#ifndef PADDLE_ADAGRAD_OPTIMIZER_H_
#define PADDLE_ADAGRAD_OPTIMIZER_H_

#include "parameter_optimizer.h"

namespace paddle {
namespace optimizer {

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

private:
  Tensor<T> *accum_gradient;
  double epsilon;
  double decay;
};

}  // namespace optimizer
}  // namespace paddle

#endif