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Switch Product Quantization VQ to mean() when n_centers = 1 #2250

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Switch Product Quantization VQ to mean() when n_centers = 1 #2250

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9d685b5
Switch VQ to mean() when n_centers = 1
lowener Jun 22, 2026
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Add include
lowener Jun 23, 2026
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Change output mdspan
lowener Jun 23, 2026
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21 changes: 14 additions & 7 deletions cpp/src/neighbors/detail/vpq_dataset.cuh
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@
#include <raft/core/resource/cuda_stream_pool.hpp>
#include <raft/core/resources.hpp>
#include <raft/linalg/map.cuh>
#include <raft/stats/mean.cuh>
#include <raft/util/cudart_utils.hpp>
#include <raft/util/integer_utils.hpp>
#include <raft/util/pow2_utils.cuh>
Expand Down Expand Up @@ -170,6 +171,7 @@ template <typename MathT, typename DatasetT>
auto train_vq(const raft::resources& res, const vpq_params& params, const DatasetT& dataset)
-> raft::device_matrix<MathT, uint32_t, raft::row_major>
{
using kmeans_in_type = typename DatasetT::value_type;
const ix_t n_rows = dataset.extent(0);
const ix_t vq_n_centers = params.vq_n_centers;
const ix_t dim = dataset.extent(1);
Expand All @@ -181,16 +183,21 @@ auto train_vq(const raft::resources& res, const vpq_params& params, const Datase
auto vq_centers =
raft::make_device_matrix<MathT, uint32_t, raft::row_major>(res, vq_n_centers, dim);

using kmeans_in_type = typename DatasetT::value_type;
cuvs::cluster::kmeans::balanced_params kmeans_params;
kmeans_params.n_iters = params.kmeans_n_iters;
kmeans_params.metric = cuvs::distance::DistanceType::L2Expanded;
auto vq_centers_view =
raft::make_device_matrix_view<MathT, ix_t>(vq_centers.data_handle(), vq_n_centers, dim);
auto vq_trainset_view = raft::make_device_matrix_view<const kmeans_in_type, ix_t>(
vq_trainset.data_handle(), n_rows_train, dim);
cuvs::cluster::kmeans::fit(res, kmeans_params, vq_trainset_view, vq_centers_view);

if (vq_n_centers == 1) {
auto vq_centers_view =
raft::make_device_vector_view<MathT, ix_t>(vq_centers.data_handle(), dim);
raft::stats::mean(res, vq_trainset_view, vq_centers_view);
} else {
auto vq_centers_view =
raft::make_device_matrix_view<MathT, ix_t>(vq_centers.data_handle(), vq_n_centers, dim);
cuvs::cluster::kmeans::balanced_params kmeans_params;
kmeans_params.n_iters = params.kmeans_n_iters;
kmeans_params.metric = cuvs::distance::DistanceType::L2Expanded;
cuvs::cluster::kmeans::fit(res, kmeans_params, vq_trainset_view, vq_centers_view);
}
return vq_centers;
}

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