Reverse Engineering of Tree Kernel Feature Spaces Daniele Pighin author Alessandro Moschitti author 2009-08 text Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing Philipp Koehn editor Rada Mihalcea editor Association for Computational Linguistics Singapore conference publication pighin-moschitti-2009-reverse https://aclanthology.org/D09-1012/ 2009-08 111 120