code: def test_simple_call(self):
      layer = sparsity.LocallyConnectedDense(2, 8)
      x = np.array([[2, 5, 3, 4], [0, 1, 2, 3]])
      _, _ = layer.init(shapes.signature(x))
  
      y = layer(x)
      self.assertEqual(y.shape, (2, 16))
  
imports: import functools
  from absl.testing import parameterized
  import jax
  import numpy
  from tensorflow import test
  from trax import fastmath
  from trax import shapes
  import trax.layers
  from trax.layers import test_utils
  from trax.layers.research import sparsity
label_desc: Use image node_id 1 for calling the LocallyConnectedDenseTest obj's underlying member method code with example usage: obj.test_simple_call() without return types