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[MsEngine] is the abstract base class for engine specs. It cannot be instantiated directly; engines create concrete subclasses via `S7::new_class(parent = MsEngine)`. The spec fields are `name`, `mode` (`"extract"` or `"fit"`), `params` (named list), `deterministic`, `packages` (required R packages) and `label` (optional human-readable name; printing falls back to `name`). Violations raise `msuiter_error_engine`.

Usage

MsEngine(
  name = character(0),
  mode = character(0),
  params = list(),
  deterministic = logical(0),
  packages = character(0),
  label = ""
)

Arguments

name

single lower-case snake_case engine name (the registry key).

mode

one of `"extract"` (signature discovery) or `"fit"` (reference-based fitting).

params

named list of hyper-parameters.

deterministic

single TRUE or FALSE: seeded and thread invariant.

packages

character vector of required R packages (may be empty).

label

optional human-readable engine label; printing falls back to `name` when empty.