code: def normalize_vector(v):
      """Normalize a Vector3D."""
      norm = np.sqrt(v.x**2 + v.y**2 + v.z**2)
      return Vector3D(v.x / norm, v.y / norm, v.z / norm)
  
imports: from collections import namedtuple
  import dask.array
  import numba
  import numpy
  from satpy.utils import get_legacy_chunk_size
label_desc: Use image node_id 41 for calling a global function with example usage: normalize_vector(v) and returns: Vector3D