Extracts and returns a list of unique engine names from a list of model workflows.
get_engine_names(models)A list of character vectors. Each vector contains the unique engine names extracted from the corresponding element of models.
A list where each element is a list of model workflows. Each workflow is expected to contain a fitted model that can be processed with tune::extract_fit_parsnip.
The function applies tune::extract_fit_parsnip to each model workflow to extract the fitted model object. It then retrieves the engine name from the model specification (spec$engine). If the extraction fails, NA_character_ is returned for that workflow. Finally, the function removes any duplicate engine names using unique.