def review_to_words(raw_review): #这个函数的功能就是将原始的数据经过预处理变成一系列的词。 #输入是原始的数据(一条电影评论)。 #输出是一系列的词(经过预处理的评论) review_text = BeautifulSoup(raw_review,'lxml').get_text() letters_only = re.sub('[^a-zA-
1. an idea or topic expanded in a discourse, discussion, etc 2. (in literature, music, art, etc) a unifying idea, image, or motif, repeated or developed throughout a work 3. (Music, other) music a group of notes forming a recognizable melodic unit, often used as the basis of the...
neutral, or sad. The magic behind this is a Python library known as NLTK – the Natural Language Toolkit. The smart people that wrote this package took what is known about Natural Language Processing in the literature and have packaged it for dummies ...