code: def hybrid_forward(self, F, inputs, mem_value, mask=None, mem_mask=None):  #pylint: disable=unused-argument
          #  pylint: disable=arguments-differ
          
          outputs, attention_in_outputs =\
              self.attention_cell_in(inputs, inputs, inputs, mask)
          outputs = self.proj_in(outputs)
          if self._dropout:
              outputs = self.dropout_layer(outputs)
          if self._use_residual:
              outputs = outputs + inputs
          outputs = self.layer_norm_in(outputs)
          inputs = outputs
          outputs, attention_inter_outputs = \
              self.attention_cell_inter(inputs, mem_value, mem_value, mem_mask)
          outputs = self.proj_inter(outputs)
          if self._dropout:
              outputs = self.dropout_layer(outputs)
          if self._use_residual:
              outputs = outputs + inputs
          outputs = self.layer_norm_inter(outputs)
          outputs = self.ffn(outputs)
          additional_outputs = []
          if self._output_attention:
              additional_outputs.append(attention_in_outputs)
              additional_outputs.append(attention_inter_outputs)
          return outputs, additional_outputs
docs: Transformer Decoder Attention Cell.
  
          Parameters
          ----------
          inputs : Symbol or NDArray
              Input sequence. Shape (batch_size, length, C_in)
          mem_value : Symbol or NDArrays
              Memory value, i.e. output of the encoder. Shape (batch_size, mem_length, C_in)
          mask : Symbol or NDArray or None
              Mask for inputs. Shape (batch_size, length, length)
          mem_mask : Symbol or NDArray or None
              Mask for mem_value. Shape (batch_size, length, mem_length)
  
          Returns
          -------
          decoder_cell_outputs: list
              Outputs of the decoder cell. Contains:
  
              - outputs of the transformer decoder cell. Shape (batch_size, length, C_out)
              - additional_outputs of all the transformer decoder cell