/****************************************************************************
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*    Copyright (c) 2020 Vivante Corporation
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#ifndef TIM_VX_OPS_UNIDIRECTIONAL_SEQUENCE_LSTM_H_
#define TIM_VX_OPS_UNIDIRECTIONAL_SEQUENCE_LSTM_H_
#include "tim/vx/operation.h"

namespace tim {
namespace vx {
namespace ops {
    /**
     * ## Unidirectional sequence lstm
     *  how to bind input/output: take unidirectional_sequence_lstm_test.cc
     */
    class UnidirectionalSequenceLstm: public Operation {
     public:
      enum ActivationType {
        kNONE = 0,
        kRELU = 1,
        kRELU6 = 2,
        kTANH = 3,
        kSIGMOID = 4,
        kHARDSIGMOID = 5,
        kCOUNT
      };

      UnidirectionalSequenceLstm(
          Graph* graph, float cell_clip, float proj_clip,
          ActivationType act_type, float forget_bias, bool time_major = false,
          ActivationType recurrent_act_type = ActivationType::kNONE,
          bool return_sequences = false /*False: only return last state*/
      );

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

     protected:
      ActivationType act_type_;
      ActivationType recurrent_act_type_;
    };
}
}  // namespace vx
}  // namespace tim

#endif