Bearbeiten

Teilen über

RxForeachDoPar: Generate RxForeachDoPar Compute Context

  • Artikel

Description

Creates a compute context object using the registered foreach parallel back end. This compute context can be used only to distribute computations via the rxExec function; it is ignored by Revolution HPA functions. This is the main generator for S4 class RxForeachDoPar.

Usage

  RxForeachDoPar( object, dataPath = NULL, outDataPath = NULL )

Arguments

object

a compute context object. If object has slots for dataPath and/or outDataPath, they will be copied to the equivalent slots for the new RxForeachDoPar object. Explicit specifications of the dataPath and/or outDataPath arguments will override this.

dataPath

NULL or character vector defining the search path(s) for the input data source(s). If not NULL, it overrides any specification for dataPath in rxOptions

outDataPath

NULL or character vector defining the search path(s) for new output data file(s). If not NULL, this overrides any specification for dataPath in rxOptions

Details

A job is associated with the compute context in effect at the time the job was submitted. If the compute context subsequently changes, the compute context of the job is not affected.

Available parallel backends are system-dependent, but include doRSR and doParallel. These are separate packages that must be loaded and registered to accept foreach input.

Note that dataPath and outDataPath are only used by data sources used in RevoScaleR analyses. They do not alter the working directory for other R functions that read from or write to files.

Value

object of class RxForeachDoPar.

Author(s)

Microsoft Corporation Microsoft Technical Support

See Also

foreach, doParallel-package, registerDoParallel, doRSR-package, registerDoRSR, rxSetComputeContext, rxOptions, rxExec, RxComputeContext, RxLocalSeq, RxLocalParallel, RxForeachDoPar-class.

Examples


 ## Not run:


# Create a compute context using your registered foreach backend
doparContext <- RxForeachDoPar()

# Tell RevoScaleR to use the RxForeachDoPar compute context
rxSetComputeContext(doparContext)

## End(Not run)