def get_sentence_keyword_score(document, num_sentences):
rake = Rake()
keywords = rake.get_keywords(document)
ranked_keywords = rake.generate_keyword_rank(keywords)
sufficient_keywords_length = int(math.ceil(len(ranked_keywords) / 4.0))
sufficient_keywords = ranked_keywords[:sufficient_keywords_length]
total_keyword_score = 0.0
# value of a keyword is its relative score value divided by the score of all keywords
sentence_keyword_score = [0.0] * num_sentences
for keyword in sufficient_keywords:
total_keyword_score += keyword['score']
for keyword in sufficient_keywords:
sentence_keyword_score[
keyword['sentence_num']] += keyword['score'] / total_keyword_score
return sentence_keyword_score
