mlr3pipelines (version 0.3.0)

po: Shorthand PipeOp Constructor

Description

Create

• a PipeOp from mlr_pipeops from given ID

• a PipeOpLearner from a Learner object

• a PipeOpFilter from a Filter object

• a PipeOpSelect from a Selector object

The object is initialized with given parameters and param_vals.

Usage

po(.obj, ...)

Arguments

.obj

[any] The object from which to construct a PipeOp. If this is a character(1), it is looked up in the mlr_pipeops dictionary. Otherwise, it is converted to a PipeOp.

...

any Additional parameters to give to constructed object. This may be an argument of the constructor of the PipeOp, in which case it is given to this constructor; or it may be a parameter value, in which case it is given to the param_vals argument of the constructor.

Examples

# NOT RUN {
library("mlr3")

po("learner", lrn("classif.rpart"), cp = 0.3)

po(lrn("classif.rpart"), cp = 0.3)

# is equivalent with:
mlr_pipeops$get("learner", lrn("classif.rpart"),
  param_vals = list(cp = 0.3))
# }