code: def test_exponential_predict_is_length():
      """
      Tests that the prediction IS dataframe length is equal to the number of steps h
      """
      model = pf.GAS(
          data=exponentialdata, ar=2, sc=2, family=pf.Exponential()
      )
      x = model.fit()
      assert model.predict_is(h=5).shape[0] == 5
  
imports: import numpy
  import pyflux
label_desc: Use image node_id 12 for calling a global function with example usage: test_exponential_predict_is_length() without return types