# mlr_pipeops_regravg

##### PipeOpRegrAvg

Perform (weighted) prediction averaging from regression `Prediction`

s by connecting
`PipeOpRegrAvg`

to multiple `PipeOpLearner`

outputs.

The resulting `"response"`

prediction is a weighted average of the incoming `"response"`

predictions.
`"se"`

prediction is currently not aggregated but discarded if present.

Weights can be set as a parameter; if none are provided, defaults to equal weights for each prediction. Defaults to equal weights for each model.

- Keywords
- datasets

##### Format

`R6Class`

inheriting from `PipeOpEnsemble`

/`PipeOp`

.

##### Construction

PipeOpRegrAvg$new(innum = 0, id = "regravg", param_vals = list())

`innum`

::`numeric(1)`

Determines the number of input channels. If`innum`

is 0 (default), a vararg input channel is created that can take an arbitrary number of inputs.`id`

::`character(1)`

Identifier of the resulting object, default`"regravg"`

.`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

Input and output channels are inherited from `PipeOpEnsemble`

. Instead of a `Prediction`

, a `PredictionRegr`

is used as input and output during prediction.

##### State

The `$state`

is left empty (`list()`

).

##### Parameters

The parameters are the parameters inherited from the `PipeOpEnsemble`

.

##### Internals

Inherits from `PipeOpEnsemble`

by implementing the `private$weighted_avg_predictions()`

method.

##### Fields

Only fields inherited from `PipeOpEnsemble`

/`PipeOp`

.

##### Methods

Only methods inherited from `PipeOpEnsemble`

/`PipeOp`

.

##### See Also

Other PipeOps: `PipeOpEnsemble`

,
`PipeOpImpute`

,
`PipeOpTaskPreproc`

, `PipeOp`

,
`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_copy`

,
`mlr_pipeops_encodeimpact`

,
`mlr_pipeops_encodelmer`

,
`mlr_pipeops_encode`

,
`mlr_pipeops_featureunion`

,
`mlr_pipeops_filter`

,
`mlr_pipeops_fixfactors`

,
`mlr_pipeops_histbin`

,
`mlr_pipeops_ica`

,
`mlr_pipeops_imputehist`

,
`mlr_pipeops_imputemean`

,
`mlr_pipeops_imputemedian`

,
`mlr_pipeops_imputenewlvl`

,
`mlr_pipeops_imputesample`

,
`mlr_pipeops_kernelpca`

,
`mlr_pipeops_learner`

,
`mlr_pipeops_missind`

,
`mlr_pipeops_modelmatrix`

,
`mlr_pipeops_mutate`

,
`mlr_pipeops_nop`

,
`mlr_pipeops_pca`

,
`mlr_pipeops_quantilebin`

,
`mlr_pipeops_removeconstants`

,
`mlr_pipeops_scalemaxabs`

,
`mlr_pipeops_scalerange`

,
`mlr_pipeops_scale`

,
`mlr_pipeops_select`

,
`mlr_pipeops_smote`

,
`mlr_pipeops_spatialsign`

,
`mlr_pipeops_subsample`

,
`mlr_pipeops_unbranch`

,
`mlr_pipeops_yeojohnson`

,
`mlr_pipeops`

Other Ensembles: `PipeOpEnsemble`

,
`mlr_learners_avg`

,
`mlr_pipeops_classifavg`

##### Examples

```
# NOT RUN {
library("mlr3")
# Simple Bagging
gr = greplicate(n = 5,
po("subsample") %>>%
po("learner", lrn("classif.rpart"))
) %>>%
po("classifavg")
resample(tsk("iris"), GraphLearner$new(gr), rsmp("holdout"))
# }
```

*Documentation reproduced from package mlr3pipelines, version 0.1.1, License: LGPL-3*