code: def a_test2_laplace():
      """
      Tests an ARIMAX model estimated with Laplace, with multiple predictors, and
      tests that the latent variable vector length is correct, and that value are not nan
      """
      model = ARIMAX(
          formula="y ~ x1 + x2",
          data=data,
          ar=1,
          ma=1,
          family=Exponential(),
      )
      x = model.fit("Laplace")
      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
  from pyflux.arma import ARIMAX
  from pyflux.families import Exponential
label_desc: Use image node_id 31 for calling a global function with example usage: a_test2_laplace() without return types