code: def apply_inverse(self, y, in_place=False):
          r
          return cho_solve(self._factor, y, overwrite_b=in_place)
docs: r"""
          Apply the inverse of the covariance matrix to the input by solving
  
          .. math::
  
              K\,x = y
  
          Args:
              y (ndarray[nsamples] or ndadrray[nsamples, nrhs]): The vector or
                  matrix :math:`y`.
              in_place (Optional[bool]): Should the data in ``y`` be overwritten
                  with the result :math:`x`? (default: ``False``)