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Like the\nconventional stack data structures used in transition-based parsing, elements\ncan be pushed to or popped from the top of the stack in constant time, but, in\naddition, an LSTM maintains a continuous space embedding of the stack contents.\nThis lets us formulate an efficient parsing model that captures three facets of\na parser's state: (i) unbounded look-ahead into the buffer of incoming words,\n(ii) the complete history of actions taken by the parser, and (iii) the\ncomplete contents of the stack of partially built tree fragments, including\ntheir internal structures. 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