April 2017
Intermediate to advanced
532 pages
12h 39m
English
book
Machine Learning with Spark - Second Edition
by Rajdeep Dua, Brian O'Neill, Stephen Boesch, Manpreet Singh Ghotra, Nick Pentreath
Content preview from Machine Learning with Spark - Second Edition
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Distributed matrix in Spark
A distributed matrix has long-type row and column indices. It has double-typed values, stored distributively in one or more RDDs. Four different types of distributed matrices have been implemented in Spark. All of them are subclasses of DistributedMatrix.
RowMatrix: A RowMatrix is a row-oriented distributed matrix without meaningful row indices. (In a row-oriented matrix, consecutive elements of the rows of an array are contiguous in memory). RowMatrix is implemented as an RDD of its rows. Each row is a local vector. The number of columns must be less than or equal to 2^31 for a RowMatrix so that a single local ...
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