docstr: Return the resulting diffeomorphic map.
  
  Returns the DiffeomorphicMap registering the moving image towards
  the static image.
code: def get_map(self):
      """Return the resulting diffeomorphic map.
  
      Returns the DiffeomorphicMap registering the moving image towards
      the static image.
  
      """
      if not hasattr(self, "static_to_ref"):
          msg = (
              "Diffeormorphic map can not be obtained without running "
          )
          msg += "the optimizer. Please call first "
          msg += "SymmetricDiffeomorphicRegistration.optimize()"
          raise ValueError(msg)
      return self.static_to_ref
  
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 3 for calling the SymmetricDiffeomorphicRegistration obj's underlying member method code with example usage: obj.get_map() and returns: self