code: def test_rse_forward_shape(self):
      vocab_size = 12
      seq_len = 32
      model = rse.ResidualShuffleExchange(
          vocab_size=vocab_size,
          d_model=17,
          dropout=0.1,
          input_dropout=0.05,
          mode="train",
      )
      x = np.ones((3, seq_len)).astype(np.int32)
      _, _ = model.init(shapes.signature(x))
      y = model(x)
      self.assertEqual(y.shape, (3, seq_len, vocab_size))
  
file_path: trax/trax/models/research/rse_test.py
imports: from absl.testing import absltest
  import numpy
  from trax import shapes
  from trax.models.research import rse
label_desc: Use image node_id 6 for calling the RSETest obj's underlying member method code with example usage: obj.test_rse_forward_shape() without return types