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[Kimi K2] dsv3_router_gemm supports NUM_EXPERTS == 384 (#8013)

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This commit is contained in:
Peter Pan
2025-08-01 22:01:24 +08:00
committed by GitHub
parent 46e9d1c7c1
commit 6bdd27861b
5 changed files with 188 additions and 30 deletions
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66
sgl-kernel/csrc/gemm/dsv3_router_gemm_entry.cu
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@@ -25,6 +25,10 @@
#include "cuda_runtime.h"
#include "utils.h"
static constexpr int DEFAULT_NUM_EXPERTS = 256;
static constexpr int KIMI_K2_NUM_EXPERTS = 384;
static constexpr int DEFAULT_HIDDEN_DIM = 7168;
template <typename T, int kNumTokens, int kNumExperts, int kHiddenDim>
void invokeRouterGemmFloatOutput(float* output, T const* mat_a, T const* mat_b, cudaStream_t stream);
@@ -91,12 +95,24 @@ void dsv3_router_gemm(
TORCH_CHECK(output.dim() == 2 && mat_a.dim() == 2 && mat_b.dim() == 2);
const int num_tokens = mat_a.size(0);
constexpr int num_experts = 256;
constexpr int hidden_dim = 7168;
const int num_experts = mat_b.size(0);
const int hidden_dim = mat_a.size(1);
TORCH_CHECK(mat_a.size(1) == mat_b.size(1), "mat_a and mat_b must have the same hidden_dim");
TORCH_CHECK(mat_a.size(1) == hidden_dim, "currently hidden_dim only supports 7168");
TORCH_CHECK(mat_b.size(0) == num_experts, "currently num_experts only supports 256");
TORCH_CHECK(
hidden_dim == DEFAULT_HIDDEN_DIM,
"Expected hidden_dim=",
DEFAULT_HIDDEN_DIM,
", but got hidden_dim=",
hidden_dim);
TORCH_CHECK(
num_experts == DEFAULT_NUM_EXPERTS || num_experts == KIMI_K2_NUM_EXPERTS,
"Expected num_experts=",
DEFAULT_NUM_EXPERTS,
" or num_experts=",
KIMI_K2_NUM_EXPERTS,
", but got num_experts=",
num_experts);
TORCH_CHECK(
num_tokens >= 1 && num_tokens <= 16, "currently num_tokens must be less than or equal to 16 for router_gemm");
TORCH_CHECK(mat_a.dtype() == torch::kBFloat16, "mat_a must be bf16");
@@ -110,18 +126,36 @@ void dsv3_router_gemm(
const cudaStream_t stream = at::cuda::getCurrentCUDAStream();
if (output.dtype() == torch::kFloat32) {
LoopUnroller<1, 16, num_experts, hidden_dim>::unroll_float_output(
num_tokens,
reinterpret_cast<float*>(output.mutable_data_ptr()),
reinterpret_cast<__nv_bfloat16 const*>(mat_a.data_ptr()),
reinterpret_cast<__nv_bfloat16 const*>(mat_b.data_ptr()),
stream);
if (num_experts == DEFAULT_NUM_EXPERTS) {
LoopUnroller<1, 16, DEFAULT_NUM_EXPERTS, DEFAULT_HIDDEN_DIM>::unroll_float_output(
num_tokens,
reinterpret_cast<float*>(output.mutable_data_ptr()),
reinterpret_cast<__nv_bfloat16 const*>(mat_a.data_ptr()),
reinterpret_cast<__nv_bfloat16 const*>(mat_b.data_ptr()),
stream);
} else if (num_experts == KIMI_K2_NUM_EXPERTS) {
LoopUnroller<1, 16, KIMI_K2_NUM_EXPERTS, DEFAULT_HIDDEN_DIM>::unroll_float_output(
num_tokens,
reinterpret_cast<float*>(output.mutable_data_ptr()),
reinterpret_cast<__nv_bfloat16 const*>(mat_a.data_ptr()),
reinterpret_cast<__nv_bfloat16 const*>(mat_b.data_ptr()),
stream);
}
} else if (output.dtype() == torch::kBFloat16) {
LoopUnroller<1, 16, num_experts, hidden_dim>::unroll_bf16_output(
num_tokens,
reinterpret_cast<__nv_bfloat16*>(output.mutable_data_ptr()),
reinterpret_cast<__nv_bfloat16 const*>(mat_a.data_ptr()),
reinterpret_cast<__nv_bfloat16 const*>(mat_b.data_ptr()),
stream);
if (num_experts == DEFAULT_NUM_EXPERTS) {
LoopUnroller<1, 16, DEFAULT_NUM_EXPERTS, DEFAULT_HIDDEN_DIM>::unroll_bf16_output(
num_tokens,
reinterpret_cast<__nv_bfloat16*>(output.mutable_data_ptr()),
reinterpret_cast<__nv_bfloat16 const*>(mat_a.data_ptr()),
reinterpret_cast<__nv_bfloat16 const*>(mat_b.data_ptr()),
stream);
} else if (num_experts == KIMI_K2_NUM_EXPERTS) {
LoopUnroller<1, 16, KIMI_K2_NUM_EXPERTS, DEFAULT_HIDDEN_DIM>::unroll_bf16_output(
num_tokens,
reinterpret_cast<__nv_bfloat16*>(output.mutable_data_ptr()),
reinterpret_cast<__nv_bfloat16 const*>(mat_a.data_ptr()),
reinterpret_cast<__nv_bfloat16 const*>(mat_b.data_ptr()),
stream);
}
}
}