code: def _get_precond(self):
      return self._precond
  
imports: import numpy
  import scipy.linalg
  from nibabel.affines import apply_affine
  from transforms3d.quaternions import mat2quat, quat2axangle
  from .transform import Transform
label_desc: Use image node_id 16 for calling the Affine obj's underlying member method code with example usage: obj._get_precond() and returns: self