_construction, random_seed, allow_replace_deleted, normalize, is_persistent_index, persistence_location);
appr_alg->ef_ = 10; // This is a default value for ef_
index_inited = true;
}
void load_index(const std::string &path_to_index, const bool allow_replace_deleted, const bool is_persistent_index)
{
if (index_inited)
{
std::runtime_error("Index already inited");
}
appr_alg = new hnswlib::HierarchicalNSW<dist_t>(l2space, path_to_index, false, 0, allow_replace_deleted, normalize, is_persistent_index);
index_inited = true;
}
void persist_dirty()
{
if (!index_inited)
{
std::runtime_error("Index not inited");
}
appr_alg->persistDirty();
}
void add_item(const data_t *data, const hnswlib::labeltype id, const bool replace_deleted = false)
{
if (!index_inited)
{
std::runtime_error("Index not inited");
}
appr_alg->addPoint(data, id);
}
void get_item(const hnswlib::labeltype id, data_t *data)
{
if (!index_inited)
{
std::runtime_error("Index not inited");
}
std::vector<data_t> ret_data = appr_alg->template getDataByLabel<data_t>(id); // This checks if id is deleted
for (int i = 0; i < dim; i++)
{
data[i] = ret_data[i];
}
}
int mark_deleted(const hnswlib::labeltype id)
{
if (!index_inited)
{
std::runtime_error("Index not inited");
}
appr_alg->markDelete(id);
return 0;
}
void knn_query(const data_t *query_vector, const size_t k, hnswlib::labeltype *ids, data_t *distance)
{
if (!index_inited)
{
std::runtime_error("Index not inited");
}
std::priority_queue<std::pair<dist_t, hnswlib::labeltype>> res = appr_alg->searchKnn(query_vector, k);
if (res.size() < k)
{
// TODO: This is ok and we should return < K results, but for maintining compatibility with the old API we throw an error for now
std::runtime_error("Not enough results");
}
int total_results = std::min(res.size(), k);
for (int i = total_results - 1; i >= 0; i--)
{
std::pair<dist_t, hnswlib::labeltype> res_i = res.top();
ids[i] = res_i.second;
distance[i] = res_i.first;
res.pop();
}
}
int get_ef()
{
if (!index_inited)
{
std::runtime_error("Index not inited");
}
return appr_alg->ef_;
}
void set_ef(const size_t ef)
{
if (!index_inited)
{
std::runtime_error("Index not inited");
}
appr_alg->ef_ = ef;
}
};
extern "C"
{
Index<float> *create_index(const char *space_name, const int dim)
{
return new Index<float>(space_name, dim);
}
void init_index(Index<float> *index, const size_t max_elements, const size_t M, const size_t ef_construction, const size_t random_seed, const bool allow_replace_deleted, const bool is_persistent_index, const char *persistence_location)
{
index->init_index(max_elements, M, ef_construction, random_seed, allow_replace_deleted, is_persistent_index, persistence_location);
}
void load_index(Index<float> *index, const char *path_to_index, const bool allow_replace_deleted, const bool is_persistent_index)
{
index->load_index(path_to_index, allow_replace_deleted, is_persistent_index);
}
void persist_dirty(Index<float> *index)
{
index->persist_dirty();
}
void add_item(Index<float> *index, const float *data, const hnswlib::labeltype id, const bool replace_deleted)
{
index->add_item(data, id);
}
void get_item(Index<float> *index, const hnswlib::labeltype id, float *data)
{
index->get_item(id, data);
}
int mark_deleted(Index<float> *index, const hnswlib::labeltype id)
{
return index->mark_deleted(id);
}
void knn_query(Index<float> *index, const float *query_vector, const size_t k, hnswlib::labeltype *ids, float *distance)
{
index->knn_query(query_vector, k, ids, distance);
}
int get_ef(Index<float> *index)
{
return index->appr_alg->ef_;
}
void set_ef(Index<float> *index, const size_t ef)
{
index->set_ef(ef);
}
}
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