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#include "caffe2/operators/reciprocal_op.h"
#include <algorithm>
#include <functional>
#include "caffe2/core/context_gpu.h"
namespace caffe2 {
namespace {
template <typename T>
__global__ void
ReciprocalGradientCUDAKernel(const int N, const T* dY, const T* Y, T* dX) {
CUDA_1D_KERNEL_LOOP(i, N) {
#if __CUDA_ARCH__ >= 350
dX[i] = __ldg(dY + i) * (-__ldg(Y + i) * __ldg(Y + i));
#else
dX[i] = dY[i] * (-Y[i] * Y[i]);
#endif
}
}
} // namespace
template <>
template <typename T>
bool ReciprocalGradientFunctor<CUDAContext>::Forward(
const std::vector<int>& Y_dims,
const std::vector<int>& /* dY_dims */,
const T* Y,
const T* dY,
T* dX,
CUDAContext* context) const {
const int size = std::accumulate(
Y_dims.cbegin(), Y_dims.cend(), 1, std::multiplies<int>());
ReciprocalGradientCUDAKernel<T>
<<<CAFFE_GET_BLOCKS(size),
CAFFE_CUDA_NUM_THREADS,
0,
context->cuda_stream()>>>(size, dY, Y, dX);
C10_CUDA_KERNEL_LAUNCH_CHECK();
return true;
}
REGISTER_CUDA_OPERATOR(
Reciprocal,
UnaryElementwiseOp<
TensorTypes<float, double>,
CUDAContext,
ReciprocalFunctor<CUDAContext>>);
REGISTER_CUDA_OPERATOR(
ReciprocalGradient,
BinaryElementwiseOp<
TensorTypes<float, double>,
CUDAContext,
ReciprocalGradientFunctor<CUDAContext>>);
} // namespace caffe2
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