makeImputeMethod: Create a custom imputation method.
In riebetob/mlr: Machine Learning in R

This is a constructor to create your own imputation methods.

1	makeImputeMethod(learn, impute, args = list())

`learn`	[`function(data, target, col, ...)`] Function to learn and extract information on column `col` out of data frame `data`. Argument `target` specifies the target column of the learning task. The function has to return a named list of values.
`impute`	[`function(data, target, col, ...)`] Function to impute missing values in `col` using information returned by `learn` on the same column. All list elements of the return values o `learn` are passed to this function into `...`.
`args`	[`list`] Named list of arguments to pass to `learn` via `...`.