code: def LogNormal(mu, sigma, tag=None):
      
      assert sigma > 0, 'Log-Normal "sigma" must be positive'
      return uv(ss.lognorm(sigma, loc=mu), tag=tag)
docs: A Log-Normal random variate
      
      Parameters
      ----------
      mu : scalar
          The location parameter
      sigma : scalar
          The scale parameter (must be positive and non-zero)