code: def test_batch_concat(self):
      batch_size = 32
      inputs = [
          jnp.zeros(shape=(batch_size, 2)),
          {"foo": jnp.zeros(shape=(batch_size, 5, 3))},
          [jnp.zeros(shape=(batch_size, 1))],
          jnp.zeros(shape=(batch_size,)),
      ]
  
      output_shape = utils.batch_concat(inputs).shape
      expected_shape = [batch_size, 2 + 5 * 3 + 1 + 1]
      self.assertSequenceEqual(output_shape, expected_shape)
  
file_path: acme/acme/jax/utils_test.py
imports: from acme.jax import utils
  import chex
  import jax
  import jax.numpy
  import numpy
  from absl.testing import absltest
label_desc: Use image node_id 1 for calling the JaxUtilsTest obj's underlying member method code with example usage: obj.test_batch_concat() without return types