Apposition breaks Constituency parser in Corenlp 4.x while not in Corenlp 3.9.x

[diegollarrull]

Issue:

Adding an apposition to a sentence breaks the constituency parse in CoreNLP 4.x (tested with 4.2.2 and 4.4.0) while it doesnt happen in CoreNLP 3.9.1

Steps to reproduce:

Parse with constituency parse the following two questions:

• is there a way to fix this?
• however, with this apposition, is there a way to fix this?

Expected output:

"there" should have the EX tag in both questions

Actual output:

CoreNLP 4.x: "there" has the EX tag in the first sentence and the RB tag in the sentence with the apposition CoreNLP 3.9: "there" has the EX tag in both questions

Please see attached images for visual confirmation

CoreNLP4 - No apposition:

CoreNLP4 - with apposition:

CoreNLP3 - No apposition:

CoreNLP3 - with apposition:

Thank you very much in advance

[AngledLuffa]

If you use the POS tagger first, it seems to be a little more robust finding the EX tag with those rearrangements. Maybe give that a try?

Also, recommend using the SRParser (presumably the demo uses the older PCFG, or it wouldn't work without POS)