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fix cuda arg reduce

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This commit is contained in:
Awni Hannun 2025-06-14 06:16:09 -07:00
parent a6d780154f
commit c353af5998
1 changed files with 2 additions and 3 deletions
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5
mlx/backend/cuda/arg_reduce.cu
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@ -1,5 +1,4 @@
// Copyright © 2025 Apple Inc.
#include "mlx/backend/common/utils.h"
#include "mlx/backend/cuda/device.h"
#include "mlx/backend/cuda/iterators/strided_iterator.cuh"
@ -113,7 +112,7 @@ __global__ void arg_reduce_general(
for (int r = 0; r < cuda::ceil_div(axis_size, BLOCK_DIM * N_READS); ++r) {
T vals[N_READS];
auto tid = r * BLOCK_DIM + block.thread_index().z;
auto tid = r * BLOCK_DIM + block.thread_index().x;
cub::LoadDirectBlocked(
tid, strided_iterator(in + in_idx, axis_stride), vals, axis_size, init);
best = op.reduce_many(best, vals, tid * N_READS);
@ -158,7 +157,7 @@ void ArgReduce::eval_gpu(const std::vector<array>& inputs, array& out) {
constexpr uint32_t N_READS = 4;
MLX_SWITCH_BLOCK_DIM(cuda::ceil_div(axis_size, N_READS), BLOCK_DIM, {
dim3 num_blocks = get_2d_grid_dims(out.shape(), out.strides());
dim3 block_dims{1, 1, BLOCK_DIM};
dim3 block_dims{BLOCK_DIM, 1, 1};
auto kernel = &cu::arg_reduce_general<
InType,
cu::ArgMax<InType>,