bayes公式原来这么重要！
先写个大概，把重要的条目列出来，明天有空了慢慢填空。
naive bayes classifier
what is the assumption? conditional independence
why we use it? to reduce estimating parameter
how do we learn it
why is bayesian estimation important?
naive bayes algorithm for discrete/continuous future
Parameter estimation:
MLE (maximum likelihood estimation)
MAP (maximum a posteriori estimation)
continuous feature:
Gaussian Naive Bayes
Application:
text classification
bag of words model