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#ifndef TIM_VX_OPS_GRUCELL_H_
#define TIM_VX_OPS_GRUCELL_H_

#include <array>
#include "tim/vx/builtin_op.h"

namespace tim {
namespace vx {
namespace ops {

/**
 * ## GRUCell
 *
 * - num_units : dimensionality of the output space.
 * - activation : Activation function to use.
 * - recurrent_activation : Activation function to use for the recurrent step.
 * - reset_after : whether to apply reset gate after or before matrix multiplication.
 *   False = "before", True = "after".
 */

class GRUCell : public BuiltinOp {
 public:
  enum ActivationType {
    kNONE = 0,
    kRELU = 1,
    kRELU6 = 3,
    kTANH = 4,
    kSIGMOID = 6,
    kHARDSIGMOID = 31, /* temporary use 31 */
  };

  GRUCell(Graph* graph, uint32_t num_units,
          ActivationType activation = ActivationType::kTANH,
          ActivationType recurrent_activation = ActivationType::kSIGMOID,
          bool reset_after = true);

  std::shared_ptr<Operation> Clone(
      std::shared_ptr<Graph>& graph) const override;

 protected:
  const uint32_t num_units_;
  const ActivationType activation_;
  const ActivationType recurrent_activation_;
  const bool reset_after_;
};

}  // namespace ops
}  // namespace vx
}  // namespace tim

#endif /* TIM_VX_OPS_GRUCELL_H_ */