code: def a_test_sample_model():
      """
      Tests sampling function
      """
      model = ARIMA(data=data, ar=2, ma=2, family=Exponential())
      x = model.fit("BBVI", iterations=100)
      sample = model.sample(nsims=100)
      assert sample.shape[0] == 100
      assert sample.shape[1] == len(data) - 2
  
imports: import numpy
  from pyflux.arma import ARIMA
  from pyflux.families import Exponential
label_desc: Use image node_id 22 for calling a global function with example usage: a_test_sample_model() without return types