#pragma once

#include "parameter_optimizer.h"

namespace paddle {
namespace optimizer {

class AdadeltaOptimizer : public ParameterOptimizer {
public:
  AdadeltaOptimizer(double rho, double epsilon, double decay, LrPolicy *lr)
      : ParameterOptimizer(lr),
        accum_gradient_(nullptr),
        accum_delta_(nullptr),
        update_delta_(nullptr),
        rho_(rho),
        epsilon_(epsilon),
        decay_(decay) {}
  ~AdadeltaOptimizer() {
    if (accum_gradient_) delete accum_gradient_;
    if (accum_delta_) delete accum_delta_;
    if (update_delta_) delete update_delta_;
  }
  void Update(const Tensor *gradient);
  void set_weight(Tensor *p);

private:
  Tensor *accum_gradient_;
  Tensor *accum_delta_;
  Tensor *update_delta_;
  double rho_;
  double epsilon_;
  double decay_;
};

}  // namespace optimizer
}  // namespace paddle