It is inspired by the system described in Ratinov and Roth ( 2009 ) .
design challenges and misconceptions in named entity recognition
Lev Ratinov Dan Roth
In this section we describe in detail the baseline NER system we use . It is inspired by the system described in Ratinov and Roth ( 2009 ) . Because NER annotations are commonly not nested ( for example , in the text `` the US Army '' , `` US Army '' is treated as a single entity , instead of the location `` US '' and the organization `` US Army '' ) it is possible to treat NER as a sequence labeling problem , where each token in the sentence receives a label which depends on which entity type it belongs to and its position in the entity .
It is inspired by the system described in @@CITATION .