code: def test_fails_if_layers_empty(self):
      sequential = nn.Sequential([])
      with self.assertRaisesRegex(
          ValueError, "Empty Sequential module"
      ):
          sequential.init(random.key(42), jnp.ones((3, 5)))
  
imports: from typing import Any, Optional, Sequence
  import jax
  import numpy
  from absl.testing import absltest
  from jax import numpy
  from jax import random
  from flax import linen
label_desc: Use image node_id 2 for calling the SequentialTest obj's underlying member method code with example usage: obj.test_fails_if_layers_empty() without return types