code: def test_sine_shape(self):
      inputs = data.sine_inputs(batch_size=3, length=5)
      train_batch = next(inputs.train_stream(n_devices=1))
      eval_batch = next(inputs.eval_stream(n_devices=1))
      # (observations, actions, observations, mask)
      self.assertLen(train_batch, 4)
      self.assertLen(eval_batch, 4)
      for x, y in zip(train_batch, eval_batch):
          self.assertEqual(x.shape, (3, 5))
          self.assertEqual(y.shape, (3, 5))
  
imports: import itertools
  import os
  from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  from trax import data
label_desc: Use image node_id 41 for calling the InputsTest obj's underlying member method code with example usage: obj.test_sine_shape() without return types