mlr_pipeops_pca | R Documentation |
Extracts principle components from data. Only affects numerical features.
See stats::prcomp()
for details.
R6Class
object inheriting from PipeOpTaskPreproc
/PipeOp
.
PipeOpPCA$new(id = "pca", param_vals = list())
id
:: character(1)
Identifier of resulting object, default "pca"
.
param_vals
:: named list
List of hyperparameter settings, overwriting the hyperparameter settings that would otherwise be set during construction. Default list()
.
Input and output channels are inherited from PipeOpTaskPreproc
.
The output is the input Task
with all affected numeric features replaced by their principal components.
The $state
is a named list
with the $state
elements inherited from PipeOpTaskPreproc
, as well as the elements of the class stats::prcomp,
with the exception of the $x
slot. These are in particular:
sdev
:: numeric
The standard deviations of the principal components.
rotation
:: matrix
The matrix of variable loadings.
center
:: numeric
| logical(1)
The centering used, or FALSE
.
scale
:: numeric
| logical(1)
The scaling used, or FALSE
.
The parameters are the parameters inherited from PipeOpTaskPreproc
, as well as:
center
:: logical(1)
Indicating whether the features should be centered. Default is TRUE
. See prcomp()
.
scale.
:: logical(1)
Whether to scale features to unit variance before analysis. Default is FALSE
, but scaling is advisable. See prcomp()
.
rank.
:: integer(1)
Maximal number of principal components to be used. Default is NULL
: use all components. See prcomp()
.
Uses the prcomp()
function.
Only methods inherited from PipeOpTaskPreproc
/PipeOp
.
https://mlr-org.com/pipeops.html
Other PipeOps:
PipeOp
,
PipeOpEnsemble
,
PipeOpImpute
,
PipeOpTargetTrafo
,
PipeOpTaskPreproc
,
PipeOpTaskPreprocSimple
,
mlr_pipeops
,
mlr_pipeops_boxcox
,
mlr_pipeops_branch
,
mlr_pipeops_chunk
,
mlr_pipeops_classbalancing
,
mlr_pipeops_classifavg
,
mlr_pipeops_classweights
,
mlr_pipeops_colapply
,
mlr_pipeops_collapsefactors
,
mlr_pipeops_colroles
,
mlr_pipeops_copy
,
mlr_pipeops_datefeatures
,
mlr_pipeops_encode
,
mlr_pipeops_encodeimpact
,
mlr_pipeops_encodelmer
,
mlr_pipeops_featureunion
,
mlr_pipeops_filter
,
mlr_pipeops_fixfactors
,
mlr_pipeops_histbin
,
mlr_pipeops_ica
,
mlr_pipeops_imputeconstant
,
mlr_pipeops_imputehist
,
mlr_pipeops_imputelearner
,
mlr_pipeops_imputemean
,
mlr_pipeops_imputemedian
,
mlr_pipeops_imputemode
,
mlr_pipeops_imputeoor
,
mlr_pipeops_imputesample
,
mlr_pipeops_kernelpca
,
mlr_pipeops_learner
,
mlr_pipeops_missind
,
mlr_pipeops_modelmatrix
,
mlr_pipeops_multiplicityexply
,
mlr_pipeops_multiplicityimply
,
mlr_pipeops_mutate
,
mlr_pipeops_nmf
,
mlr_pipeops_nop
,
mlr_pipeops_ovrsplit
,
mlr_pipeops_ovrunite
,
mlr_pipeops_proxy
,
mlr_pipeops_quantilebin
,
mlr_pipeops_randomprojection
,
mlr_pipeops_randomresponse
,
mlr_pipeops_regravg
,
mlr_pipeops_removeconstants
,
mlr_pipeops_renamecolumns
,
mlr_pipeops_replicate
,
mlr_pipeops_scale
,
mlr_pipeops_scalemaxabs
,
mlr_pipeops_scalerange
,
mlr_pipeops_select
,
mlr_pipeops_smote
,
mlr_pipeops_spatialsign
,
mlr_pipeops_subsample
,
mlr_pipeops_targetinvert
,
mlr_pipeops_targetmutate
,
mlr_pipeops_targettrafoscalerange
,
mlr_pipeops_textvectorizer
,
mlr_pipeops_threshold
,
mlr_pipeops_tunethreshold
,
mlr_pipeops_unbranch
,
mlr_pipeops_updatetarget
,
mlr_pipeops_vtreat
,
mlr_pipeops_yeojohnson
library("mlr3")
task = tsk("iris")
pop = po("pca")
task$data()
pop$train(list(task))[[1]]$data()
pop$state
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