code: def test_bbvi_elbo():
      """
      Tests that the ELBO increases
      """
      """
      model = pf.GASLLT(data=data, family=pf.Normal())
      x = model.fit('BBVI',iterations=300, record_elbo=True, map_start=False)
      assert(x.elbo_records[-1]>x.elbo_records[0])
      """
  
imports: import numpy
  import pyflux
label_desc: Use image node_id 5 for calling a global function with example usage: test_bbvi_elbo() without return types