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paddlepaddle--paddle/paddle/phi/kernels/funcs/fast_ln_v2_bwd_kernel.cu
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// Copyright (c) 2025 PaddlePaddle Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved. */
/*This code is copied from NVIDIA apex:
* https://github.com/NVIDIA/apex
* with minor changes. */
#include "paddle/phi/backends/gpu/cuda/cudnn_helper.h"
#include "paddle/phi/kernels/funcs/fast_ln_v2_common.h"
#include "paddle/phi/kernels/funcs/fast_ln_v2_utils.h"
namespace phi {
namespace funcs {
namespace fast_ln_v2 {
BwdRegistry FAST_LN_V2_BWD_FUNCS;
template <typename Ktraits>
__global__ __launch_bounds__(Ktraits::THREADS_PER_CTA) void ln_bwd_kernel(
fast_ln_v2::BwdParams params) {
#if defined(__CUDA_ARCH__) && (__CUDA_ARCH__ >= 700)
enum { ROWS_PER_CTA = Ktraits::ROWS_PER_CTA };
enum { WARPS_M = Ktraits::WARPS_M };
enum { WARPS_N = Ktraits::WARPS_N };
enum { THREADS_PER_ROW = Ktraits::THREADS_PER_ROW };
enum { COLS = Ktraits::COLS };
enum { BYTES_PER_ROW = Ktraits::BYTES_PER_ROW };
enum { LDGS = Ktraits::LDGS };
enum { NUM_ELTS = Ktraits::ELTS_PER_LDG };
enum { THREADS_PER_WARP = Ktraits::THREADS_PER_WARP };
enum { CTAS_PER_ROW = Ktraits::CTAS_PER_ROW };
using compute_t = typename Ktraits::compute_t;
using index_t = typename Ktraits::index_t;
using Ivec = typename Ktraits::Ivec;
using Ovec = typename Ktraits::Ovec;
using Wvec = typename Ktraits::Wvec;
using Cvec = typename Ktraits::Cvec;
using Reducer = typename Ktraits::Reducer;
using reduce_t = typename Reducer::Type;
extern __shared__ char smem_[];
const index_t tidx = threadIdx.x;
const index_t bidn = blockIdx.x % CTAS_PER_ROW;
const index_t bidm = blockIdx.x / CTAS_PER_ROW;
const index_t lane = tidx % THREADS_PER_WARP;
const index_t warp = tidx / THREADS_PER_WARP;
const index_t warp_m = warp / Ktraits::WARPS_N;
const index_t warp_n = warp % Ktraits::WARPS_N;
const index_t tid_r = warp_n * THREADS_PER_WARP + lane;
const index_t r = bidm * Ktraits::ROWS_PER_CTA + warp_m;
const index_t c = bidn * THREADS_PER_ROW + warp_n * THREADS_PER_WARP + lane;
static_assert(COLS == THREADS_PER_ROW * LDGS * NUM_ELTS * CTAS_PER_ROW);
Cvec dzy_sum[LDGS];
Cvec dz_sum[LDGS];
memset(dzy_sum, 0, sizeof(dzy_sum));
memset(dz_sum, 0, sizeof(dz_sum));
compute_t *smem_wgrad = reinterpret_cast<compute_t *>(smem_);
char *smem_dgrad = smem_ + Ktraits::SMEM_BYTES_WGRAD;
Reducer reducer(params, bidm, bidn, warp_m, warp_n, lane, smem_dgrad);
Sum<reduce_t> sum;
bool is_rmsnorm = (params.mean == nullptr);
constexpr float rn = 1.f / static_cast<float>(COLS);
Wvec gamma[LDGS];
index_t idx = c;
#pragma unroll
for (int it = 0; it < LDGS; it++) {
if (params.scale != nullptr) {
gamma[it].load_from(params.scale, idx);
} else {
gamma[it].init(1.0f);
}
idx += Ktraits::VEC_COLS_PER_LDG;
}
#pragma unroll 1
for (int row = r; row < params.rows;
row += params.ctas_per_col * ROWS_PER_CTA) {
const compute_t mu_r =
is_rmsnorm ? static_cast<compute_t>(0.)
: static_cast<const compute_t *>(params.mean)[row];
const compute_t rs_r = static_cast<const compute_t *>(params.invvar)[row];
Ivec x[LDGS];
Ovec dz[LDGS];
index_t idx = row * Ktraits::VEC_COLS + c;
#pragma unroll
for (int it = 0; it < LDGS; it++) {
dz[it].load_from(params.dy, idx);
x[it].load_from(params.x, idx);
idx += Ktraits::VEC_COLS_PER_LDG;
}
compute_t dy[LDGS * NUM_ELTS];
compute_t y[LDGS * NUM_ELTS];
compute_t mdy_local = 0.f;
compute_t mdyy_local = 0.f;
#pragma unroll
for (int it = 0; it < LDGS; it++) {
#pragma unroll
for (int jt = 0; jt < NUM_ELTS; jt++) {
compute_t x_tmp = x[it].data.elt[jt];
compute_t y_tmp = rs_r * (x_tmp - mu_r);
compute_t dy_tmp = compute_t(gamma[it].data.elt[jt]);
dy_tmp *= compute_t(dz[it].data.elt[jt]);
compute_t dz_tmp = dz[it].data.elt[jt];
mdy_local += dy_tmp;
mdyy_local += dy_tmp * y_tmp;
dy[it * NUM_ELTS + jt] = dy_tmp;
y[it * NUM_ELTS + jt] = y_tmp;
dzy_sum[it].data.elt[jt] += dz_tmp * y_tmp;
dz_sum[it].data.elt[jt] += dz_tmp;
}
}
reduce_t result = reducer.allreduce({mdy_local, mdyy_local}, sum);
if (is_rmsnorm) {
mdy_local = 0.f;
} else {
mdy_local = fast_ln_v2::Get<0>::of<reduce_t, compute_t>(result) * rn;
}
mdyy_local = fast_ln_v2::Get<1>::of<reduce_t, compute_t>(result) * rn;
Ivec dx[LDGS];
idx = row * Ktraits::VEC_COLS + c;
#pragma unroll
for (int it = 0; it < LDGS; it++) {
#pragma unroll
for (int jt = 0; jt < NUM_ELTS; jt++) {
compute_t dy_tmp = dy[it * NUM_ELTS + jt];
compute_t y_tmp = y[it * NUM_ELTS + jt];
compute_t dx_tmp = rs_r * (dy_tmp - (mdyy_local * y_tmp + mdy_local));
dx[it].data.elt[jt] = dx_tmp;
}
if (params.dx != nullptr) {
dx[it].store_to(params.dx, idx);
}
idx += Ktraits::VEC_COLS_PER_LDG;
}
} // end: grid stride loop
if (WARPS_M == 1) {
idx = r * Ktraits::VEC_COLS + c;
#pragma unroll
for (int it = 0; it < LDGS; it++) {
if (params.dbias != nullptr) {
dz_sum[it].store_to(params.dbias_part, idx);
}
dzy_sum[it].store_to(params.dscale_part, idx);
idx += Ktraits::VEC_COLS_PER_LDG;
}
} else {
static_assert(WARPS_M == 1 || Ktraits::CTAS_PER_ROW == 1,
"Multiple rows per CTA not supported for Multi-CTA.");
// Finalize reduction of part dgamma and dbeta for this CTA
// by reducing over the rows held across the WARPS_M warps
// Assumption: blockSize divides hidden size.
enum { NUM_RES = COLS / Ktraits::THREADS_PER_CTA };
static_assert(NUM_RES * Ktraits::THREADS_PER_CTA == COLS, "");
idx = warp_m * Ktraits::VEC_COLS + tid_r;
#pragma unroll
for (int it = 0; it < LDGS; it++) {
dz_sum[it].store_to(smem_wgrad, idx);
idx += THREADS_PER_ROW;
}
__syncthreads();
compute_t cta_dz_sum[NUM_RES];
memset(cta_dz_sum, 0, sizeof(compute_t) * NUM_RES);
for (int it = 0; it < ROWS_PER_CTA; it++) {
for (int jt = 0; jt < NUM_RES; jt++) {
cta_dz_sum[jt] +=
smem_wgrad[it * COLS + tidx + jt * Ktraits::THREADS_PER_CTA];
}
}
__syncthreads();
idx = warp_m * Ktraits::VEC_COLS + tid_r;
#pragma unroll
for (int it = 0; it < LDGS; it++) {
dzy_sum[it].store_to(smem_wgrad, idx);
idx += THREADS_PER_ROW;
}
__syncthreads();
compute_t cta_dzy_sum[NUM_RES];
memset(cta_dzy_sum, 0, sizeof(compute_t) * NUM_RES);
for (int it = 0; it < ROWS_PER_CTA; it++) {
for (int jt = 0; jt < NUM_RES; jt++) {
cta_dzy_sum[jt] +=
smem_wgrad[it * COLS + tidx + jt * Ktraits::THREADS_PER_CTA];
}
}
compute_t *dgamma_part =
(params.dscale_part != nullptr)
? static_cast<compute_t *>(params.dscale_part) + bidm * COLS + tidx
: nullptr;
if (dgamma_part != nullptr) {
for (int jt = 0; jt < NUM_RES; jt++) {
*dgamma_part = cta_dzy_sum[jt];
dgamma_part += Ktraits::THREADS_PER_CTA;
}
}
if (params.dbias != nullptr) {
compute_t *dbeta_part =
static_cast<compute_t *>(params.dbias_part) + bidm * COLS + tidx;
for (int jt = 0; jt < NUM_RES; jt++) {
*dbeta_part = cta_dz_sum[jt];
dbeta_part += Ktraits::THREADS_PER_CTA;
}
}
}
#endif
}
bool has_fast_ln_v2_bwd_kernel(DataType weight_type,
DataType input_type,
DataType output_type,
DataType compute_type,
uint32_t hidden_size) {
auto iter = FAST_LN_V2_BWD_FUNCS.find(
get_key(weight_type, input_type, output_type, compute_type, hidden_size));
return iter != FAST_LN_V2_BWD_FUNCS.end();
}
template <typename Kernel_traits>
__global__
__launch_bounds__(Kernel_traits::THREADS_PER_CTA) void ln_bwd_finalize_kernel(
BwdParams params) {
using compute_t = typename Kernel_traits::compute_t;
using weight_t = typename Kernel_traits::weight_t;
using index_t = typename Kernel_traits::index_t;
using Reducer = typename Kernel_traits::Reducer;
using reduce_t = typename Reducer::Type;
Sum<reduce_t> sum;
enum { NUM_ELT = Kernel_traits::ELTS_PER_LDG };
enum { THREADS_PER_WARP = Kernel_traits::THREADS_PER_WARP };
__shared__ char smem_[Kernel_traits::SMEM_BYTES_PER_CTA];
constexpr uint32_t bidm = 0;
const uint32_t bidn = blockIdx.x;
const uint32_t tidx = threadIdx.x;
const uint32_t warp = tidx / THREADS_PER_WARP;
const uint32_t lane = tidx % THREADS_PER_WARP;
Reducer reducer(params, bidm, bidn, 0, 0, lane, smem_);
const uint32_t c = bidn * THREADS_PER_WARP + lane;
const uint32_t c_out = bidn * THREADS_PER_WARP / 2 + lane;
constexpr uint32_t COL_STRIDE = Kernel_traits::CTAS * THREADS_PER_WARP;
for (uint32_t col = c, col_out = c_out; col < Kernel_traits::COLS;
col += COL_STRIDE, col_out += COL_STRIDE / 2) {
// Each thread sums over NUM_ELT columns.
Vec<compute_t, NUM_ELT> dbeta_local, dgamma_local;
memset(&dgamma_local, 0, sizeof(dgamma_local));
memset(&dbeta_local, 0, sizeof(dbeta_local));
for (uint32_t row = warp; row < params.ctas_per_col;
row += Kernel_traits::ROWS_PER_CTA) {
index_t idx = row * Kernel_traits::COLS + col;
Vec<compute_t, NUM_ELT> dbeta_part, dgamma_part;
if (params.dbias != nullptr) {
dbeta_part.load_from(params.dbias_part, idx);
} else {
dbeta_part.init(0.);
}
if (params.dscale_part != nullptr) {
dgamma_part.load_from(params.dscale_part, idx);
} else {
dgamma_part.init(0.);
}
#pragma unroll
for (int it = 0; it < NUM_ELT; it++) {
dgamma_local.data.elt[it] += (dgamma_part.data.elt[it]);
if (params.dbias != nullptr) {
dbeta_local.data.elt[it] += (dbeta_part.data.elt[it]);
}
}
}
void *smem_gamma = smem_;
void *smem_beta = &smem_[Kernel_traits::SMEM_BYTES_TRANSPOSE];
const int write_row = warp;
const int write_col = lane ^ write_row;
const int write_idx = write_row * THREADS_PER_WARP + write_col;
dgamma_local.store_to(smem_gamma, write_idx);
dbeta_local.store_to(smem_beta, write_idx);
__syncthreads();
// It would be probably safe to reuse the first row of smem_beta and
// smem_gamma
void *smem_gamma_out = &smem_[2 * Kernel_traits::SMEM_BYTES_TRANSPOSE];
void *smem_beta_out = &smem_[2 * Kernel_traits::SMEM_BYTES_TRANSPOSE +
Kernel_traits::SMEM_BYTES_OUTPUT];
// More than one iter iff ROWS_PER_CTA < 32.
for (int w = warp; w < THREADS_PER_WARP; w += Kernel_traits::ROWS_PER_CTA) {
const int read_row = lane;
const int read_col = w ^ read_row;
const int read_idx = read_row * THREADS_PER_WARP + read_col;
memset(&dbeta_local, 0, sizeof(dbeta_local));
memset(&dgamma_local, 0, sizeof(dgamma_local));
// Load beta and gamma transposed
if (read_row < Kernel_traits::ROWS_PER_CTA) {
dbeta_local.load_from(smem_beta, read_idx);
dgamma_local.load_from(smem_gamma, read_idx);
}
// Call reducer on the loaded value(s) and convert.
#pragma unroll
for (int it = 0; it < NUM_ELT; it++) {
compute_t b_i = dbeta_local.data.elt[it];
compute_t g_i = dgamma_local.data.elt[it];
b_i = reducer.allreduce(b_i, sum);
g_i = reducer.allreduce(g_i, sum);
dgamma_local.data.elt[it] = g_i;
dbeta_local.data.elt[it] = b_i;
}
// Leader stores the result at the current column.
if (lane == 0) {
dgamma_local.store_to(smem_gamma_out, w);
dbeta_local.store_to(smem_beta_out, w);
}
}
// All writes done.
__syncthreads();
// Pack and store: 2-wide stores with half the threads.
if (warp == Kernel_traits::ROWS_PER_CTA - 1 &&
lane < THREADS_PER_WARP / 2) {
using src_t = typename TypeToVec2<compute_t>::Type;
using dst_t = typename TypeToVec2<weight_t>::Type;
Vec<src_t, NUM_ELT> dbeta_vec2, dgamma_vec2;
Vec<dst_t, NUM_ELT> dbeta_out2, dgamma_out2;
dgamma_vec2.load_from(smem_gamma_out, lane);
dbeta_vec2.load_from(smem_beta_out, lane);
#pragma unroll
for (int it = 0; it < NUM_ELT; it++) {
dgamma_out2.data.elt[it] =
Converter<src_t, dst_t>::convert(dgamma_vec2.data.elt[it]);
dbeta_out2.data.elt[it] =
Converter<src_t, dst_t>::convert(dbeta_vec2.data.elt[it]);
}
if (params.dscale != nullptr) {
dgamma_out2.store_to(params.dscale, col_out);
}
if (params.dbias != nullptr) {
dbeta_out2.store_to(params.dbias, col_out);
}
}
}
}
template <typename weight_t,
typename input_t,
typename output_t,
typename compute_t,
typename index_t,
int HIDDEN_SIZE,
int CTAS_PER_ROW,
int WARPS_M,
int WARPS_N,
int BYTES_PER_LDG_MAIN,
int BYTES_PER_LDG_FINAL>
void launch_(LaunchParams<BwdParams> &launch_params, // NOLINT
const bool configure_params) {
using KernelTraits = KernelTraits<weight_t,
input_t,
output_t,
compute_t,
index_t,
HIDDEN_SIZE,
CTAS_PER_ROW,
WARPS_M,
WARPS_N,
BYTES_PER_LDG_MAIN>;
auto kernel = &ln_bwd_kernel<KernelTraits>;
if (configure_params) {
int ctas_per_sm;
cudaError status_ = cudaOccupancyMaxActiveBlocksPerMultiprocessor(
&ctas_per_sm,
kernel,
KernelTraits::THREADS_PER_CTA,
KernelTraits::SMEM_BYTES);
launch_params.params.ctas_per_col =
launch_params.props->multiProcessorCount * ctas_per_sm /
KernelTraits::CTAS_PER_ROW;
launch_params.barrier_size = 0;
launch_params.workspace_bytes = 0;
if (KernelTraits::CTAS_PER_ROW > 1) {
launch_params.barrier_size = 2 * launch_params.params.ctas_per_col;
launch_params.workspace_bytes =
launch_params.params.ctas_per_col * KernelTraits::WARPS_M *
KernelTraits::CTAS_PER_ROW * sizeof(typename KernelTraits::reduce_t) *
2;
}
return;
}
if (KernelTraits::SMEM_BYTES >= 48 * 1024) {
CHECK_CUDA(cudaFuncSetAttribute(kernel,
cudaFuncAttributeMaxDynamicSharedMemorySize,
KernelTraits::SMEM_BYTES));
}
auto stream = launch_params.stream;
auto ctas_per_col = launch_params.params.ctas_per_col;
if (KernelTraits::CTAS_PER_ROW == 1) {
kernel<<<ctas_per_col,
KernelTraits::THREADS_PER_CTA,
KernelTraits::SMEM_BYTES,
stream>>>(launch_params.params);
} else {
dim3 grid(KernelTraits::CTAS_PER_ROW * ctas_per_col);
dim3 block(KernelTraits::THREADS_PER_CTA);
void *params_ = (void *)&launch_params.params; // NOLINT
cudaLaunchCooperativeKernel((void *)kernel, // NOLINT
grid,
block,
(void **)&params_, // NOLINT
KernelTraits::SMEM_BYTES,
stream);
}
using KernelTraitsF =
fast_ln_v2::KernelTraitsFinalize<HIDDEN_SIZE,
weight_t,
input_t,
output_t,
compute_t,
index_t,
32 * 32, // THREADS_PER_CTA
BYTES_PER_LDG_FINAL>;
auto kernel_f = &fast_ln_v2::ln_bwd_finalize_kernel<KernelTraitsF>;
kernel_f<<<KernelTraitsF::CTAS, KernelTraitsF::THREADS_PER_CTA, 0, stream>>>(
launch_params.params);
}
// Create backward launch function and register. Macro signature:
// HIDDEN_SIZE, WTYPE, ITYPE, OTYPE, CTYPE, CTAS_PER_ROW, WARPS_M, WARPS_N,
// BYTES_PER_LDG, BYTES_PER_LDG_FINAL
#define REGISTER_BWD_LAUNCHER(HIDDEN_SIZE, \
WTYPE, \
ITYPE, \
OTYPE, \
CTYPE, \
CTAS_PER_ROW, \
WARPS_M, \
WARPS_N, \
BYTES_PER_LDG, \
BYTES_PER_LDG_FINALIZE) \
void ln_bwd_##HIDDEN_SIZE##_##WTYPE##_##ITYPE##_##OTYPE##_##CTYPE( \
LaunchParams<BwdParams> &launch_params, const bool configure_params) { \
launch_<WTYPE, \
ITYPE, \
OTYPE, \
CTYPE, \
uint32_t, \
HIDDEN_SIZE, \
CTAS_PER_ROW, \
WARPS_M, \
WARPS_N, \
BYTES_PER_LDG, \
BYTES_PER_LDG_FINALIZE>(launch_params, configure_params); \
} \
static BwdRegistrar<WTYPE, ITYPE, OTYPE, CTYPE, HIDDEN_SIZE> \
reg_##HIDDEN_SIZE##_##WTYPE##_##ITYPE##_##OTYPE##_##CTYPE( \
ln_bwd_##HIDDEN_SIZE##_##WTYPE##_##ITYPE##_##OTYPE##_##CTYPE)
#if CUDNN_VERSION_MIN(8, 1, 0) && CUDA_VERSION >= 12000
REGISTER_BWD_LAUNCHER(1536, fp32, fp32, fp32, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(1536, fp16, fp16, fp16, fp32, 1, 1, 4, 8, 4);
REGISTER_BWD_LAUNCHER(1536, fp16, fp32, fp16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(1536, bf16, bf16, bf16, fp32, 1, 1, 4, 8, 4);
REGISTER_BWD_LAUNCHER(1536, bf16, fp32, bf16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(2048, fp32, fp32, fp32, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(2048, fp16, fp16, fp16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(2048, fp16, fp32, fp16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(2048, bf16, bf16, bf16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(2048, bf16, fp32, bf16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(2304, fp32, fp32, fp32, fp32, 1, 1, 4, 8, 4);
REGISTER_BWD_LAUNCHER(2304, fp16, fp16, fp16, fp32, 1, 1, 4, 4, 4);
REGISTER_BWD_LAUNCHER(2304, fp16, fp32, fp16, fp32, 1, 1, 4, 8, 4);
REGISTER_BWD_LAUNCHER(2304, bf16, bf16, bf16, fp32, 1, 1, 4, 4, 4);
REGISTER_BWD_LAUNCHER(2304, bf16, fp32, bf16, fp32, 1, 1, 4, 8, 4);
REGISTER_BWD_LAUNCHER(3072, fp32, fp32, fp32, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(3072, fp16, fp16, fp16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(3072, fp16, fp32, fp16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(3072, bf16, bf16, bf16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(3072, bf16, fp32, bf16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(3840, fp32, fp32, fp32, fp32, 1, 1, 4, 8, 4);
REGISTER_BWD_LAUNCHER(3840, fp16, fp16, fp16, fp32, 1, 1, 4, 4, 4);
REGISTER_BWD_LAUNCHER(3840, fp16, fp32, fp16, fp32, 1, 1, 4, 8, 4);
REGISTER_BWD_LAUNCHER(3840, bf16, bf16, bf16, fp32, 1, 1, 4, 4, 4);
REGISTER_BWD_LAUNCHER(3840, bf16, fp32, bf16, fp32, 1, 1, 4, 8, 4);
REGISTER_BWD_LAUNCHER(4096, fp32, fp32, fp32, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(4096, fp16, fp16, fp16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(4096, fp16, fp32, fp16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(4096, bf16, bf16, bf16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(4096, bf16, fp32, bf16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(5120, fp32, fp32, fp32, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(5120, fp16, fp16, fp16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(5120, fp16, fp32, fp16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(5120, bf16, bf16, bf16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(5120, bf16, fp32, bf16, fp32, 1, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(6144, fp32, fp32, fp32, fp32, 1, 1, 8, 16, 4);
REGISTER_BWD_LAUNCHER(6144, fp16, fp16, fp16, fp32, 1, 1, 8, 16, 4);
REGISTER_BWD_LAUNCHER(6144, fp16, fp32, fp16, fp32, 1, 1, 8, 16, 4);
REGISTER_BWD_LAUNCHER(6144, bf16, bf16, bf16, fp32, 1, 1, 8, 16, 4);
REGISTER_BWD_LAUNCHER(6144, bf16, fp32, bf16, fp32, 1, 1, 8, 16, 4);
REGISTER_BWD_LAUNCHER(8192, fp32, fp32, fp32, fp32, 2, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(8192, fp16, fp16, fp16, fp32, 2, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(8192, fp16, fp32, fp16, fp32, 2, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(8192, bf16, bf16, bf16, fp32, 2, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(8192, bf16, fp32, bf16, fp32, 2, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(10240, fp32, fp32, fp32, fp32, 2, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(10240, fp16, fp16, fp16, fp32, 2, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(10240, fp16, fp32, fp16, fp32, 2, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(10240, bf16, bf16, bf16, fp32, 2, 1, 4, 16, 4);
REGISTER_BWD_LAUNCHER(10240, bf16, fp32, bf16, fp32, 2, 1, 4, 16, 4);
#endif // CUDNN_VERSION_MIN(8, 1, 0) && CUDA_VERSION >= 12000
BwdFunction &get_bwd_launcher(DataType weight_type,
DataType input_type,
DataType output_type,
DataType compute_type,
uint32_t hidden_size) {
auto iter = FAST_LN_V2_BWD_FUNCS.find(
get_key(weight_type, input_type, output_type, compute_type, hidden_size));
if (iter != FAST_LN_V2_BWD_FUNCS.end()) {
return iter->second;
} else {
PD_CHECK(false,
"BWD: Unsupported hidden_size or types: ",
hidden_size,
weight_type,
input_type,
output_type,
compute_type);
}
}
} // namespace fast_ln_v2
} // namespace funcs
} // namespace phi