class_docstr: Gaussian measurement interface.
  
  :param mean: mean of measurement distribution.
  :param cov: covariance of measurement distribution.
  :param time: continuous time of measurement. If this is not
        provided, `frame_num` must be.
  :param frame_num: discrete time of measurement. If this is not
        provided, `time` must be.
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docstr: Compute and return the geodesic difference between 2 measurements.
  This is a generalization of the Euclidean operation ``z1 - z0``.
  
  :param z1: measurement.
  :param z0: measurement.
  :return: Geodesic difference between ``z1`` and ``z2``.
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code: def geodesic_difference(self, z1, z0):
      """
      Compute and return the geodesic difference between 2 measurements.
      This is a generalization of the Euclidean operation ``z1 - z0``.
  
      :param z1: measurement.
      :param z0: measurement.
      :return: Geodesic difference between ``z1`` and ``z2``.
      """
      return z1 - z0
  
imports: from abc import ABCMeta, abstractmethod
  import torch
  from pyro.distributions.util import eye_like
label_desc: Use image node_id 8 for calling the Measurement obj's underlying member method code with example usage: obj.geodesic_difference(z1, z0) and returns: unknown