There is no B- tag for the CoNLL2003 data set.

[weiczhu]

Hi,
I have inspected the data set here.
https://github.com/synalp/NER/blob/master/corpus/CoNLL-2003/eng.testa
I found for the entity tags there is no "B-", is there something wrong?
Thanks

[weiczhu]

LONDON NNP I-NP I-LOC -> For the SINGLE tag, it should be "B-LOC", right?
1996-08-30 CD I-NP O

[yhcc]

This link might be helpful. https://datascience.stackexchange.com/questions/37824/difference-between-iob-and-iob2-format