grep得到的内容用sed处理
-E or Extended Regular Expressions
I mentioned extended regular expressions earlier. FreeBSD (and Mac OS X) uses “-E” to enable this. However, FreeBSD later added the -r command to be compatible with GNU sed. -e <script>或…
贝叶斯理论 P ( H ∣ E ) P ( E ∣ H ) P ( H ) P ( E ) P(H|E) \frac{P(E|H)P(H)}{P(E)} P(H∣E)P(E)P(E∣H)P(H) 两个假设:
类别之间相互独立每个类别同等重要 P(E1 | yes) E1 个数 / yes 个数 0 频率问题
上述理论会遇到某个类别为0的情况,导致…