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Unfold2d.cpp
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#include <ATen/Parallel.h>
#include <ATen/cpu/vec/vec.h>
#include <ATen/native/Unfold2d.h>
#include <ATen/native/cpu/Loops.h>
#include <c10/util/irange.h>
#include <cmath>
namespace at {
namespace native {
namespace {
template <typename scalar_t>
static inline void cadd(
scalar_t* z,
const scalar_t* x,
const scalar_t* y,
int64_t n) {
using Vec = vec::Vectorized<scalar_t>;
// NOLINTNEXTLINE(modernize-avoid-c-arrays,cppcoreguidelines-avoid-c-arrays)
char* ptrs[] = {reinterpret_cast<char*>(z),
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-const-cast)
reinterpret_cast<char*>(const_cast<scalar_t*>(x)),
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-const-cast)
reinterpret_cast<char*>(const_cast<scalar_t*>(y))};
vectorized_loop(
ptrs,
n,
-1,
[](scalar_t x, scalar_t y) -> scalar_t { return x + y; },
[](Vec x, Vec y) -> Vec { return x + y; });
}
template <typename scalar_t>
static void unfolded2d_acc(
scalar_t* finput_data,
scalar_t* input_data,
int64_t kH,
int64_t kW,
int64_t dH,
int64_t dW,
int64_t padH,
int64_t padW,
int64_t n_input_plane,
int64_t input_height,
int64_t input_width,
int64_t output_height,
int64_t output_width) {
at::parallel_for(0, n_input_plane, 0, [&](int64_t start, int64_t end) {
for (const auto nip : c10::irange(start, end)) {
// NOLINTNEXTLINE(cppcoreguidelines-init-variables)
int64_t kw, kh, y, x;
// NOLINTNEXTLINE(cppcoreguidelines-init-variables)
int64_t ix, iy;
for (kh = 0; kh < kH; kh++) {
for (kw = 0; kw < kW; kw++) {
scalar_t* src = finput_data +
nip * ((size_t)kH * kW * output_height * output_width) +
kh * ((size_t)kW * output_height * output_width) +
kw * ((size_t)output_height * output_width);
scalar_t* dst =
input_data + nip * ((size_t)input_height * input_width);
if (padW > 0 || padH > 0) {
// NOLINTNEXTLINE(cppcoreguidelines-init-variables)
int64_t lpad, rpad;
for (y = 0; y < output_height; y++) {
iy = (int64_t)y * dH - padH + kh;
if (iy < 0 || iy >= input_height) {
} else {
if (dW == 1) {
ix = 0 - padW + kw;
lpad = std::max<int64_t>(0, padW - kw);
rpad = std::max<int64_t>(0, padW - (kW - kw - 1));
scalar_t* dst_slice =
dst + (size_t)iy * input_width + ix + lpad;
cadd(
dst_slice,
dst_slice,
src + (size_t)y * output_width + lpad,
output_width - lpad - rpad);
} else {
for (x = 0; x < output_width; x++) {
ix = (int64_t)x * dW - padW + kw;
if (ix < 0 || ix >= input_width) {
} else {
scalar_t* dst_slice = dst + (size_t)iy * input_width + ix;
*dst_slice = *dst_slice + src[(size_t)y * output_width + x];
}
}
}
}
}
} else {
for (y = 0; y < output_height; y++) {
iy = (int64_t)y * dH + kh;
ix = 0 + kw;
if (dW == 1) {
scalar_t* dst_slice = dst + (size_t)iy * input_width + ix;
cadd(
dst_slice,
dst_slice,
src + (size_t)y * output_width,
output_width);
} else {
for (x = 0; x < output_width; x++) {
scalar_t* dst_slice =
dst + (size_t)iy * input_width + ix + x * dW;
*dst_slice = *dst_slice + src[(size_t)y * output_width + x];
}
}
}
}
}
}
}
});
}
/* note: due to write issues, this one cannot be parallelized as well as
* unfolded2d_copy */
void unfolded2d_acc_kernel(
ScalarType dtype,
void *finput_data,
void *input_data,
int64_t kH,
int64_t kW,
int64_t dH,
int64_t dW,
int64_t padH,
int64_t padW,
int64_t n_input_plane,
int64_t input_height,
int64_t input_width,
int64_t output_height,
int64_t output_width) {
// This function assumes that
// output_height*dH does not overflow a int64_t
// output_width*dW does not overflow a int64_t
AT_DISPATCH_FLOATING_TYPES_AND(
at::ScalarType::BFloat16, dtype, "unfolded2d_acc", [&] {
unfolded2d_acc(
static_cast<scalar_t*>(finput_data),
static_cast<scalar_t*>(input_data),
kH,
kW,
dH,
dW,
padH,
padW,
n_input_plane,
input_height,
input_width,
output_height,
output_width);
});
}
template <typename scalar_t>
static void unfolded2d_copy(
scalar_t* input_data,
scalar_t* finput_data,
int64_t kH,
int64_t kW,
int64_t dH,
int64_t dW,
int64_t padH,
int64_t padW,
int64_t n_input_plane,
int64_t input_height,
int64_t input_width,
int64_t output_height,
int64_t output_width) {
at::parallel_for(
0, (int64_t)n_input_plane * kH * kW, 0, [&](int64_t start, int64_t end) {
for (const auto k : c10::irange(start, end)) {
int64_t nip = k / (kH * kW);
int64_t rest = k % (kH * kW);
int64_t kh = rest / kW;
int64_t kw = rest % kW;
// NOLINTNEXTLINE(cppcoreguidelines-init-variables)
int64_t x, y;
// NOLINTNEXTLINE(cppcoreguidelines-init-variables)
int64_t ix, iy;
scalar_t* dst = finput_data +
nip * ((size_t)kH * kW * output_height * output_width) +
kh * ((size_t)kW * output_height * output_width) +
kw * ((size_t)output_height * output_width);
scalar_t* src =
input_data + nip * ((size_t)input_height * input_width);
if (padW > 0 || padH > 0) {
// NOLINTNEXTLINE(cppcoreguidelines-init-variables)
int64_t lpad, rpad;
for (y = 0; y < output_height; y++) {
iy = (int64_t)y * dH - padH + kh;
if (iy < 0 || iy >= input_height) {
memset(
dst + (size_t)y * output_width,
0,
sizeof(scalar_t) * output_width);
} else {
if (dW == 1) {
ix = 0 - padW + kw;
lpad = std::max<int64_t>(0, padW - kw);
rpad = std::max<int64_t>(0, padW - (kW - kw - 1));
if (output_width - rpad - lpad <= 0) {
memset(
dst + (size_t)y * output_width,
0,
sizeof(scalar_t) * output_width);
} else {
if (lpad > 0)
memset(
dst + (size_t)y * output_width,
0,
sizeof(scalar_t) * lpad);
memcpy(
dst + (size_t)y * output_width + lpad,
src + (size_t)iy * input_width + ix + lpad,
sizeof(scalar_t) * (output_width - rpad - lpad));
if (rpad > 0)
memset(
dst + (size_t)y * output_width + output_width - rpad,
0,
sizeof(scalar_t) * rpad);
}
} else {
for (x = 0; x < output_width; x++) {
ix = (int64_t)x * dW - padW + kw;
if (ix < 0 || ix >= input_width)
memset(
dst + (size_t)y * output_width + x,
0,
sizeof(scalar_t) * 1);
else
memcpy(
dst + (size_t)y * output_width + x,
src + (size_t)iy * input_width + ix,
sizeof(scalar_t) * (1));
}
}
}
}
} else {
for (y = 0; y < output_height; y++) {
iy = (int64_t)y * dH + kh;
ix = 0 + kw;
if (dW == 1)
memcpy(
dst + (size_t)y * output_width,
src + (size_t)iy * input_width + ix,
sizeof(scalar_t) * output_width);
else {
for (x = 0; x < output_width; x++)
memcpy(
dst + (size_t)y * output_width + x,
src + (size_t)iy * input_width + ix + (int64_t)x * dW,
sizeof(scalar_t) * (1));
}
}
}
}
});
}
void unfolded2d_copy_kernel(
ScalarType dtype,
void *finput_data,
void *input_data,
int64_t kH,
int64_t kW,
int64_t dH,
int64_t dW,
int64_t padH,
int64_t padW,
int64_t n_input_plane,
int64_t input_height,
int64_t input_width,
int64_t output_height,
int64_t output_width) {
// This function assumes that
// kH*kW does not overflow an int
// n_input_plane*kH*kW does not overflow a int64_t
// output_height*dH does not overflow a int64_t
// output_width*dW does not overflow a int64_t
AT_DISPATCH_ALL_TYPES_AND(
at::ScalarType::BFloat16, dtype, "unfolded2d_copy", [&] {
unfolded2d_copy(
static_cast<scalar_t*>(input_data),
static_cast<scalar_t*>(finput_data),
kH,
kW,
dH,
dW,
padH,
padW,
n_input_plane,
input_height,
input_width,
output_height,
output_width);
});
}
} // namespace
REGISTER_DISPATCH(unfolded2d_copy_stub, &unfolded2d_copy_kernel);
REGISTER_DISPATCH(unfolded2d_acc_stub, &unfolded2d_acc_kernel);
} // namespace native
} // namespace at