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// from https://github.com/rosinality/stylegan2-pytorch/blob/master/op/fused_bias_act_kernel.cu
// Copyright (c) 2019, NVIDIA Corporation. All rights reserved.
//
// This work is made available under the Nvidia Source Code License-NC.
// To view a copy of this license, visit
// https://nvlabs.github.io/stylegan2/license.html
#include <torch/types.h>
#include <ATen/ATen.h>
#include <ATen/AccumulateType.h>
#include <ATen/cuda/CUDAContext.h>
#include <ATen/cuda/CUDAApplyUtils.cuh>
#include <cuda.h>
#include <cuda_runtime.h>
template <typename scalar_t>
static __global__ void fused_bias_act_kernel(scalar_t* out, const scalar_t* p_x, const scalar_t* p_b, const scalar_t* p_ref,
int act, int grad, scalar_t alpha, scalar_t scale, int loop_x, int size_x, int step_b, int size_b, int use_bias, int use_ref) {
int xi = blockIdx.x * loop_x * blockDim.x + threadIdx.x;
scalar_t zero = 0.0;
for (int loop_idx = 0; loop_idx < loop_x && xi < size_x; loop_idx++, xi += blockDim.x) {
scalar_t x = p_x[xi];
if (use_bias) {
x += p_b[(xi / step_b) % size_b];
}
scalar_t ref = use_ref ? p_ref[xi] : zero;
scalar_t y;
switch (act * 10 + grad) {
default:
case 10: y = x; break;
case 11: y = x; break;
case 12: y = 0.0; break;
case 30: y = (x > 0.0) ? x : x * alpha; break;
case 31: y = (ref > 0.0) ? x : x * alpha; break;
case 32: y = 0.0; break;
}
out[xi] = y * scale;
}
}
torch::Tensor fused_bias_act_op(const torch::Tensor& input, const torch::Tensor& bias, const torch::Tensor& refer,
int act, int grad, float alpha, float scale) {
int curDevice = -1;
cudaGetDevice(&curDevice);
cudaStream_t stream = at::cuda::getCurrentCUDAStream(curDevice);
auto x = input.contiguous();
auto b = bias.contiguous();
auto ref = refer.contiguous();
int use_bias = b.numel() ? 1 : 0;
int use_ref = ref.numel() ? 1 : 0;
int size_x = x.numel();
int size_b = b.numel();
int step_b = 1;
for (int i = 1 + 1; i < x.dim(); i++) {
step_b *= x.size(i);
}
int loop_x = 4;
int block_size = 4 * 32;
int grid_size = (size_x - 1) / (loop_x * block_size) + 1;
auto y = torch::empty_like(x);
AT_DISPATCH_FLOATING_TYPES_AND_HALF(x.scalar_type(), "fused_bias_act_kernel", [&] {
fused_bias_act_kernel<scalar_t><<<grid_size, block_size, 0, stream>>>(
y.data_ptr<scalar_t>(),
x.data_ptr<scalar_t>(),
b.data_ptr<scalar_t>(),
ref.data_ptr<scalar_t>(),
act,
grad,
alpha,
scale,
loop_x,
size_x,
step_b,
size_b,
use_bias,
use_ref
);
});
return y;
}
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