docstr: Computes one step bringing the static image towards the moving.
  
  Computes the updated displacement field to be used for registration of
  the static image towards the moving image
docstr_tok: ["Computes","one","step","bringing","the","static","image","towards","the","moving",".","Computes","the","updated","displacement","field","to","be","used","for","registration","of","the","static","image","towards","the","moving","image"]
code: def compute_backward(self):
      r"""Computes one step bringing the static image towards the moving.
  
      Computes the updated displacement field to be used for registration of
      the static image towards the moving image
      """
      return self.compute_step(False)
  
imports: import abc
  import numpy
  from numpy import gradient
  from scipy import ndimage
  from dipy.align import vector_fields
  from dipy.align import sumsqdiff
  from dipy.align import crosscorr
  from dipy.align import expectmax
  from dipy.align import floating
label_desc: Use image node_id 5 for calling the SSDMetric obj's underlying member method code with example usage: obj.compute_backward() and returns: self