code: def test_init_returns_empty_weights_and_state(self):
      layer = tl.Layer()
      input_signature = shapes.ShapeDtype((2, 5))
      weights, state = layer.init(input_signature)
      self.assertEmpty(weights)
      self.assertEmpty(state)
  
imports: from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  from trax import fastmath
  from trax import shapes
  from trax.fastmath import numpy
  import trax.layers
label_desc: Use image node_id 4 for calling the BaseLayerTest obj's underlying member method code with example usage: obj.test_init_returns_empty_weights_and_state() without return types