code: def init():
      """
      Initialize the image writer modules according to the filename extension.
      """
      for ext in ("png", "jpg", "jpeg", "bmp", "tiff", "tif"):
          register_writer(ext, PILWriter)  # TODO: test 16-bit
      for ext in ("nii.gz", "nii"):
          register_writer(ext, NibabelWriter, ITKWriter)
      register_writer("nrrd", ITKWriter, NibabelWriter)
      register_writer(EXT_WILDCARD, ITKWriter, NibabelWriter, ITKWriter)
  
imports: from __future__ import annotations
  from collections.abc import Mapping, Sequence
  from typing import TYPE_CHECKING, Any, cast
  import numpy
  from monai.apps.utils import get_logger
  from monai.config import DtypeLike, NdarrayOrTensor, PathLike
  from monai.data.meta_tensor import MetaTensor
  from monai.data.utils import affine_to_spacing, ensure_tuple, ensure_tuple_rep, orientation_ras_lps, to_affine_nd
  from monai.transforms.spatial.array import Resize, SpatialResample
  from monai.transforms.utils_pytorch_numpy_unification import ascontiguousarray, moveaxis
  from monai.utils import GridSampleMode, GridSamplePadMode, InterpolateMode, MetaKeys, OptionalImportError, SpaceKeys, convert_data_type, convert_to_tensor, get_equivalent_dtype, look_up_option, optional_import, require_pkg
label_desc: Use image node_id 3 for calling a global function with example usage: init() without return types