Which version of CTB to use?

[yangky11]

Hi,

The CTB version in the paper is 5.1 but this repo links to CTB 8.0. I'm wondering which version should be used to reproduce the experiments? Thank you.

[hantek]

The 8.0 and 5.1 are different versions, but we were not able to find the original 5.1 version from the web. According to [Liu and Zhang. 2017b], who is using 5.1, we found that we were able to find all the train/valid/test sections in our 8.0 version data. So we extracted the corresponding sections in 8.0 to form a 5.1 version out from it, and then discarded the remaining sections that were not used.

You can find which sections were selected and how they were split into train/valid/test splits in ctb.py

Ref: Jiangming Liu and Yue Zhang. 2017b. Shift-reduce constituent parsing with neural lookahead features. Transactions of the Association for Computational Linguistics 5:45–58.

[yangky11]

Thanks for your reply. So 5.1 is a subset of 8.0, which can be extracted by ctb.py?

[hantek]

Yes. Each newer version is a superset of older versions, sometimes with minor corrections to errors in previous versions. See https://catalog.ldc.upenn.edu/LDC2013T21

On Thu, Mar 26, 2020 at 5:03 PM Kaiyu Yang [email protected] wrote:

Thanks for your reply. So 5.1 is a subset of 8.0, which can be extracted by ctb.py?

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[yangky11]

Thank you for the clarification!

[yangky11]

Hi Zhouhan,

I followed the instructions to extract CTB data. I got 17,544 training examples, 352 validation examples and 348 testing examples. Is that correct? It feels to me the number of validation/testing examples are too few; so I'm wondering if something in my preprocessing has gone wrong.

Thanks!