Context | R Documentation |
Context objects allow Callback objects to access and modify data. The following packages implement context subclasses:
ContextOptimization
in bbotk.
ContextEval
in mlr3tuning.
ContextTorch
in mlr3torch
Context is an abstract base class. A subclass inherits from Context. Data is stored in public fields. Access to the data can be restricted with active bindings (see example).
id
(character(1)
)
Identifier of the object.
Used in tables, plot and text output.
label
(character(1)
)
Label for this object.
Can be used in tables, plot and text output instead of the ID.
new()
Creates a new instance of this R6 class.
Context$new(id, label = NA_character_)
id
(character(1)
)
Identifier for the new instance.
label
(character(1)
)
Label for the new instance.
format()
Format object as simple string.
Context$format()
print()
Print object.
Context$print()
clone()
The objects of this class are cloneable with this method.
Context$clone(deep = FALSE)
deep
Whether to make a deep clone.
library(data.table) library(R6) # data table with column x an y data = data.table(x = runif(10), y = sample(c("A", "B"), 10, replace = TRUE)) # context only allows to access column y ContextExample = R6Class("ContextExample", inherit = Context, public = list( data = NULL, initialize = function(data) { self$data = data } ), active = list( y = function(rhs) { if (missing(rhs)) return(self$data$y) self$data$y = rhs } ) ) context = ContextExample$new(data) # retrieve content of column y context$y # change content of column y to "C" context$y = "C"
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