lasticsearch学习笔记-第39节:初识搜索引擎_倒排索引核心原理快速揭秘
课程大纲
doc1:I really liked my small dogs, and I think my mom also liked them.
doc2:He never liked any dogs, so I hope that my mom will not expect me to liked him.
分词,初步的倒排索引的建立
演示了一下倒排索引最简单的建立的一个过程
搜索
mother like little dog,不可能有任何结果
mother
like
little
dog
这个是不是我们想要的搜索结果???绝对不是,因为在我们看来,mother和mom有区别吗?同义词,都是妈妈的意思。like和liked有区别吗?没有,都是喜欢的意思,只不过一个是现在时,一个是过去时。little和small有区别吗?同义词,都是小小的。dog和dogs有区别吗?狗,只不过一个是单数,一个是复数。
normalization,建立倒排索引的时候,会执行一个操作,也就是说对拆分出的各个单词进行相应的处理,以提升后面搜索的时候能够搜索到相关联的文档的概率
时态的转换,单复数的转换,同义词的转换,大小写的转换
mom —> mother
liked —> like
small —> little
dogs —> dog
mother like little dog,分词,normalization
mother --> mom
like --> like
little --> little
dog --> dog
doc1和doc2都会搜索出来
doc1:I really liked my small dogs, and I think my mom also liked them.
doc2:He never liked any dogs, so I hope that my mom will not expect me to liked him.