#ifndef CAFFE2_OPERATORS_WHILE_OP_H_
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#define CAFFE2_OPERATORS_WHILE_OP_H_
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#include "caffe2/core/context.h"
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#include "caffe2/core/logging.h"
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#include "caffe2/core/operator.h"
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namespace caffe2 {
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template <class Context>
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class WhileOp final : public Operator<Context> {
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public:
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explicit WhileOp(const OperatorDef& operator_def, Workspace* ws)
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: Operator<Context>(operator_def, ws) {
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CAFFE_ENFORCE(
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this->template HasSingleArgumentOfType<NetDef>("loop_net"),
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"loop_net must be specified in While operator");
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loop_net_def_ =
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this->template GetSingleArgument<NetDef>("loop_net", NetDef());
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loop_net_ = CreateNet(loop_net_def_, ws);
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CAFFE_ENFORCE(loop_net_, "Failed to initialize loop subnet");
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cond_net_ = nullptr;
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bool has_cond_net =
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this->template HasSingleArgumentOfType<NetDef>("cond_net");
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if (has_cond_net) {
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cond_net_def_ =
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this->template GetSingleArgument<NetDef>("cond_net", NetDef());
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cond_net_ = CreateNet(cond_net_def_, ws);
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CAFFE_ENFORCE(cond_net_, "Failed to initialize condition subnet");
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}
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}
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USE_OPERATOR_CONTEXT_FUNCTIONS;
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bool RunOnDevice() override {
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CAFFE_ENFORCE(
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this->InputIsTensorType(0, Context::GetDeviceType()),
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"Invalid condition in While operator: tensor expected");
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const auto& condition = Input(0);
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CAFFE_ENFORCE_EQ(
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condition.numel(),
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1,
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"Invalid condition tensor in While operator: single value expected");
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while (true) {
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if (cond_net_ && !cond_net_->Run()) {
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return false;
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}
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if (!*condition.template data<bool>()) {
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return true;
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}
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if (!loop_net_->Run()) {
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return false;
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}
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}
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return true;
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}
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private:
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NetDef loop_net_def_;
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std::unique_ptr<NetBase> loop_net_;
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NetDef cond_net_def_;
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std::unique_ptr<NetBase> cond_net_;
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};
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} // namespace caffe2
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#endif // CAFFE2_OPERATORS_WHILE_OP_H_
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