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Should GoldParse.init accept doc=None?

See original GitHub issue

Not sure if this is bug exactly (the GoldParse API documentation isn’t specific on whether the doc argument is optional or not, but given that there is a words argument, it would be nice to not have to pass in doc when this argument has been specified

How to reproduce the behaviour

from spacy.gold import GoldParse

annotation = GoldParse(words=["some", "words"], cats={"mylabel": 1.0})

produces the following error.

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-28-f161c45966e4> in <module>
----> 1 annotation = GoldParse(words=["some", "words"], cats={"mylabel": 1.0})

gold.pyx in spacy.gold.GoldParse.__init__()

TypeError: __init__() takes at least 1 positional argument (0 given)

My current workaround is something like the following, but would be nice to avoid this unless it is still necessary for a reason that I am missing.

from spacy.gold import GoldParse
import spacy

tokenizer = spacy.load('en_core_web_sm').tokenizer
annotation = GoldParse(tokenizer(" ".join(["some", "words"])), cats={"mylabel": 1.0})