Accurate Unlexicalized Parsing
Klein & Manning, 2003, Accurate Unlexicalized Parsing (Proceedings of the 41st Annual Meeting of ACL)
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3 External vs. Internal Annotation
- What is the difference between external and internal annotation, in Klein and Manning’s terms?External annotation (marked ^X) records a feature of a node’s environment that influences its expansion, like parent annotation. Internal annotation (marked -X) records a feature of the node’s hidden contents that influences its distribution, like head lexicalization (a radical case).
- Klein & Manning, 2003, Accurate Unlexicalized Parsing (Proceedings of the 41st Annual Meeting of ACL), §3, pp. 426–427
- What do UNARY-INTERNAL, UNARY-DT and UNARY-RB do?UNARY-INTERNAL marks nodes with a single child, so unary rewrites are confined to contexts where they occur (+0.55 F1 alone). Marking only-child tags captures distributional distinctions the Penn tags conflate: demonstratives (that, those) vs determiners (the, a), and e.g. as well vs also.
- Klein & Manning, 2003, Accurate Unlexicalized Parsing (Proceedings of the 41st Annual Meeting of ACL), §3, pp. 426–427
Source
- Dan Klein and Christopher D. Manning. 2003. Accurate Unlexicalized Parsing. In Proceedings of the 41st Annual Meeting of the Association for Computational Linguistics, pp. 423–430. https://aclanthology.org/P03-1054/