def doc_importance(self):
for i in self.doc_split:
sig_word = []
tokens = Kkma().morphs(i)
for j in tokens:
if j in self.word:
sig_word.append(tokens.index(j))
length = max(sig_word) - min(sig_word) + 1
self.importance.append(len(sig_word) * len(sig_word) / length)
