code: def norm(x, x0, sigma):
      return (
          1.0
          / np.sqrt(2 * np.pi)
          / sigma
          * np.exp(-0.5 * (x - x0) ** 2 / sigma**2)
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: norm(x, x0, sigma) and returns: unknown