'Set the inversion method
The Kalman filter may contain one matrix inversion: that of the
forecast error covariance matrix. The inversion method controls how and
if that inverse is performed.
Parameters
inversion_method : integer, optional
Bitmask value to set the inversion method to. See notes for
details.
**kwargs
Keyword arguments may be used to influence the inversion method by
setting individual boolean flags. See notes for details.
Notes
This method is rarely used. See the corresponding function in the
`KalmanFilter` class for details.'

def set_inversion_method(self, inversion_method=None, **kwargs):

    self.ssm.set_inversion_method(inversion_method, **kwargs)
