(2011), they had been considered of theoretical interest only due to their incompatibility with rich feature models: incorporation of complex features resulted in jumps in asymptotic runtime complexity to impractical levels.
the recent popularization of bidirectional long-short term memory networks (bi-LSTMs; Hochreiter and Schmidhuber, 1997) to derive feature representations for parsing, given their capacity to capture long-range information, has demonstrated that one may not need to use complex feature models to obtain good accuracy (Kiperwasser and Goldberg, 2016;Cross and Huang, 2016).