DependencyTrees.jl is a Julia package for working with dependency structures in natural language sentences. It provides a representation of dependency parse trees (DependencyTree), a treebank reader, and transition-based parsing algorithms.

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The DependencyTree type represents a dependency parse of a natural language sentence.

julia> using DependencyTrees

julia> treebank = Treebank("test/data/english.conllu")

julia> for tree in treebank
           # ...
       end

julia> tree = first(treebank)
┌──────────────────── ROOT
│                 ┌─► Pierre
│     ┌─►┌──┌──┌──└── Vinken
│     │  │  │  └────► ,
│     │  │  │     ┌─► 61
│     │  │  │  ┌─►└── years
│     │  │  └─►└───── old
│     │  └──────────► ,
└─►┌──└───────────┌── will
   │  ┌─────┌──┌──└─► join
   │  │     │  │  ┌─► the
   │  │     │  └─►└── board
   │  │  ┌──└───────► as
   │  │  │     ┌────► a
   │  │  │     │  ┌─► nonexecutive
   │  │  └────►└──└── director
   │  └──────────►┌── Nov.
   │              └─► 29
   └────────────────► .

A number of transition systems and oracles are implemented in the TransitionParsing submodule.

julia> using DependencyTrees
julia> using DependencyTrees.TransitionParsing
julia> treebank = Treebank("test/data/english.conll")
julia> oracle = Oracle(ArcHybrid(), dymanic_oracle)
julia> for tree in treebank, (config, gold ts) in oracle(tree)
           # ...
       end

Transition systems:

• ArcStandard (static oracle)
• ArcEager^[1],[2] (static and dynamic oracles)
• ArcHybrid^[3],[4] (static and dynamic oracles)
• ArcSwift^[5] (static oracle)
• ListBasedNonProjective^[2] (static oracle)

See the documentation for details.

]add DependencyTrees

Open an issue! Bug reports, feature requests, etc. are all welcome.

[1]: Nivre 2003: An efficient algorithm for projective dependency parsing. http://stp.lingfil.uu.se/~nivre/docs/iwpt03.pdf

[2]: Nivre 2008: Algorithms for Deterministic Incremental Dependency Parsing. https://www.aclweb.org/anthology/J/J08/J08-4003.pdf

[3]: Kuhlmann et all 2011: Dynamic programming algorithms for transition-based dependency parsers. https://www.aclweb.org/anthology/P/P11/P11-1068.pdf

[4]: Goldberg & Nivre 2013: Training deterministic parsers with non-deterministic oracles. https://aclweb.org/anthology/Q/Q13/Q13-1033.pdf

[5]: Qi & Manning 2016: Arc-swift: a novel transition system for dependency parsing. https://nlp.stanford.edu/pubs/qi2017arcswift.pdf