Depth-bounding is effective: Improvements and evaluation of unsupervised PCFG induction Lifeng Jin author Finale Doshi-Velez author Timothy Miller author William Schuler author Lane Schwartz author 2018-oct-nov text Proceedings of the 2018 Conference on Empirical Methods in Natural Language Processing Ellen Riloff editor David Chiang editor Julia Hockenmaier editor Jun’ichi Tsujii editor Association for Computational Linguistics Brussels, Belgium conference publication jin-etal-2018-depth 10.18653/v1/D18-1292 https://aclanthology.org/D18-1292/ 2018-oct-nov 2721 2731