code: def test_weights_and_state_signature(self):
      class MyLayer(tl.Layer):
          def init_weights_and_state(self, input_signature):
              self.weights = jnp.zeros((2, 3))
              self.state = jnp.ones(input_signature.shape)
  
          def forward(self, inputs):
              return self.weights + self.state
  
      layer = MyLayer()
      w, s = layer.weights_and_state_signature(jnp.zeros((3, 4)))
      self.assertEqual(w.shape, (2, 3))
      self.assertEqual(s.shape, (3, 4))
  
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 8 for calling the BaseLayerTest obj's underlying member method code with example usage: obj.test_weights_and_state_signature() and returns: unknown