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support attention bwd

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Signed-off-by: Jinjie Liu <jjliu@baai.ac.cn>
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Jinjie Liu
2026-02-10 17:01:28 +08:00
parent e41ec26329
commit 599957e156
6 changed files with 206 additions and 26 deletions
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examples/attention/attnbwdpre.cc Normal file
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#include "ATen/core/ATen_fwd.h"
#include "ATen/ops/empty.h"
#include "torch/headeronly/core/DeviceType.h"
#include "tvm/ffi/container/tensor.h"
#include <ATen/DLConvertor.h>
#include <ATen/dlpack.h>
#include <tvm/ffi/extra/cuda/cubin_launcher.h>
#include <tvm/ffi/function.h>
#include <tvm/ffi/tvm_ffi.h>
#ifndef _ATTN_BWD_PREPROCESS_STUB
#define _ATTN_BWD_PREPROCESS_STUB(grid, device, stream, args, kwargs)
#endif
#ifndef _ATTN_BWD_PREPROCESS_TVM_FFI_NAME
#define _ATTN_BWD_PREPROCESS_TVM_FFI_NAME ""
#endif
tvm::ffi::Tensor AttnBwdPreprocess(tvm::ffi::Tensor o, tvm::ffi::Tensor do_,
tvm::ffi::Shape mshape,
const int32_t kHeadDim) {
const int32_t kBatch = mshape[0], kNHead = mshape[1], kNCtx = mshape[2],
kPreBlock = 128;
at::Tensor deltaTorch = at::empty(mshape, at::kFloat, std::nullopt,
at::Device(at::kCUDA, o.device().device_id),
std::nullopt, std::nullopt);
tvm::ffi::Tensor delta =
tvm::ffi::Tensor::FromDLPack(at::toDLPack(deltaTorch));
tvm::ffi::Tuple<int32_t, int32_t, int32_t> grid(kNCtx / kPreBlock,
kBatch * kNHead, 1);
tvm::ffi::Array<tvm::ffi::Any> args = {o, do_, delta, kBatch, kNHead, kNCtx};
tvm::ffi::Map<tvm::ffi::String, tvm::ffi::Any> kwargs = {
{"BLOCK_M", kPreBlock},
{"HEAD_DIM", kHeadDim},
};
DLDevice device = o.device();
void *stream = TVMFFIEnvGetStream(device.device_type, device.device_id);
_ATTN_BWD_PREPROCESS_STUB(grid, device.device_id, stream, args, kwargs);
return delta;
}
TVM_FFI_STATIC_INIT_BLOCK() {
namespace refl = tvm::ffi::reflection;
refl::GlobalDef().def(_ATTN_BWD_PREPROCESS_TVM_FFI_NAME, AttnBwdPreprocess);
}