Approximate Nearest Neighbor under edit distance via product metrics
Approximate Nearest Neighbor under edit distance via product metrics
复制标题
通过产品指标编辑距离下的近似最近邻
DOI:
--
复制
发表时间:
2004
期刊:
影响因子:
--
通讯作者:
P. Indyk
中科院分区:
文献类型:
--
作者:
P. Indyk
We present a data structure for the approximate nearest neighbor problem under edit metric (which is defined as the minimum number of insertions, deletions and character substitutions needed to transform one string into another). For any <i>l</i> ≥ 1 and a set of <i>n</i> strings of length <i>d</i>, the data structure reports a 3<sup><i>l</i></sup>-approximate Nearest Neighbor for any given query string <i>q</i> in <i>O</i>(<i>d</i>) time. The space requirement of this data structure is roughly <i>O</i>(<i>n</i><sup><i>d</i><sup>1/(<i>l</i>+1)</sup></sup>), i.e., strongly subexponential. To our knowledge, this is the first data structure for this problem with both <i>o</i>(<i>n</i>) query time and storage subexponential in <i>d</i>.