大天的博客

python中np.nonzero函数的用法 先举一个一维的例子： def vec2text(vec): text=[] char_pos=vec.nonzero() return char_pos char_pos=np.array([1,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1]) char_pos =vec2text(char_pos...

import re, collections #找到所有的单词 def words(text): return re.findall('[a-z]+', text.lower()) def train(features): model = collections.defaultdict(lambda: 1) for f in features: model[f...