Second, C&S identify potential NEs based on proper nouns, but unlike English, (1) proper noun identification for Bengali is non-trivial, due to the lack of capitalization; and (2) there does not exist an accurate Bengali part-of-speech (POS) tagger for providing such information, owing to the scarcity of annotated data for training the tagger.
bengali NER is complicated not only by the scarcity of annotated data, but also by the lack of an accurate POS tagger.