before_sent:  In this work, we explore to reuse the representations from different encoder layers for layer-wise cross-view decoding , that is, different views of the source sequences are presented to different decoder layers .
before_sent_with_intent: <clarity>  In this work, we explore to reuse the representations from different encoder layers for layer-wise cross-view decoding , that is, different views of the source sequences are presented to different decoder layers .
after_sent:  In this work, we propose to encourage the decoder to take the full advantage of the multi-level source representations for layer-wise cross-view decoding , that is, different views of the source sequences are presented to different decoder layers .