code: def testFromConfigLSTM(self):
      l1 = dynamic_unroll_layer.DynamicUnroll(
          tf.keras.layers.LSTMCell(units=3), parallel_iterations=10
      )
      l2 = dynamic_unroll_layer.DynamicUnroll.from_config(
          l1.get_config()
      )
      self.assertEqual(l1.get_config(), l2.get_config())
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  import numpy
  import tensorflow
  from tf_agents.keras_layers import dynamic_unroll_layer
label_desc: Use image node_id 1 for calling the DynamicUnrollTest obj's underlying member method code with example usage: obj.testFromConfigLSTM() without return types