code: def test2_exponential_couple_terms():
      """
      Tests the length of the latent variable vector for an GASX model
      with 1 AR and 1 SC term, and two predictors, and tests that the values
      are not nan
      """
      model = pf.GASX(
          formula="y ~ x1 + x2",
          data=data,
          ar=1,
          sc=1,
          family=pf.Exponential(),
      )
      x = model.fit()
      assert len(model.latent_variables.z_list) == 5
      lvs = np.array([i.value for i in model.latent_variables.z_list])
      assert len(lvs[np.isnan(lvs)]) == 0
  
imports: import numpy
  import pandas
  import pyflux
label_desc: Use image node_id 22 for calling a global function with example usage: test2_exponential_couple_terms() without return types