noun chunks are missed when there are ()

[pengyu]

The following example shows that phospholipase C (PLC) δ1 can not be correctly extracted. This usually happens when there are (). Can this bug be systematically fixed?

$ cat main2.py 
#!/usr/bin/env python
# vim: set noexpandtab tabstop=2 shiftwidth=2 softtabstop=-1 fileencoding=utf-8:

import spacy
nlp = spacy.load('en', disable=['tokenizer', 'ner', 'textcat'])
## 'tagger' and 'parser' can not be disabled.

doc = nlp(u'We previously revealed that the expression of phospholipase C (PLC) δ1, one of the most basal PLCs, is down-regulated in colon adenocarcinoma, and that the KRAS signaling pathway suppresses PLCδ1 expression.')
print [x for x in doc.noun_chunks]
$ ./main2.py 
[We, the expression, phospholipase C (PLC, δ1, the most basal PLCs, colon adenocarcinoma, the KRAS, PLCδ1 expression]

[ines]

The noun chunks depend on the part-of-speech tags and dependency parse, so this issue likely comes down to incorrect predictions made by the tagger or parser.

I'm merging this with #3052. We've now added a master thread for incorrect predictions and related reports – see the issue for more details.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.