Callable Module — module

module_fn() wraps an ordinary R function in a dsprrr Module. This gives custom callables the same run() and evaluate() surface as built-in modules without requiring users to subclass dsprrr internals.

Usage

module_fn(signature, forward, chat = NULL, name = NULL, config = list())

Arguments

signature: A Signature object or signature string.
forward: Function called with named signature inputs. If the function accepts .llm or ..., the active chat object is passed as .llm. Return a named list matching the signature output fields, or a scalar when the signature has exactly one output field. forward is invoked once per row; use run_dataset() or evaluate() to process multi-row datasets.
chat: Optional ellmer Chat object stored on the module.
name: Optional module name stored in config$name.
config: Optional configuration metadata.

Value

An R6 FnModule object inheriting from the internal Module base class.

Examples

summarizer <- module_fn(
  "text -> summary",
  function(text, ...) list(summary = substr(text, 1, 20))
)
run(summarizer, text = "A long piece of text")
#> $summary
#> [1] "A long piece of text"
#>