code: def test_rnn():
      cell_types = [
          (gluon.rnn.RNNCell, 1),
          (gluon.rnn.LSTMCell, 2),
          (gluon.rnn.GRUCell, 1),
      ]
      for cell_type, num_states in cell_types:
          check_rnn(cell_type, num_states)
  
imports: import copy
  import numpy
  import mxnet
  from mxnet import gluon
  from mxnet.test_utils import *
  from mxnet.base import _as_list
  from collections import defaultdict
  from mxnet.attribute import AttrScope
label_desc: Use image node_id 11 for calling a global function with example usage: test_rnn() without return types