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fix: for balanced kmeans use grid.x for adjust_centers to avoid grid.y overflow #1

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fix: for balanced kmeans use grid.x for adjust_centers to avoid grid.y overflow #1

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4 changes: 2 additions & 2 deletions cpp/src/cluster/detail/kmeans_balanced.cuh
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Original file line number Diff line number Diff line change
Expand Up @@ -511,7 +511,7 @@ __launch_bounds__((raft::WarpSize * BlockDimY)) RAFT_KERNEL
IdxT* count,
MappingOpT mapping_op)
{
IdxT l = threadIdx.y + BlockDimY * static_cast<IdxT>(blockIdx.y);
IdxT l = threadIdx.y + BlockDimY * static_cast<IdxT>(blockIdx.x);
if (l >= n_clusters) return;
auto csize = static_cast<IdxT>(cluster_sizes[l]);
// skip big clusters
Expand Down Expand Up @@ -616,7 +616,7 @@ auto adjust_centers(MathT* centers,

constexpr uint32_t kBlockDimY = 4;
const dim3 block_dim(raft::WarpSize, kBlockDimY, 1);
const dim3 grid_dim(1, raft::ceildiv(n_clusters, static_cast<IdxT>(kBlockDimY)), 1);
const dim3 grid_dim(raft::ceildiv(n_clusters, static_cast<IdxT>(kBlockDimY)), 1, 1);
rmm::device_scalar<IdxT> update_count(0, stream, device_memory);
adjust_centers_kernel<kBlockDimY><<<grid_dim, block_dim, 0, stream>>>(centers,
n_clusters,
Expand Down