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#include <algorithm>
#include "caffe2/core/context_gpu.h"
#include "caffe2/operators/boolean_unmask_ops.h"
namespace caffe2 {
namespace {
__global__ void ComputeIndicesKernel(
const int numMasks,
const int maskSize,
int* indices,
bool* const masks[]) {
CUDA_1D_KERNEL_LOOP(i, maskSize) {
for (int j = 0; j < numMasks; ++j) {
if (masks[j][i]) {
indices[i] = j;
return;
}
}
CUDA_KERNEL_ASSERT(false);
}
}
__global__ void FillValuesKernel(
const int numMasks,
const int maskSize,
const size_t itemSize,
const int* indices,
char* const values[],
int* valueSizes,
char* dest) {
CUDA_1D_KERNEL_LOOP(j, numMasks) {
int k = 0;
for (int i = 0; i < maskSize; ++i) {
if (indices[i] == j) {
for (int h = 0; h < itemSize; ++h) {
dest[i * itemSize + h] = values[j][k * itemSize + h];
}
++k;
}
}
CUDA_KERNEL_ASSERT(valueSizes[j] == k);
}
}
} // namespace
template <>
class BooleanUnmaskOp<CUDAContext> final : public Operator<CUDAContext> {
public:
BooleanUnmaskOp(const OperatorDef& def, Workspace* ws)
: Operator<CUDAContext>(def, ws) {}
bool RunOnDevice() override {
int maskSize = Input(0).numel();
int numMasks = InputSize() / 2;
const auto& meta = Input(1).meta();
auto* out = Output(0);
out->Resize(maskSize);
auto* dest = (char*)out->raw_mutable_data(meta);
ReinitializeTensor(&hostMasks_, {numMasks}, at::dtype<bool*>().device(CPU));
auto* hostMasksData = hostMasks_.mutable_data<bool*>();
ReinitializeTensor(
&hostValues_, {numMasks}, at::dtype<char*>().device(CPU));
auto* hostValuesData = hostValues_.mutable_data<char*>();
ReinitializeTensor(
&hostValueSizes_, {numMasks}, at::dtype<int>().device(CPU));
auto* hostValueSizesData = hostValueSizes_.mutable_data<int>();
for (int i = 0; i < numMasks; ++i) {
auto& mask = Input(i * 2);
CAFFE_ENFORCE_EQ(mask.dim(), 1);
CAFFE_ENFORCE_EQ(mask.numel(), maskSize);
hostMasksData[i] = const_cast<bool*>(mask.data<bool>());
const auto& value = Input(i * 2 + 1);
CAFFE_ENFORCE_EQ(value.dim(), 1);
hostValuesData[i] = (char*)value.raw_data();
hostValueSizesData[i] = value.numel();
}
masks_.CopyFrom(hostMasks_);
values_.CopyFrom(hostValues_);
valueSizes_.CopyFrom(hostValueSizes_);
ReinitializeTensor(&indices_, {maskSize}, at::dtype<int>().device(CUDA));
auto* indicesData = indices_.mutable_data<int>();
ComputeIndicesKernel<<<
std::min(maskSize, CAFFE_MAXIMUM_NUM_BLOCKS),
CAFFE_CUDA_NUM_THREADS,
0,
context_.cuda_stream()>>>(
numMasks, maskSize, indicesData, masks_.data<bool*>());
C10_CUDA_KERNEL_LAUNCH_CHECK();
auto* valueSizesData = valueSizes_.mutable_data<int>();
FillValuesKernel<<<
std::min(numMasks, CAFFE_MAXIMUM_NUM_BLOCKS),
CAFFE_CUDA_NUM_THREADS,
0,
context_.cuda_stream()>>>(
numMasks,
maskSize,
meta.itemsize(),
indicesData,
values_.data<char*>(),
valueSizesData,
dest);
C10_CUDA_KERNEL_LAUNCH_CHECK();
return true;
}
private:
Tensor indices_;
Tensor masks_{CUDA};
Tensor values_{CUDA};
Tensor valueSizes_{CUDA};
Tensor hostMasks_;
Tensor hostValues_;
Tensor hostValueSizes_;
};
REGISTER_CUDA_OPERATOR(BooleanUnmask, BooleanUnmaskOp<CUDAContext>);
} // caffe2
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