translate: Resolve a Model Specification for a Computational Engine

View source: R/translate.R

translateR Documentation

Resolve a Model Specification for a Computational Engine


translate() will translate a model specification into a code object that is specific to a particular engine (e.g. R package). It translates generic parameters to their counterparts.


translate(x, ...)

## Default S3 method:
translate(x, engine = x$engine, ...)



A model specification.


Not currently used.


The computational engine for the model (see ?set_engine).


translate() produces a template call that lacks the specific argument values (such as data, etc). These are filled in once fit() is called with the specifics of the data for the model. The call may also include tune() arguments if these are in the specification. To handle the tune() arguments, you need to use the tune package. For more information see

It does contain the resolved argument names that are specific to the model fitting function/engine.

This function can be useful when you need to understand how parsnip goes from a generic model specific to a model fitting function.

Note: this function is used internally and users should only use it to understand what the underlying syntax would be. It should not be used to modify the model specification.


lm_spec <- linear_reg(penalty = 0.01)

# `penalty` is tranlsated to `lambda`
translate(lm_spec, engine = "glmnet")

# `penalty` not applicable for this model.
translate(lm_spec, engine = "lm")

# `penalty` is tranlsated to `reg_param`
translate(lm_spec, engine = "spark")

# with a placeholder for an unknown argument value:
translate(linear_reg(penalty = tune(), mixture = tune()), engine = "glmnet")

parsnip documentation built on June 16, 2022, 5:10 p.m.