#ifndef CAFFE2_OPERATORS_ENSURE_CPU_OUTPUT_OP_H_
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#define CAFFE2_OPERATORS_ENSURE_CPU_OUTPUT_OP_H_
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#include "caffe2/core/context.h"
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#include "caffe2/core/operator.h"
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#include "caffe2/utils/math.h"
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namespace caffe2 {
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template <class Context>
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class EnsureCPUOutputOp : public Operator<Context> {
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public:
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USE_OPERATOR_CONTEXT_FUNCTIONS;
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template <class... Args>
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explicit EnsureCPUOutputOp(Args&&... args)
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: Operator<Context>(std::forward<Args>(args)...) {}
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bool RunOnDevice() override {
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if (this->InputIsTensorType(0, CPU)) {
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return CopyWithContext<CPUContext>();
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} else if (this->InputIsTensorType(0, Context::GetDeviceType())) {
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// CUDA Context will go this branch
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return CopyWithContext<Context>();
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} else {
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CAFFE_THROW(
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"Unexpected Input Blob: ",
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OperatorBase::Inputs().at(0)->meta().name());
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}
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return true;
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}
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private:
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template <class InputContext>
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bool CopyWithContext() {
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// Output is always on CPU
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auto* output = this->template Output<Tensor>(0, CPU);
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auto& input = this->template Input<Tensor>(0, InputContext::GetDeviceType());
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output->ResizeLike(input);
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context_.CopyItemsToCPU(
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input.dtype(),
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input.numel(),
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input.raw_data(),
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output->raw_mutable_data(input.dtype()));
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context_.FinishDeviceComputation();
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return true;
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}
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};
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} // namespace caffe2
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#endif // CAFFE2_OPERATORS_ENSURE_CPU_OUTPUT_OP_H_
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