Samuel R. Bowman Christopher D. Manning Christopher Potts Tree-Structured Composition in Neural Networks without Tree-Structured Architectures. 2015 CoCo@NIPS https://ceur-ws.org/Vol-1583/CoCoNIPS_2015_paper_5.pdf conf/nips/2015coco db/conf/nips/coco2015.html#BowmanMP15