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feat: full FP4 activations for mxf4nvf4 - E2M1 packed A side + UE4M3 scales

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mxf4nvf4 requires BOTH A and B to be FP4 (E2M1 packed).
Changes:
- a_dtype_t: float_e4m3_t → float_e2m1_unpacksmem_t
- UMMA_K: 32 → 64 (FP4 MMA atom)
- L1 epilogue: FP8 quant → E2M1 FP4 quantization with nearest-neighbor
- L1 output SMEM: packed E2M1 (2 per byte), TMA store uint8
- TMA descriptors: adjusted for FP4 packing (K/2 bytes per row)
- SymmBuffer: uint8 activations, shape (M, K//2)
- Staging kernel: BF16 → E2M1 packed + UE4M3 block16 scales
This commit is contained in:
biondizzle
2026-05-11 20:29:08 +00:00
parent 2cd86ff5e7
commit b3d1aae038
4 changed files with 106 additions and 61 deletions
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28
csrc/apis/mega_nvfp4.hpp
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@@ -26,10 +26,11 @@ get_symm_buffer_size_for_nvfp4_mega_moe(
// Workspace bytes
const auto workspace = layout::Workspace(nullptr, num_ranks, num_experts, num_max_tokens_per_rank, num_topk);
// NVFP4 layouts: group_size=16, so SF stride is K/16 (twice as many as MXFP4)
const auto fp8_token_layout = layout::Data(hidden);
// NVFP4 layouts: E2M1 packed (2 per byte), so token layout is K/2 bytes
// group_size=16, so SF stride is K/16 (twice as many as MXFP4)
const auto fp4_token_layout = layout::Data(hidden / 2);
const auto bf16_token_layout = layout::Data(hidden * 2);
const auto fp8_intermediate_token_layout = layout::Data(intermediate_hidden);
const auto fp4_intermediate_token_layout = layout::Data(intermediate_hidden / 2);
const auto nvfp4_sf_layout = layout::Data(hidden / 16);
const auto nvfp4_intermediate_sf_layout = layout::Data(intermediate_hidden / 16);
const auto input_topk_idx_layout = layout::Data(num_topk * sizeof(int64_t), false);
@@ -38,7 +39,7 @@ get_symm_buffer_size_for_nvfp4_mega_moe(
// Input buffers
const auto input_token_buffer = layout::Buffer(
fp8_token_layout, 1, num_max_tokens_per_rank,
fp4_token_layout, 1, num_max_tokens_per_rank,
workspace.get_end_ptr());
const auto input_sf_buffer = layout::Buffer(
nvfp4_sf_layout, 1, num_max_tokens_per_rank,
@@ -62,7 +63,7 @@ get_symm_buffer_size_for_nvfp4_mega_moe(
// L1 input buffer
const auto l1_token_buffer = layout::Buffer(
fp8_token_layout, 1, num_max_pool_tokens,
fp4_token_layout, 1, num_max_pool_tokens,
input_topk_weights_buffer.get_end_ptr());
const auto l1_sf_buffer = layout::Buffer(
nvfp4_sf_layout, 1, num_max_padded_sf_pool_tokens,
@@ -73,7 +74,7 @@ get_symm_buffer_size_for_nvfp4_mega_moe(
// L2 input buffer
const auto l2_token_buffer = layout::Buffer(
fp8_intermediate_token_layout, 1, num_max_pool_tokens,
fp4_intermediate_token_layout, 1, num_max_pool_tokens,
l1_topk_weights_buffer.get_end_ptr());
const auto l2_sf_buffer = layout::Buffer(
nvfp4_intermediate_sf_layout, 1, num_max_padded_sf_pool_tokens,
@@ -91,10 +92,11 @@ get_symm_buffer_size_for_nvfp4_mega_moe(
// Slice function
auto slice_input_buffers = [=](const torch::Tensor& buffer) {
// NVFP4: E2M1 packed activations (2 per byte), K/2 bytes per token
auto x = torch::from_blob(
math::advance_ptr(buffer.data_ptr(), reinterpret_cast<int64_t>(input_token_buffer.base)),
{num_max_tokens_per_rank, hidden},
torch::TensorOptions().dtype(torch::kFloat8_e4m3fn).device(buffer.device()));
{num_max_tokens_per_rank, hidden / 2},
torch::TensorOptions().dtype(torch::kUInt8).device(buffer.device()));
// NVFP4 SF: K/16 bytes per token, packed as K/64 int32
auto x_sf = torch::from_blob(
math::advance_ptr(buffer.data_ptr(), reinterpret_cast<int64_t>(input_sf_buffer.base)),
@@ -108,20 +110,22 @@ get_symm_buffer_size_for_nvfp4_mega_moe(
math::advance_ptr(buffer.data_ptr(), reinterpret_cast<int64_t>(input_topk_weights_buffer.base)),
{num_max_tokens_per_rank, num_topk},
torch::TensorOptions().dtype(torch::kFloat32).device(buffer.device()));
// NVFP4: L1 output acts are E2M1 packed, intermediate_hidden/2 bytes
auto l1_acts = torch::from_blob(
math::advance_ptr(buffer.data_ptr(), reinterpret_cast<int64_t>(l1_token_buffer.base)),
{num_max_pool_tokens, hidden},
torch::TensorOptions().dtype(torch::kFloat8_e4m3fn).device(buffer.device()));
{num_max_pool_tokens, hidden / 2},
torch::TensorOptions().dtype(torch::kUInt8).device(buffer.device()));
// NVFP4 L1 SF: M-major, K/64 int32
auto l1_acts_sf = torch::from_blob(
math::advance_ptr(buffer.data_ptr(), reinterpret_cast<int64_t>(l1_sf_buffer.base)),
{num_max_padded_sf_pool_tokens, hidden / 64},
{1, num_max_padded_sf_pool_tokens},
torch::TensorOptions().dtype(torch::kInt).device(buffer.device()));
// NVFP4: L2 acts are E2M1 packed, intermediate_hidden/2 bytes
auto l2_acts = torch::from_blob(
math::advance_ptr(buffer.data_ptr(), reinterpret_cast<int64_t>(l2_token_buffer.base)),
{num_max_pool_tokens, intermediate_hidden},
torch::TensorOptions().dtype(torch::kFloat8_e4m3fn).device(buffer.device()));
{num_max_pool_tokens, intermediate_hidden / 2},
torch::TensorOptions().dtype(torch::kUInt8).device(buffer.device()));
// NVFP4 L2 SF: M-major, K/64 int32
auto l2_acts_sf = torch::from_blob(
math::advance_ptr(buffer.data_ptr(), reinterpret_cast<int64_t>(l2_sf_buffer.base)),