how to make only one bidirectional layer, and other regular rnn layers

[johnsonice]

Thank you very much your tutorial. it really helped me a lot. I am wondering if you can help me with this. In you set up, it seems that you are making every encoding layer as bidirectional. But i think it is also very common that we only make 1 bidirectional layer and making other layers as regular rnn layers.(like google's translation model).

I am not sure how to connect a bidirectional layer with a regular rnn layer?