Keyword Extraction for Medium-Sized Documents Using Corpus-Based Contextual Semantic Smoothing

Table 1

Different combinations of POS in the literature.

S#
	[26–30]	Nouns only
	[9, 31]	Nouns and verbs only
	[6, 20–23, 32, 33]	Nouns and adjectives only
	[15, 34–37]	Nouns, verbs, and adjectives only
	[16]	Nouns, verbs, adjectives, and adverbs only
	[38]	Verbs and adverbs only