place-name recognition

[alabrashJr]

Placename recognition is an essential technique that pipeline should master.
Social scientists see placename as a piece of important information in commenting about the events.
the model we are using is not doing very well so I tried using NLTK, Standford and Spacy NER.
the results as follows,

	% of 1-gram matching	match token number
gold_tokens	1.000.000	177
used_classifier (BERT)	0.610169	108
nltk	0.723164	128
spacy	0.000000	0
standford	0.423729	75
NeuroNER	0.203390	36

[OsmanMutlu]

We are now using SoTA Flair's place name model (en-ner-conll03-v0.4) as an extra place name extractor.
This model has a recall of 97% in our test data.