Keyword Extraction Goal given n documents each consisting of words, extract the most significant subset of words> keywords Example [All the students are taking exams]-->[student, take, exam Keyword Extraction Process remove stop words stem remaining terms collapse terms using thesaurus build inverted index extract key words-build key word index extract key phrases- build key phrase index2 Keyword Extraction ◼ Goal: ◼ given N documents, each consisting of words, ◼ extract the most significant subset of words → keywords ◼ Example ◼ [All the students are taking exams] -- >[student, take, exam] ◼ Keyword Extraction Process ◼ remove stop words ◼ stem remaining terms ◼ collapse terms using thesaurus ◼ build inverted index ◼ extract key words - build key word index ◼ extract key phrases - build key phrase index i t