code: def a_test_bbvi_elbo():
      """
      Tests that the ELBO increases
      """
      model = ARIMA(data=data, ar=1, ma=0, family=Exponential())
      x = model.fit(
          "BBVI", iterations=200, record_elbo=True, map_start=False
      )
      assert x.elbo_records[-1] > x.elbo_records[0]
  
imports: import numpy
  from pyflux.arma import ARIMA
  from pyflux.families import Exponential
label_desc: Use image node_id 5 for calling a global function with example usage: a_test_bbvi_elbo() without return types