#ifndef PADDLE_ADADELTA_OPTIMIZER_H_
#define PADDLE_ADADELTA_OPTIMIZER_H_

#include "parameter_optimizer.h"

namespace paddle {
namespace optimizer {

template <class T>
class AdadeltaOptimizer : public ParameterOptimizer<T> {
public:
  AdadeltaOptimizer(const OptimizerConfig &config);
  ~AdadeltaOptimizer() {
    if (accum_gradient) delete accum_gradient;
    if (accum_delta) delete accum_delta;
    if (update_delta) delete update_delta;
  }
  void update(const Tensor<T> &gradient);
  void set_weight(const Tensor<T> *p);
  T *get_weight() const;

private:
  Tensor<T> *accum_gradient;
  Tensor<T> *accum_delta;
  Tensor<T> *update_delta;

  double rho;
  double epsilon;
  double decay;
};

}  // namespace optimizer
}  // namespace paddle

#endif