code: def test2_exponential_pml():
      """
      Tests an GASX model estimated with PML, with multiple predictors, and
      tests that the latent variable vector length is correct, and that value are not nan
      """
      model = pf.GASX(
          formula="y ~ x1 + x2",
          data=data,
          ar=1,
          sc=1,
          family=pf.Exponential(),
      )
      x = model.fit("PML")
      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 26 for calling a global function with example usage: test2_exponential_pml() without return types