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arXiv · 2509.09388

Hierarchical Bracketing Encodings Work for Dependency Graphs

Ana Ezquerro·Carlos Gómez-Rodríguez·David Vilares
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Abstract

We revisit hierarchical bracketing encodings from a practical perspective in the context of dependency graph parsing. The approach encodes graphs as sequences, enabling linear-time parsing with $n$ tagging actions, and still representing reentrancies, cycles, and empty nodes. Compared to existing graph linearizations, this representation substantially reduces the label space while preserving structural information. We evaluate it on a multilingual and multi-formalism benchmark, showing competitive results and consistent improvements over other methods in exact match accuracy.

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Ana Ezquerro, Carlos Gómez-Rodríguez, David Vilares. 2025-09-11. Hierarchical Bracketing Encodings Work for Dependency Graphs. https://arxiv.org/abs/2509.09388

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