This is a CPOConstructor to be used to create a
CPO. It is called like any R function and returns
the created CPO.
Convert a data.frame into a data.frame with the same column names, but with columns of factors indicating whether data was missing or not.
This is most useful in combination with cpoCbind.
cpoMissingIndicators(force.dummies = FALSE, id, export = "export.default",
affect.type = NULL, affect.index = integer(0),
affect.names = character(0), affect.pattern = NULL,
affect.invert = FALSE, affect.pattern.ignore.case = FALSE,
affect.pattern.perl = FALSE, affect.pattern.fixed = FALSE)[logical(1)]
Whether to create dummy columns even for data that is not missing.
This can be useful if missing data is expected during test in columns
where it did not occur during training.
[character(1)]
id to use as prefix for the CPO's hyperparameters. this
must be used to avoid name clashes when composing two
CPOs of the same type, or with learners or other CPOS
with hyperparameters with clashing names.
[character]
Either a character vector indicating the parameters to
export as hyperparameters, or one of the special values
“export.all” (export all parameters),
“export.default” (export all parameters that are exported by default),
“export.set” (export all parameters that were set during construction),
“export.default.set” (export the intersection of the “default” and “set” parameters),
“export.unset” (export all parameters that were not set during construction) or
“export.default.unset” (export the intersection of the “default” and “unset” parameters).
Default is “export.default”.
[character | NULL]
Type of columns to affect. A subset of “numeric”, “factor”, “ordered”, “other”, or NULL
to not match by column type. Default is NULL.
[numeric]
Indices of feature columns to affect. The order of indices given is respected. Target column indices are not counted
(since target columns are always included). Default is integer(0).
[character]
Feature names of feature columns to affect. The order of names given is respected. Default is character(0).
[character(1) | NULL]
grep pattern to match feature names by. Default is NULL (no pattern matching)
[logical(1)]
Whether to affect all features not matched by other affect.* parameters.
[logical(1)]
Ignore case when matching features with affect.pattern; see grep. Default is FALSE.
[logical(1)]
Use Perl-style regular expressions for affect.pattern; see grep. Default is FALSE.
[logical(1)]
Use fixed matching instead of regular expressions for affect.pattern; see grep. Default is FALSE.
[CPO].
This function creates a CPO object, which can be applied to
Tasks, data.frames, link{Learner}s
and other CPO objects using the %>>% operator.
The parameters of this object can be changed after creation
using the function setHyperPars. The other
hyper-parameter manipulating functins, getHyperPars
and getParamSet similarly work as one expects.
If the “id” parameter is given, the hyperparameters will have this id as aprefix; this will, however, not change the parameters of the creator function.
CPO constructor functions are called with optional values of parameters, and additional “special” optional values.
The special optional values are the id parameter, and the affect.* parameters. The affect.* parameters
enable the user to control which subset of a given dataset is affected. If no affect.* parameters are given, all
data features are affected by default.
Other CPOs: cpoApplyFunRegrTarget,
cpoApplyFun, cpoAsNumeric,
cpoCache, cpoCbind,
cpoCollapseFact,
cpoDropConstants,
cpoDummyEncode,
cpoFilterAnova,
cpoFilterCarscore,
cpoFilterChiSquared,
cpoFilterFeatures,
cpoFilterGainRatio,
cpoFilterInformationGain,
cpoFilterKruskal,
cpoFilterLinearCorrelation,
cpoFilterMrmr, cpoFilterOneR,
cpoFilterPermutationImportance,
cpoFilterRankCorrelation,
cpoFilterRelief,
cpoFilterRfCImportance,
cpoFilterRfImportance,
cpoFilterRfSRCImportance,
cpoFilterRfSRCMinDepth,
cpoFilterSymmetricalUncertainty,
cpoFilterUnivariate,
cpoFilterVariance,
cpoFixFactors, cpoIca,
cpoImpactEncodeClassif,
cpoImpactEncodeRegr,
cpoImputeConstant,
cpoImputeHist,
cpoImputeLearner,
cpoImputeMax, cpoImputeMean,
cpoImputeMedian,
cpoImputeMin, cpoImputeMode,
cpoImputeNormal,
cpoImputeUniform, cpoImpute,
cpoLogTrafoRegr, cpoMakeCols,
cpoModelMatrix,
cpoOversample, cpoPca,
cpoProbEncode,
cpoQuantileBinNumerics,
cpoRegrResiduals,
cpoResponseFromSE, cpoSample,
cpoScaleMaxAbs,
cpoScaleRange, cpoScale,
cpoSelect, cpoSmote,
cpoSpatialSign,
cpoTransformParams, cpoWrap,
makeCPOCase, makeCPOMultiplex