“…Most of the algorithms in the earlier literature were tested with the sets of the annotated data and labels, such as CoNLL‐2000, CoNLL‐2002, CoNLL‐2003 and Automatic Content Extraction (ACE; Finkel and Manning, ; Ratinov and Roth, ). A recent trend of studying NER is to replace annotated labels by sentiment expressions (Breck et al ., ), medical information (Aramaki et al ., ), gene–protein mentions (Airola et al ., , Yu et al ., ), Wikipedia (Wu and Weld, ) or even the whole Web (Whitelaw et al ., ). As far as the NER methods are considered, other than the rule‐based methods, the classification and sequential learning techniques have been paid special attentions in performing NER activities.…”