reid from https://github.com/michuanhaohao/reid-strong-baseline
zhangmeng
2020-01-17 f7c4a3cfd07adede3308f8d9d3d7315427d90a7c
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#pragma once
 
#include "caffe2/core/net.h"
#include "caffe2/core/observer.h"
#include "caffe2/core/operator.h"
 
namespace caffe2 {
 
// Thin class that attaches the observer to all operators in the net
template <typename TOpObserver, typename TNetObserver>
class OperatorAttachingNetObserver : public ObserverBase<NetBase> {
 public:
  explicit OperatorAttachingNetObserver(
      NetBase* subject_,
      TNetObserver* netObserver)
      : ObserverBase<NetBase>(subject_) {
    const auto& operators = subject_->GetOperators();
    for (auto* op : operators) {
      auto observer = caffe2::make_unique<TOpObserver>(op, netObserver);
      const auto* ob = observer.get();
      op->AttachObserver(std::move(observer));
      operator_observers_.push_back(ob);
    }
  }
  virtual ~OperatorAttachingNetObserver(){};
 
 protected:
  std::vector<const TOpObserver*> operator_observers_;
};
 
} // namespace caffe2