code: def test_t_bbvi_elbo():
      """
      Tests that the ELBO increases
      """
      model = pf.GAS(data=data, ar=1, sc=1, family=pf.t())
      x = model.fit("BBVI", iterations=100, record_elbo=True)
      assert x.elbo_records[-1] > x.elbo_records[0]
  
imports: import numpy
  import pyflux
label_desc: Use image node_id 6 for calling a global function with example usage: test_t_bbvi_elbo() without return types