code: def add(mean1, var1, mean2, var2):
      """
      Add the Gaussians (mean1, var1) with (mean2, var2) and return the
      results as a tuple (mean,var).
  
      var1 and var2 are variances - sigma squared in the usual parlance.
      """
  
      return (mean1 + mean2, var1 + var2)
  
imports: from __future__ import absolute_import, division, unicode_literals
  import math
  from math import cos, sin
  import random
  import warnings
  import numpy
  from numpy.linalg import inv
  import scipy.linalg
  import scipy.sparse
  import scipy.sparse.linalg
  from scipy.stats import norm, multivariate_normal
label_desc: Use image node_id 9 for calling a global function with example usage: add(mean1, var1, mean2, var2) and returns: unknown,  unknown