class JudgeMail:
'''
calculate the possibility of being a spam
'''
def __init__(self, mail_file):
self.mail_file = mail_file
self.train_module = TrainModule()
self.P_SPAM = 0.5
self.P_NORMAL = 1 - self.P_SPAM
self.P_SPAM_WORD = 0.4
self.P_IS_SPAM_LIMIT = 0.9
self.train_module.set_dic_word_freq()
def judge(self):
mail_content = EmailParser(self.mail_file).get_mail_content()
res_list = SplitWords(mail_content).get_word_list()
word_list = list(set(res_list))
for i in \
[';', ':', ',', '.', '?', '!', '(', ')', ' ', '/',\
'；', '：', '，', '。', '？', '！', '（', '）', ' ', '、']:
if i in word_list:
word_list.remove(i)
word_freq = []
for word in word_list:
if word in self.train_module.dic_word_freq:
p_w_n = self.train_module.dic_word_freq[word][0]
p_w_s = self.train_module.dic_word_freq[word][1]
p_s_w = p_w_s * self.P_SPAM / (p_w_s * self.P_SPAM +
p_w_n * self.P_NORMAL)
word_freq.append((word, p_s_w))
else:
word_freq.append((word, self.P_SPAM_WORD))
word_freq_most = sorted(word_freq, key=lambda x: x[1],
reverse=True)[:15]
p = 1.0
rest_p = 1.0
for i in word_freq_most:
print i[0], i[1]
p *= i[1]
rest_p *= (1 - i[1])
p_spam = p / (p + rest_p)
mail_type = ''
if p_spam > self.P_IS_SPAM_LIMIT:
mail_type = 'spam'
else:
mail_type = 'normal'
self.train_module.update(mail_type, word_list)
return p_spam
class JudgeMail:
'''
calculate the possibility of being a spam
'''
def __init__(self, mail_file):
self.mail_file = mail_file
self.train_module = TrainModule()
self.P_SPAM = 0.5
self.P_NORMAL = 1 - self.P_SPAM
self.P_SPAM_WORD = 0.4
self.P_IS_SPAM_LIMIT = 0.9
self.train_module.set_dic_word_freq()
def judge(self):
mail_content = EmailParser(self.mail_file).get_mail_content()
res_list = SplitWords(mail_content).get_word_list()
word_list = list(set(res_list))
for i in \
[';', ':', ',', '.', '?', '!', '(', ')', ' ', '/',\
'；', '：', '，', '。', '？', '！', '（', '）', ' ', '、']:
if i in word_list:
word_list.remove(i)
word_freq = []
for word in word_list:
if word in self.train_module.dic_word_freq:
p_w_n = self.train_module.dic_word_freq[word][0]
p_w_s = self.train_module.dic_word_freq[word][1]
p_s_w = p_w_s * self.P_SPAM / (p_w_s * self.P_SPAM + p_w_n * self.P_NORMAL)
word_freq.append((word, p_s_w))
else:
word_freq.append((word, self.P_SPAM_WORD))
word_freq_most = sorted(word_freq, key = lambda x:x[1], reverse=True)[:15]
p = 1.0
rest_p = 1.0
for i in word_freq_most:
print i[0], i[1]
p *= i[1]
rest_p *= (1 - i[1])
p_spam = p / (p + rest_p)
mail_type = ''
if p_spam > self.P_IS_SPAM_LIMIT:
mail_type = 'spam'
else:
mail_type = 'normal'
self.train_module.update(mail_type, word_list)
return p_spam
class JudgeMail: # calculate the possibility of being a spam def __init__(self, mail_file, is_given_mail=False): self.mail_content = mail_file # 邮件文件路径 self.is_given_mail = is_given_mail self.train_module = TrainModule() self.P_SPAM = 0.5 # 先验概率为0.5 self.P_NORMAL = 1 - self.P_SPAM self.P_SPAM_WORD = 0.4 # 词语未出现在模型中，p(s|w)设为0.4 self.P_IS_SPAM_LIMIT = 0.9 # 判断阀值 self.train_module.set_dic_word_freq() # 开始训练模型 def judge(self): res_list = SplitWords(self.mail_content).seg_sentence() # 将邮件分词得到一个list word_list = list(set(res_list)) # 去除重复的词 word_freq = [] for word in word_list: # 遍历每个词，计算三个概率 if word in self.train_module.dic_word_freq: # 该词出现在模型中 p_w_n = self.train_module.dic_word_freq[word][0] # 读取在正常邮件中的概率 p_w_s = self.train_module.dic_word_freq[word][1] # 读取在垃圾邮件中的概率 p_s_w = p_w_s * self.P_SPAM / (p_w_s * self.P_SPAM + p_w_n * self.P_NORMAL) word_freq.append((word, p_s_w)) else: word_freq.append((word, self.P_SPAM_WORD)) word_freq_most = sorted(word_freq, key=lambda x: x[1], reverse=True)[:15] # 取15个特征向量，取p(s|w)最大的15个 k = 1.0 for i in word_freq_most: print(i[0], i[1]) k *= 1.0 / i[1] - 1 p_spam = 1 / (1 + k) if p_spam > self.P_IS_SPAM_LIMIT: # 后验概率大于0.9则为垃圾邮件 mail_type = 'spam' else: mail_type = 'normal' # self.train_module.update(mail_type, word_list) # 判断完后更新模型 return p_spam
def __init__(self, mail_file):
self.mail_file = mail_file
self.train_module = TrainModule()
self.P_SPAM = 0.5
self.P_NORMAL = 1 - self.P_SPAM
self.P_SPAM_WORD = 0.4
self.P_IS_SPAM_LIMIT = 0.9
self.train_module.set_dic_word_freq()
def __init__(self, mail_file, is_given_mail=False): self.mail_content = mail_file # 邮件文件路径 self.is_given_mail = is_given_mail self.train_module = TrainModule() self.P_SPAM = 0.5 # 先验概率为0.5 self.P_NORMAL = 1 - self.P_SPAM self.P_SPAM_WORD = 0.4 # 词语未出现在模型中，p(s|w)设为0.4 self.P_IS_SPAM_LIMIT = 0.9 # 判断阀值 self.train_module.set_dic_word_freq() # 开始训练模型
def __init__(self, mail_file): self.mail_file = mail_file self.train_module = TrainModule() self.P_SPAM = 0.5 self.P_NORMAL = 1 - self.P_SPAM self.P_SPAM_WORD = 0.4 self.P_IS_SPAM_LIMIT = 0.9 self.train_module.set_dic_word_freq()
class JudgeMail:
'''
calculate the possibility of being a spam
'''
#1.将邮件分析，得到纯文本文件
#2.对纯文本文件分词，得到词列表
#3.去掉不必要的字符
#4.
def __init__(self, mail_file, is_given_mail=False):
self.mail_file = mail_file
self.is_given_mail = is_given_mail
self.train_module = TrainModule()
self.P_SPAM = 0.5
self.P_NORMAL = 1 - self.P_SPAM
self.P_SPAM_WORD = 0.4
self.P_IS_SPAM_LIMIT = 0.9
self.train_module.set_dic_word_freq()
def judge(self):
mail_content = EmailParser(self.mail_file, self.is_given_mail).get_mail_content()
res_list = SplitWords(mail_content).get_word_list()
word_list = list(set(res_list))
for i in \
[';', ':', ',', '.', '?', '!', '(', ')', ' ', '/', '@',\
'+', '-', '=', '*', '“', '”', \
'；', '：', '，', '。', '？', '！', '（', '）', ' ', '、']:
if i in word_list:
word_list.remove(i)
word_freq = []
for word in word_list:
if word in self.train_module.dic_word_freq:
p_w_n = self.train_module.dic_word_freq[word][0]
p_w_s = self.train_module.dic_word_freq[word][1]
p_s_w = p_w_s * self.P_SPAM / (p_w_s * self.P_SPAM + p_w_n * self.P_NORMAL)
word_freq.append((word, p_s_w))
else:
word_freq.append((word, self.P_SPAM_WORD))
word_freq_most = sorted(word_freq, key = lambda x:x[1], reverse=True)[:15]
p = 1.0
rest_p = 1.0
k = 1.0
for i in word_freq_most:
print i[0], i[1]
k *= 1.0 / i[1] - 1
p_spam = 1 / (1 + k)
mail_type = ''
if p_spam > self.P_IS_SPAM_LIMIT:
mail_type = 'spam'
else:
mail_type = 'nomal'
self.train_module.update(mail_type, word_list)
return p_spam
