code: def init(
      model: Model[InT, InT],
      X: Optional[InT] = None,
      Y: Optional[InT] = None,
  ) -> None:
      first_layer = model.layers[0]
      if first_layer.has_dim("nO") is None:
          first_layer.initialize(X=X, Y=Y)
      else:
          first_layer.initialize(X=X)
      if first_layer.has_dim("nO"):
          model.set_dim("nO", first_layer.get_dim("nO"))
      if first_layer.has_dim("nI"):
          model.set_dim("nI", first_layer.get_dim("nI"))
  
imports: from typing import Callable, List, Optional, Tuple, TypeVar
  from ..config import registry
  from ..model import Model
  from ..types import Floats1d, Floats2d, Floats3d, Floats4d, FloatsXd, Padded, Ragged
label_desc: Use image node_id 3 for calling a global function with example usage: init(model, X, Y) without return types