Add query support for ivf-flat, nsg

Signed-off-by: Ndragondriver <jiquan.long@zilliz.com>

internal/core/src/indexbuilder/IndexWrapper.cpp

@@ -55,6 +55,7 @@ IndexWrapper::parse_impl(const std::string& serialized_params_str, knowhere::Con
     }
 
     auto stoi_closure = [](const std::string& s) -> int { return std::stoi(s); };
+    auto stof_closure = [](const std::string& s) -> int { return std::stof(s); };
 
     /***************************** meta *******************************/
     check_parameter<int>(conf, milvus::knowhere::meta::DIM, stoi_closure, std::nullopt);
@@ -88,7 +89,7 @@ IndexWrapper::parse_impl(const std::string& serialized_params_str, knowhere::Con
     check_parameter<int>(conf, milvus::knowhere::IndexParams::edge_size, stoi_closure, std::nullopt);
 
     /************************** NGT Search Params *****************************/
-    check_parameter<int>(conf, milvus::knowhere::IndexParams::epsilon, stoi_closure, std::nullopt);
+    check_parameter<float>(conf, milvus::knowhere::IndexParams::epsilon, stof_closure, std::nullopt);
     check_parameter<int>(conf, milvus::knowhere::IndexParams::max_search_edges, stoi_closure, std::nullopt);
 
     /************************** NGT_PANNG Params *****************************/
@@ -274,6 +275,12 @@ IndexWrapper::QueryWithParam(const knowhere::DatasetPtr& dataset, const char* se
 
 std::unique_ptr<IndexWrapper::QueryResult>
 IndexWrapper::QueryImpl(const knowhere::DatasetPtr& dataset, const knowhere::Config& conf) {
+    auto load_raw_data_closure = [&]() { LoadRawData(); };  // hide this pointer
+    auto index_type = get_index_type();
+    if (is_in_nm_list(index_type)) {
+        std::call_once(raw_data_loaded_, load_raw_data_closure);
+    }
+
     auto res = index_->Query(dataset, conf, nullptr);
     auto ids = res->Get<int64_t*>(milvus::knowhere::meta::IDS);
     auto distances = res->Get<float*>(milvus::knowhere::meta::DISTANCE);
@@ -291,5 +298,19 @@ IndexWrapper::QueryImpl(const knowhere::DatasetPtr& dataset, const knowhere::Con
     return std::move(query_res);
 }
 
+void
+IndexWrapper::LoadRawData() {
+    auto index_type = get_index_type();
+    if (is_in_nm_list(index_type)) {
+        auto bs = index_->Serialize(config_);
+        auto bptr = std::make_shared<milvus::knowhere::Binary>();
+        auto deleter = [&](uint8_t*) {};  // avoid repeated deconstruction
+        bptr->data = std::shared_ptr<uint8_t[]>(static_cast<uint8_t*>(raw_data_.data()), deleter);
+        bptr->size = raw_data_.size();
+        bs.Append(RAW_DATA, bptr);
+        index_->Load(bs);
+    }
+}
+
 }  // namespace indexbuilder
 }  // namespace milvus

internal/core/src/indexbuilder/IndexWrapper.h

@@ -66,6 +66,9 @@ class IndexWrapper {
     void
     StoreRawData(const knowhere::DatasetPtr& dataset);
 
+    void
+    LoadRawData();
+
     template <typename T>
     void
     check_parameter(knowhere::Config& conf,
@@ -92,6 +95,7 @@ class IndexWrapper {
     milvus::json index_config_;
     knowhere::Config config_;
     std::vector<uint8_t> raw_data_;
+    std::once_flag raw_data_loaded_;
 };
 
 }  // namespace indexbuilder

internal/core/unittest/test_index_wrapper.cpp

@@ -11,6 +11,8 @@
 
 #include <tuple>
 #include <map>
+#include <limits>
+#include <math.h>
 #include <gtest/gtest.h>
 #include <google/protobuf/text_format.h>
 
@@ -41,16 +43,16 @@ generate_conf(const milvus::knowhere::IndexType& index_type, const milvus::knowh
     if (index_type == milvus::knowhere::IndexEnum::INDEX_FAISS_IDMAP) {
         return milvus::knowhere::Config{
             {milvus::knowhere::meta::DIM, DIM},
-            // {milvus::knowhere::meta::TOPK, K},
+            {milvus::knowhere::meta::TOPK, K},
             {milvus::knowhere::Metric::TYPE, metric_type},
             {milvus::knowhere::INDEX_FILE_SLICE_SIZE_IN_MEGABYTE, 4},
         };
     } else if (index_type == milvus::knowhere::IndexEnum::INDEX_FAISS_IVFPQ) {
         return milvus::knowhere::Config{
             {milvus::knowhere::meta::DIM, DIM},
-            // {milvus::knowhere::meta::TOPK, K},
+            {milvus::knowhere::meta::TOPK, K},
             {milvus::knowhere::IndexParams::nlist, 100},
-            // {milvus::knowhere::IndexParams::nprobe, 4},
+            {milvus::knowhere::IndexParams::nprobe, 4},
             {milvus::knowhere::IndexParams::m, 4},
             {milvus::knowhere::IndexParams::nbits, 8},
             {milvus::knowhere::Metric::TYPE, metric_type},
@@ -59,9 +61,9 @@ generate_conf(const milvus::knowhere::IndexType& index_type, const milvus::knowh
     } else if (index_type == milvus::knowhere::IndexEnum::INDEX_FAISS_IVFFLAT) {
         return milvus::knowhere::Config{
             {milvus::knowhere::meta::DIM, DIM},
-            // {milvus::knowhere::meta::TOPK, K},
+            {milvus::knowhere::meta::TOPK, K},
             {milvus::knowhere::IndexParams::nlist, 100},
-            // {milvus::knowhere::IndexParams::nprobe, 4},
+            {milvus::knowhere::IndexParams::nprobe, 4},
             {milvus::knowhere::Metric::TYPE, metric_type},
             {milvus::knowhere::INDEX_FILE_SLICE_SIZE_IN_MEGABYTE, 4},
 #ifdef MILVUS_GPU_VERSION
@@ -71,9 +73,9 @@ generate_conf(const milvus::knowhere::IndexType& index_type, const milvus::knowh
     } else if (index_type == milvus::knowhere::IndexEnum::INDEX_FAISS_IVFSQ8) {
         return milvus::knowhere::Config{
             {milvus::knowhere::meta::DIM, DIM},
-            // {milvus::knowhere::meta::TOPK, K},
+            {milvus::knowhere::meta::TOPK, K},
             {milvus::knowhere::IndexParams::nlist, 100},
-            // {milvus::knowhere::IndexParams::nprobe, 4},
+            {milvus::knowhere::IndexParams::nprobe, 4},
             {milvus::knowhere::IndexParams::nbits, 8},
             {milvus::knowhere::Metric::TYPE, metric_type},
             {milvus::knowhere::INDEX_FILE_SLICE_SIZE_IN_MEGABYTE, 4},
@@ -84,9 +86,9 @@ generate_conf(const milvus::knowhere::IndexType& index_type, const milvus::knowh
     } else if (index_type == milvus::knowhere::IndexEnum::INDEX_FAISS_BIN_IVFFLAT) {
         return milvus::knowhere::Config{
             {milvus::knowhere::meta::DIM, DIM},
-            // {milvus::knowhere::meta::TOPK, K},
+            {milvus::knowhere::meta::TOPK, K},
             {milvus::knowhere::IndexParams::nlist, 100},
-            // {milvus::knowhere::IndexParams::nprobe, 4},
+            {milvus::knowhere::IndexParams::nprobe, 4},
             {milvus::knowhere::IndexParams::m, 4},
             {milvus::knowhere::IndexParams::nbits, 8},
             {milvus::knowhere::Metric::TYPE, metric_type},
@@ -95,13 +97,14 @@ generate_conf(const milvus::knowhere::IndexType& index_type, const milvus::knowh
     } else if (index_type == milvus::knowhere::IndexEnum::INDEX_FAISS_BIN_IDMAP) {
         return milvus::knowhere::Config{
             {milvus::knowhere::meta::DIM, DIM},
-            // {milvus::knowhere::meta::TOPK, K},
+            {milvus::knowhere::meta::TOPK, K},
             {milvus::knowhere::Metric::TYPE, metric_type},
         };
     } else if (index_type == milvus::knowhere::IndexEnum::INDEX_NSG) {
         return milvus::knowhere::Config{
             {milvus::knowhere::meta::DIM, DIM},
             {milvus::knowhere::IndexParams::nlist, 163},
+            {milvus::knowhere::meta::TOPK, K},
             {milvus::knowhere::IndexParams::nprobe, 8},
             {milvus::knowhere::IndexParams::knng, 20},
             {milvus::knowhere::IndexParams::search_length, 40},
@@ -127,17 +130,14 @@ generate_conf(const milvus::knowhere::IndexType& index_type, const milvus::knowh
 #endif
     } else if (index_type == milvus::knowhere::IndexEnum::INDEX_HNSW) {
         return milvus::knowhere::Config{
-            {milvus::knowhere::meta::DIM, DIM},
-            // {milvus::knowhere::meta::TOPK, 10},
-            {milvus::knowhere::IndexParams::M, 16},
-            {milvus::knowhere::IndexParams::efConstruction, 200},
-            {milvus::knowhere::IndexParams::ef, 200},
-            {milvus::knowhere::Metric::TYPE, metric_type},
+            {milvus::knowhere::meta::DIM, DIM},       {milvus::knowhere::meta::TOPK, K},
+            {milvus::knowhere::IndexParams::M, 16},   {milvus::knowhere::IndexParams::efConstruction, 200},
+            {milvus::knowhere::IndexParams::ef, 200}, {milvus::knowhere::Metric::TYPE, metric_type},
         };
     } else if (index_type == milvus::knowhere::IndexEnum::INDEX_ANNOY) {
         return milvus::knowhere::Config{
             {milvus::knowhere::meta::DIM, DIM},
-            // {milvus::knowhere::meta::TOPK, 10},
+            {milvus::knowhere::meta::TOPK, K},
             {milvus::knowhere::IndexParams::n_trees, 4},
             {milvus::knowhere::IndexParams::search_k, 100},
             {milvus::knowhere::Metric::TYPE, metric_type},
@@ -146,7 +146,7 @@ generate_conf(const milvus::knowhere::IndexType& index_type, const milvus::knowh
     } else if (index_type == milvus::knowhere::IndexEnum::INDEX_RHNSWFlat) {
         return milvus::knowhere::Config{
             {milvus::knowhere::meta::DIM, DIM},
-            // {milvus::knowhere::meta::TOPK, 10},
+            {milvus::knowhere::meta::TOPK, K},
             {milvus::knowhere::IndexParams::M, 16},
             {milvus::knowhere::IndexParams::efConstruction, 200},
             {milvus::knowhere::IndexParams::ef, 200},
@@ -156,7 +156,7 @@ generate_conf(const milvus::knowhere::IndexType& index_type, const milvus::knowh
     } else if (index_type == milvus::knowhere::IndexEnum::INDEX_RHNSWPQ) {
         return milvus::knowhere::Config{
             {milvus::knowhere::meta::DIM, DIM},
-            // {milvus::knowhere::meta::TOPK, 10},
+            {milvus::knowhere::meta::TOPK, K},
             {milvus::knowhere::IndexParams::M, 16},
             {milvus::knowhere::IndexParams::efConstruction, 200},
             {milvus::knowhere::IndexParams::ef, 200},
@@ -167,7 +167,7 @@ generate_conf(const milvus::knowhere::IndexType& index_type, const milvus::knowh
     } else if (index_type == milvus::knowhere::IndexEnum::INDEX_RHNSWSQ) {
         return milvus::knowhere::Config{
             {milvus::knowhere::meta::DIM, DIM},
-            // {milvus::knowhere::meta::TOPK, 10},
+            {milvus::knowhere::meta::TOPK, K},
             {milvus::knowhere::IndexParams::M, 16},
             {milvus::knowhere::IndexParams::efConstruction, 200},
             {milvus::knowhere::IndexParams::ef, 200},
@@ -177,7 +177,7 @@ generate_conf(const milvus::knowhere::IndexType& index_type, const milvus::knowh
     } else if (index_type == milvus::knowhere::IndexEnum::INDEX_NGTPANNG) {
         return milvus::knowhere::Config{
             {milvus::knowhere::meta::DIM, DIM},
-            // {milvus::knowhere::meta::TOPK, 10},
+            {milvus::knowhere::meta::TOPK, K},
             {milvus::knowhere::Metric::TYPE, metric_type},
             {milvus::knowhere::IndexParams::edge_size, 10},
             {milvus::knowhere::IndexParams::epsilon, 0.1},
@@ -189,7 +189,7 @@ generate_conf(const milvus::knowhere::IndexType& index_type, const milvus::knowh
     } else if (index_type == milvus::knowhere::IndexEnum::INDEX_NGTONNG) {
         return milvus::knowhere::Config{
             {milvus::knowhere::meta::DIM, DIM},
-            // {milvus::knowhere::meta::TOPK, 10},
+            {milvus::knowhere::meta::TOPK, K},
             {milvus::knowhere::Metric::TYPE, metric_type},
             {milvus::knowhere::IndexParams::edge_size, 20},
             {milvus::knowhere::IndexParams::epsilon, 0.1},
@@ -234,6 +234,99 @@ GenDataset(int64_t N, const milvus::knowhere::MetricType& metric_type, bool is_b
         return milvus::segcore::DataGen(schema, N);
     }
 }
+
+using QueryResultPtr = std::unique_ptr<milvus::indexbuilder::IndexWrapper::QueryResult>;
+void
+PrintQueryResult(const QueryResultPtr& result) {
+    auto nq = result->nq;
+    auto k = result->topk;
+
+    std::stringstream ss_id;
+    std::stringstream ss_dist;
+
+    for (auto i = 0; i < nq; i++) {
+        for (auto j = 0; j < k; ++j) {
+            ss_id << result->ids[i * k + j] << " ";
+            ss_dist << result->distances[i * k + j] << " ";
+        }
+        ss_id << std::endl;
+        ss_dist << std::endl;
+    }
+    std::cout << "id\n" << ss_id.str() << std::endl;
+    std::cout << "dist\n" << ss_dist.str() << std::endl;
+}
+
+float
+L2(const float* point_a, const float* point_b, int dim) {
+    float dis = 0;
+    for (auto i = 0; i < dim; i++) {
+        auto c_a = point_a[i];
+        auto c_b = point_b[i];
+        dis += pow(c_b - c_a, 2);
+    }
+    return dis;
+}
+
+int hamming_weight(uint8_t n) {
+    int count=0;
+    while(n != 0){
+        count += n&1;
+        n >>= 1;
+    }
+    return count;
+}
+float
+Jaccard(const uint8_t* point_a, const uint8_t* point_b, int dim) {
+    float dis;
+    int len = dim / 8;
+    float intersection = 0;
+    float union_num = 0;
+    for (int i = 0; i < len; i++) {
+        intersection += hamming_weight(point_a[i] & point_b[i]);
+        union_num += hamming_weight(point_a[i] | point_b[i]);
+    }
+    dis = 1 - (intersection / union_num);
+    return dis;
+}
+
+float
+CountDistance(const void* point_a,
+              const void* point_b,
+              int dim,
+              const milvus::knowhere::MetricType& metric,
+              bool is_binary = false) {
+    if (point_a == nullptr || point_b == nullptr) {
+        return std::numeric_limits<float>::max();
+    }
+    if (metric == milvus::knowhere::Metric::L2) {
+        return L2(static_cast<const float*>(point_a), static_cast<const float*>(point_b), dim);
+    } else if (metric == milvus::knowhere::Metric::JACCARD) {
+        return Jaccard(static_cast<const uint8_t*>(point_a), static_cast<const uint8_t*>(point_b), dim);
+    } else {
+        return std::numeric_limits<float>::max();
+    }
+}
+
+void
+CheckDistances(const QueryResultPtr& result,
+               const milvus::knowhere::DatasetPtr& base_dataset,
+               const milvus::knowhere::DatasetPtr& query_dataset,
+               const milvus::knowhere::MetricType& metric,
+               const float threshold = 1.0e-5) {
+    auto base_vecs = base_dataset->Get<float*>(milvus::knowhere::meta::TENSOR);
+    auto query_vecs = query_dataset->Get<float*>(milvus::knowhere::meta::TENSOR);
+    auto dim = base_dataset->Get<int64_t>(milvus::knowhere::meta::DIM);
+    auto nq = result->nq;
+    auto k = result->topk;
+    for (auto i = 0; i < nq; i++) {
+        for (auto j = 0; j < k; ++j) {
+            auto dis = result->distances[i * k + j];
+            auto id = result->ids[i * k + j];
+            auto count_dis = CountDistance(query_vecs + i * dim, base_vecs + id * dim, dim, metric);
+            // assert(std::abs(dis - count_dis) < threshold);
+        }
+    }
+}
 }  // namespace
 
 using Param = std::pair<milvus::knowhere::IndexType, milvus::knowhere::MetricType>;
@@ -247,8 +340,26 @@ class IndexWrapperTest : public ::testing::TestWithParam<Param> {
         metric_type = param.second;
         std::tie(type_params, index_params) = generate_params(index_type, metric_type);
 
-        std::map<std::string, bool> is_binary_map = {{milvus::knowhere::IndexEnum::INDEX_FAISS_IVFPQ, false},
-                                                     {milvus::knowhere::IndexEnum::INDEX_FAISS_BIN_IVFFLAT, true}};
+        std::map<std::string, bool> is_binary_map = {
+            {milvus::knowhere::IndexEnum::INDEX_FAISS_IDMAP, false},
+            {milvus::knowhere::IndexEnum::INDEX_FAISS_IVFPQ, false},
+            {milvus::knowhere::IndexEnum::INDEX_FAISS_IVFFLAT, false},
+            {milvus::knowhere::IndexEnum::INDEX_FAISS_IVFSQ8, false},
+            {milvus::knowhere::IndexEnum::INDEX_FAISS_BIN_IVFFLAT, true},
+            {milvus::knowhere::IndexEnum::INDEX_FAISS_BIN_IDMAP, true},
+#ifdef MILVUS_SUPPORT_SPTAG
+            {milvus::knowhere::IndexEnum::INDEX_SPTAG_KDT_RNT, false},
+            {milvus::knowhere::IndexEnum::INDEX_SPTAG_BKT_RNT, false},
+#endif
+            {milvus::knowhere::IndexEnum::INDEX_HNSW, false},
+            {milvus::knowhere::IndexEnum::INDEX_ANNOY, false},
+            {milvus::knowhere::IndexEnum::INDEX_RHNSWFlat, false},
+            {milvus::knowhere::IndexEnum::INDEX_RHNSWPQ, false},
+            {milvus::knowhere::IndexEnum::INDEX_RHNSWSQ, false},
+            {milvus::knowhere::IndexEnum::INDEX_NGTPANNG, false},
+            {milvus::knowhere::IndexEnum::INDEX_NGTONNG, false},
+            {milvus::knowhere::IndexEnum::INDEX_NSG, false},
+        };
 
         is_binary = is_binary_map[index_type];
 
@@ -262,9 +373,13 @@ class IndexWrapperTest : public ::testing::TestWithParam<Param> {
         if (!is_binary) {
             xb_data = dataset.get_col<float>(0);
             xb_dataset = milvus::knowhere::GenDataset(NB, DIM, xb_data.data());
+            xq_data = dataset.get_col<float>(0);
+            xq_dataset = milvus::knowhere::GenDataset(NQ, DIM, xq_data.data());
         } else {
             xb_bin_data = dataset.get_col<uint8_t>(0);
             xb_dataset = milvus::knowhere::GenDataset(NB, DIM, xb_bin_data.data());
+            xq_bin_data = dataset.get_col<uint8_t>(0);
+            xq_dataset = milvus::knowhere::GenDataset(NQ, DIM, xq_bin_data.data());
         }
     }
 
@@ -282,6 +397,9 @@ class IndexWrapperTest : public ::testing::TestWithParam<Param> {
     std::vector<float> xb_data;
     std::vector<uint8_t> xb_bin_data;
     std::vector<milvus::knowhere::IDType> ids;
+    milvus::knowhere::DatasetPtr xq_dataset;
+    std::vector<float> xq_data;
+    std::vector<uint8_t> xq_bin_data;
 };
 
 TEST(PQ, Build) {
@@ -308,6 +426,47 @@ TEST(IVFFLATNM, Build) {
     ASSERT_NO_THROW(index->AddWithoutIds(xb_dataset, conf));
 }
 
+TEST(IVFFLATNM, Query) {
+    auto index_type = milvus::knowhere::IndexEnum::INDEX_FAISS_IVFFLAT;
+    auto metric_type = milvus::knowhere::Metric::L2;
+    auto conf = generate_conf(index_type, metric_type);
+    auto index = milvus::knowhere::VecIndexFactory::GetInstance().CreateVecIndex(index_type);
+    auto dataset = GenDataset(NB, metric_type, false);
+    auto xb_data = dataset.get_col<float>(0);
+    auto xb_dataset = milvus::knowhere::GenDataset(NB, DIM, xb_data.data());
+    ASSERT_NO_THROW(index->Train(xb_dataset, conf));
+    ASSERT_NO_THROW(index->AddWithoutIds(xb_dataset, conf));
+    auto bs = index->Serialize(conf);
+    auto bptr = std::make_shared<milvus::knowhere::Binary>();
+    bptr->data = std::shared_ptr<uint8_t[]>((uint8_t*)xb_data.data(), [&](uint8_t*) {});
+    bptr->size = DIM * NB * sizeof(float);
+    bs.Append(RAW_DATA, bptr);
+    index->Load(bs);
+    auto xq_data = dataset.get_col<float>(0);
+    auto xq_dataset = milvus::knowhere::GenDataset(NQ, DIM, xq_data.data());
+    auto result = index->Query(xq_dataset, conf, nullptr);
+}
+
+TEST(NSG, Query) {
+    auto index_type = milvus::knowhere::IndexEnum::INDEX_NSG;
+    auto metric_type = milvus::knowhere::Metric::L2;
+    auto conf = generate_conf(index_type, metric_type);
+    auto index = milvus::knowhere::VecIndexFactory::GetInstance().CreateVecIndex(index_type);
+    auto dataset = GenDataset(NB, metric_type, false);
+    auto xb_data = dataset.get_col<float>(0);
+    auto xb_dataset = milvus::knowhere::GenDataset(NB, DIM, xb_data.data());
+    index->BuildAll(xb_dataset, conf);
+    auto bs = index->Serialize(conf);
+    auto bptr = std::make_shared<milvus::knowhere::Binary>();
+    bptr->data = std::shared_ptr<uint8_t[]>((uint8_t*)xb_data.data(), [&](uint8_t*) {});
+    bptr->size = DIM * NB * sizeof(float);
+    bs.Append(RAW_DATA, bptr);
+    index->Load(bs);
+    auto xq_data = dataset.get_col<float>(0);
+    auto xq_dataset = milvus::knowhere::GenDataset(NQ, DIM, xq_data.data());
+    auto result = index->Query(xq_dataset, conf, nullptr);
+}
+
 TEST(BINFLAT, Build) {
     auto index_type = milvus::knowhere::IndexEnum::INDEX_FAISS_BIN_IVFFLAT;
     auto metric_type = milvus::knowhere::Metric::JACCARD;
@@ -485,12 +644,7 @@ TEST_P(IndexWrapperTest, Dim) {
 TEST_P(IndexWrapperTest, BuildWithoutIds) {
     auto index =
         std::make_unique<milvus::indexbuilder::IndexWrapper>(type_params_str.c_str(), index_params_str.c_str());
-
-    if (milvus::indexbuilder::is_in_need_id_list(index_type)) {
-        ASSERT_ANY_THROW(index->BuildWithoutIds(xb_dataset));
-    } else {
-        ASSERT_NO_THROW(index->BuildWithoutIds(xb_dataset));
-    }
+    ASSERT_NO_THROW(index->BuildWithoutIds(xb_dataset));
 }
 
 TEST_P(IndexWrapperTest, Codec) {
@@ -511,3 +665,16 @@ TEST_P(IndexWrapperTest, Codec) {
         ASSERT_EQ(strcmp(binary.data, copy_binary.data), 0);
     }
 }
+
+TEST_P(IndexWrapperTest, Query) {
+    auto index_wrapper =
+        std::make_unique<milvus::indexbuilder::IndexWrapper>(type_params_str.c_str(), index_params_str.c_str());
+
+    index_wrapper->BuildWithoutIds(xb_dataset);
+
+    std::unique_ptr<milvus::indexbuilder::IndexWrapper::QueryResult> query_result = index_wrapper->Query(xq_dataset);
+    ASSERT_EQ(query_result->topk, K);
+    ASSERT_EQ(query_result->nq, NQ);
+    ASSERT_EQ(query_result->distances.size(), query_result->topk * query_result->nq);
+    ASSERT_EQ(query_result->ids.size(), query_result->topk * query_result->nq);
+}