First lets see how parallelize splits your data between partitions: val x = sc.parallelize(List("12","23","345","4567"), 2) x.glom.collect // Array[Array[String]] = Array(Array(12, 23), Array(345, 4567)) val y = sc.parallelize(List("12","23","345",""), 2) y.glom.collect // Array[Array[String]] = Array(Array(12, 23), Array(345, "")) and define two helpers: def seqOp(x: String, y: String) = math.min(x.length, y.length).toString def combOp(x: String, y: String) = x + y Now lets trace execution for x. Ignoring parallelism it can be represented as follows: (combOp (seqOp (seqOp "" "12") "23") (seqOp (seqOp "" "345") "4567")) (combOp (seqOp "0" "23") (seqOp (seqOp "" "345") "4567")) (combOp "1" (seqOp (seqOp "" "345") "4567")) (combOp "1" (seqOp "0" "4567")) (combOp "1" "1") "11" The same thing for y: (combOp (seqOp (seqOp "" "12") "23") (seqOp (seqOp "" "345") "")) (combOp (seqOp "0" "23") (seqOp (seqOp "" "345") "")) (combOp "1" (seqOp (seqOp "" "345") "")) (combOp "1" (seqOp "0" "")) (combOp "1" "0") "10"
相关推荐
a novel variant called aggregate channel features, make a full exploration of feature design, and discover a multi- scale version of features with better performance. To deal with poses of faces in ...
mongodb group aggregate项目实战笔记 管道聚合 mongodb group按时间分组,用aggregate管道聚合 会比group的处理效率要高而且更灵活方便
2聚合感知函数@Aggregate_Aware1聚合感知函数@Aggregate_Aware1聚合感知函数@Aggregate_Aware
aggregate-v0.75.tgz cacti插件。
matlab开发-aggregate。基于对另一个矩阵中的变量进行分组,对一个矩阵中的值进行分组(并对其应用函数)
THE COMPUTATION OF AGGREGATE LOSS DISTRIBUTIONS 作者:ROBERSON 用FFT计算总损失分布
meteor-aggregate, 对 Meteor的适当的MongoDB聚合支持 meteorhacks:aggregate为 Meteor 添加适当聚合支持的简单软件包。 这个包在 Mongo.Collection 实例上公开了 .aggregate 方法。这只在服务器端工作,没有...
主要介绍了使用aggregate在MongoDB中查询重复数据记录的方法的相关资料,需要的朋友可以参考下
Delphi数据排序、Aggregate字段等dbExpress技巧实例.rar
maven-site-aggregate-plugin-2.7.0.jar
maven-site-aggregate-plugin-2.10.0.jar
maven-site-aggregate-plugin-2.0.0.jar
我的博客:www.wangs0622.com, mongoDB-aggregate pipeline 使用的文档集合。
mongo聚合函数(aggregate)java版, 类似mysql的group。 对应查询语句可查看 https://blog.csdn.net/xu180/article/details/89175663
Cacti Aggregate Sum 添加多端口流量汇集
Aggregate Channel Features for Multi-view Face Detection英文原文加翻译 断断续续翻译了将近一周。。翻译的不好不要打我QAQ
jar包,亲测可用
mongo spring boot Aggregate 例子
1聚合感知函数@Aggregate_Aware1聚合感知函数@Aggregate_Aware1聚合感知函数@Aggregate_Aware1聚合感知函数@Aggregate_Aware
一类非线性优化的凝聚动约束同伦算法,刘庆怀,王秀玉,对含有一个凸约束的优化问题,构造了凝聚动约束函数及组合同伦方程,并给出了同伦路径收敛性的证明,数值算例表明此算法是可行和有效