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Null nodes for ellipsis #61

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francescomambrini opened this issue Aug 18, 2020 · 2 comments
Closed

Null nodes for ellipsis #61

francescomambrini opened this issue Aug 18, 2020 · 2 comments

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@francescomambrini
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@francescomambrini francescomambrini commented Aug 18, 2020 •
edited

Together with Multi-Word Expressions, the UD V.2 guidelines introduce also a special representation for Null Nodes in ellipsis, as in:

# text: Sue likes coffee and Bill tea
1      Sue       Sue
2      likes     like
3      coffee    coffee
4      and       and
5      Bill      Bill
5.1    likes     like
6      tea       tea

It would be great if udapi could support them as well, but I see that most treebank do not used those null nodes yet. Is there any plan to work on this extension in the near future?
(I am asking, because I might tentatively work on something myself, if you are not planning to do it).

Thank you for this very useful library!
@martinpopel
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@martinpopel martinpopel commented Aug 18, 2020

Hi Francesco. What kind of support are you missing?

Udapi has a partial support for empty nodes: There is root.empty_nodes, which returns a list of all empty nodes in a given tree. You can create new empty nodes with node.create_empty_child().
You can access (read and write) enhanced dependencies with node.deps, which returns a list Python dicts ({'parent':node1, 'deprel':'nsubj'}, {'parent':node2, 'deprel':'nsubj'}). (There is also node.raw_deps for the serialized form of the enhanced deps, but you should not need this.)

There are still some TODOs, e.g. a method for easy access to enhanced children of a given node. There is also #59, which I forgot to review.
@francescomambrini
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@francescomambrini francescomambrini commented Aug 19, 2020

Hi Martin, I am sorry!!! I completely missed the node.create_empty_child() method: it works well to support the creation of Null nodes. Thank you for pointing this out.
@francescomambrini francescomambrini mentioned this issue Oct 30, 2020
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@martinpopel @francescomambrini
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