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[BugFix] Accuracy fix for llama4 int4 - improperly casted scales (#16801)

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Signed-off-by: Lucas Wilkinson <lwilkinson@neuralmagic.com>
This commit is contained in:
Lucas Wilkinson 2025-04-18 01:13:29 -04:00 committed by GitHub
parent 6a0f547561
commit 7eb4255628
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GPG Key ID: B5690EEEBB952194
3 changed files with 6 additions and 9 deletions
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10
csrc/moe/moe_wna16.cu
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@ -13,7 +13,6 @@
template <typename scalar_t, int bit, int GROUPS>
__global__ void moe_wna16_gemm_kernel(
const scalar_t* __restrict__ input, scalar_t* __restrict__ output,
const uint32_t* __restrict__ qweight, const scalar_t* __restrict__ scales,
const uint32_t* __restrict__ qzeros,
@ -54,8 +53,6 @@ __global__ void moe_wna16_gemm_kernel(
if (token_index / top_k >= size_m) break;
num_valid_tokens = m + 1;
if (blockIdx.z == 0 && offset_n < size_n)
output[token_index * size_n + offset_n] = Dtype::int2num(0);
if (expert_id != -1) {
int k_per_thread = DIVIDE(BLOCK_SIZE_K, BLOCK_SIZE_N);
@ -284,8 +281,7 @@ torch::Tensor moe_wna16_gemm(torch::Tensor input, torch::Tensor output,
int64_t BLOCK_SIZE_M, int64_t BLOCK_SIZE_N,
int64_t BLOCK_SIZE_K, int64_t bit) {
const at::cuda::OptionalCUDAGuard device_guard(device_of(input));
auto options =
torch::TensorOptions().dtype(input.dtype()).device(input.device());
output.zero_();
const int num_experts = b_qweight.size(0);
const int size_m = input.size(0);
@ -302,9 +298,9 @@ torch::Tensor moe_wna16_gemm(torch::Tensor input, torch::Tensor output,
const uint32_t* b_qzeros_ptr;
if (b_qzeros.has_value())
b_qzeros_ptr = (const uint32_t*)b_qzeros.value().data_ptr<uint8_t>();
const float* topk_weights_ptr;
const float* topk_weights_ptr = nullptr;
if (topk_weights.has_value())
topk_weights_ptr = (const float*)topk_weights.value().data_ptr();
topk_weights_ptr = (const float*)topk_weights.value().data_ptr<float>();
int groups_per_block_row = BLOCK_SIZE_K / group_size;
TORCH_CHECK(bit == 4 || bit == 8, "bit must be 4 or 8");

1
vllm/model_executor/layers/fused_moe/layer.py
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@ -422,6 +422,7 @@ class FusedMoE(torch.nn.Module):
if params_dtype is None:
params_dtype = torch.get_default_dtype()
self.params_dtype = params_dtype
# Note: here we guard against accessing the TP and DP groups when
# uninitialized (this happens when testing)

4
vllm/model_executor/models/llama4.py
View File

@ -51,8 +51,8 @@ class Llama4MoE(nn.Module):
renormalize: bool,
) -> Tuple[torch.Tensor, torch.Tensor]:
router_scores, router_indices = fast_topk(gating_output, topk, dim=-1)
router_scores = torch.sigmoid(router_scores.float()).to(
hidden_states.dtype)
# psuedo-standard is that the router scores are floats
router_scores = torch.sigmoid(router_scores.float())
return (router_scores, router_indices.to(torch.int32))
def __init__(self,