docstr: Frees the resources allocated during initialization
          
code: def _end_optimizer(self):
      """Frees the resources allocated during initialization"""
      del self.moving_ss
      del self.static_ss
  
imports: import logging
  import abc
  import numpy
  import numpy.linalg
  import nibabel
  from nibabel.streamlines import ArraySequence
  from dipy.align import vector_fields
  from dipy.align import floating
  from dipy.align import VerbosityLevels
  from dipy.align import Bunch
  from dipy.align.scalespace import ScaleSpace
label_desc: Use image node_id 6 for calling the SymmetricDiffeomorphicRegistration obj's underlying member method code with example usage: obj._end_optimizer() without return types