Top-k Document Retrieval in External Memory
Top-k Document Retrieval in External Memory
复制标题
外部存储器中的 Top-k 文档检索
DOI:
--
复制
发表时间:
2013
期刊:
影响因子:
--
通讯作者:
J. Vitter
中科院分区:
文献类型:
--
作者:
Rahul Shah;Cheng Sheng;Sharma V. Thankachan;J. Vitter
Let ({cal{D}}) be a given set of (string) documents of total length n. The top-k document retrieval problem is to index (cal{D}) such that when a pattern P of length p, and a parameter k come as a query, the index returns those k documents which are most relevant to P. We present the first non-trivial external memory index supporting top-k document retrieval queries in optimal O(p/B + log B n + k/B) I/Os, where B is the block size. The index space is almost linear O(nlog* n) words.