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#ifndef CAFFE2_OPERATORS_LENGTH_SPLIT_OP_H_
#define CAFFE2_OPERATORS_LENGTH_SPLIT_OP_H_
#include "caffe2/core/common_omp.h"
#include "caffe2/core/context.h"
#include "caffe2/core/logging.h"
#include "caffe2/core/operator.h"
#include "caffe2/utils/math.h"
#include "c10/util/irange.h"
namespace caffe2 {
template <class Context>
class LengthsSplitOp final : public Operator<Context> {
public:
USE_OPERATOR_CONTEXT_FUNCTIONS;
template <class... Args>
explicit LengthsSplitOp(Args&&... args)
: Operator<Context>(std::forward<Args>(args)...),
n_split_(OperatorBase::GetSingleArgument<int32_t>("n_split", 0)) {
if (InputSize() == 1) {
// If not specified, then must have this argument
CAFFE_ENFORCE(
OperatorBase::HasArgument("n_split"),
"Argument `n_split` is missing and was not specified as input.");
CAFFE_ENFORCE(
n_split_ > 0,
"`n_split` must contain a positive value for defined behavior.");
}
}
~LengthsSplitOp() {}
bool RunOnDevice() override {
const auto& L = Input(0);
CAFFE_ENFORCE_EQ(L.dim(), 1, "Input `LENGTHS` should be a 1D vector.");
if (InputSize() > 1) {
// We potentially have n_split specified as inputs as well
CAFFE_ENFORCE(
Input(1).dim() == 1 && Input(1).numel() == 1,
"Input `n_split` should be a vector of size 1.");
const auto& input1 = Input(1);
context_.template CopyItems<Context, CPUContext>(
input1.dtype(), 1, input1.raw_data(), &n_split_);
}
CAFFE_ENFORCE(
n_split_ > 0,
"`n_split` must contain a positive value for defined behavior.");
const auto M = L.numel();
auto* Y = Output(0, {M * n_split_}, at::dtype<int32_t>());
const int32_t* Ldata = L.template data<int32_t>();
int32_t* Ydata = Y->template mutable_data<int32_t>();
for (const auto i : c10::irange(M)) {
int32_t mod = Ldata[i] % n_split_;
int32_t res =
mod != 0 ? math::DivUp(Ldata[i], n_split_) : Ldata[i] / n_split_ + 1;
for (const auto j : c10::irange(n_split_)) {
Ydata[(i * n_split_) + j] = mod-- > 0 ? res : res - 1;
}
}
return true;
}
private:
int32_t n_split_;
};
} // namespace caffe2
#endif // CAFFE2_OPERATORS_LENGTH_SPLIT_OP_H_
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