The reduce() function operates on one or more lists of intermediate results by fetching the each from memory, disk, or a network transfer and performing a function on each element of each list. Reduce()函数把从内存,磁盘或者网络介质提取过来的一个或多个中间结果列表,对列表中的每个元素逐一执行一个函数。
The intermediate result of FFTs is saved to disk in blocks, which optimizes the interconverting of row and column. 提出了以分块的方式存储二维FFT运算的中间结果,大幅提升行列转置时文件读写的效率。
ATPR-tree is based on TPR-tree structure and added with aggregate information in intermediate nodes to reduce the disk accesses of PRA queries. 聚集TPR树索引在TPR树中间节点中加入移动对象聚集信息以减少预测范围聚集查询所需要的节点访问代价。