added multi-layer SeqToSeq projection
added multi-layer SeqToSeq projection

jamesjia94/BIDMach,BIDData/BIDMach,jamesjia94/BIDMach,BIDData/BIDMach,jamesjia94/BIDMach,BIDData/BIDMach,jamesjia94/BIDMach,jamesjia94/BIDMach,BIDData/BIDMach,BIDData/BIDMach,jamesjia94/BIDMach,BIDData/BIDMach