Learning Context-free Languages with Nondeterministic Stack RNNs Brian DuSell author David Chiang author 2020-11 text Proceedings of the 24th Conference on Computational Natural Language Learning Raquel Fernández editor Tal Linzen editor Association for Computational Linguistics Online conference publication dusell-chiang-2020-learning 10.18653/v1/2020.conll-1.41 https://aclanthology.org/2020.conll-1.41/ 2020-11 507 519