# 42 Pretty Images Of Mapreduce Matrix Multiplication

**42 Pretty Images Of Mapreduce Matrix Multiplication
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mapreduce algorithm for matrix multiplication we need to tag the map function output with the position so the reduce function can identify the ponents in the different java hadoop matrix multiplication stack overflow i was running the mapreduce matrix multiplication program found at multiply indexml i found out that this implementation map reduce advanced matrix multiplication [ rows matrix 1] [ columns matrix 1] [row 1 matrix 1] [row n matrix 1] [ rows matrix 2] [ columns matrix 2] [row 1 matrix 2] [row n matrix 2] the required output is to print the product of the two matrices in the format shown the code for the mapreduce class parts to io etc has already been provided matrix multiplication using mapreduce – 2 step solution an extra mapreduce job has to be run initially in order to add the row number as key to every row the process of generating the row number is explained in the next post first iteration the map function for each matrix element m ij emit the key value pair j m i mij for each matrix element n jk emit the key value pair j n k njk mmds ch2 2 5 6 the stanford university infolab matrix vector multiplication where the dimension is many billions 2 mapreduce is a style of puting that has been implemented in several sys matrix multiplication in hadoop mapreduce matrix multiplication is mon and important algebraic operation while ing to mapreduce paradigm if we give 2 matrices for multiplication once we the data from hdfs and process them in map we only one input split we cannot make sure which row is that so butter way to do that is to order your data with row and column index mapreduce examples matrixmatrixmultiplication at master matrix matrix multiplication problem calculate the product of two matrixs m1 and m2 both assumed sparse here we demonstrate using a toy example mr5 matrix multiplication using mapreduce programming in in mathematics matrix multiplication or the matrix product is a binary operation that produces a matrix from two matrices the definition is motivated by cs7960 l17 mapreduce web basically a nxn big matrix m each row represents a webpage and if it links to l pages then it has l non zero entries with a value 1 l what to pute the position of an random web browser v v i probability browser reaches page i ce at page i goes to random page linked to by i in the limit v = m v so v is the top eigen vector of m schönhage strassen algorithm with mapreduce for in the mapreduce model the input and the output of a putation are lists of key value pairs let k t be key types and v t be value types for t= 1 2 3 the user speci es two functions map k 1 v 1 listhk 2 v 2i and reduce k 2 listhvi listhk 3 vi when a job starts the mapreduce framework launches map tasks

MIT Linear Algebra Lecture 3 Matrix Multiplication and from mapreduce matrix multiplication , source:www.catonmat.net

Manish Bhide Manoj K Agarwal IBM India Research Lab India from mapreduce matrix multiplication , source:slideplayer.com