| 1. | With the rapid development of information on the internet , around 20 , 000 , 000 web pages appeared , and lots of them have little entropy of intelligence . general search becomes weaker and weaker . the precision ratio and recall ratio have been declining that some special users have to look for a new method to fit their needs
随着互联网信息技术的迅速发展,大约每天就有2000万的新网页诞生,且很多网页的信息熵不高,导致通用搜索引擎的信息覆盖率和检索精度都在迅速下降,因此发展面向专题的信息搜索与收集工具就成为趋势。 |
