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R Actor usage within Distributed Data-Parallel Sub-workflows

This document explains the additional settings that might needed for running Distributed Data-Parallel (DDP) sub-workflows with R actor. More information of the DDP can be found at http://www.biokepler.org/

To run R in DDP sub-workflows in a distributed environment. Two things need to be paid attention to:

1) Make sure R is available from path on all distributed nodes for the workflow.

2) If libraries are used in R, locations of the libraries may need to be specified. For instance, library(bnlearn) -> library(bnlearn, lib.loc="/home/jianwu/R/x86_64-unknown-linux-gnu-library/3.1").

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