code: def test_tree_size(self, shape, dtype, container):
      x = np.ones(shape, dtype=dtype)
      expected_size = np.prod(x.shape) if x.ndim else 1
      self.assertEqual(utils.tree_size(container(x)), expected_size)
  
imports: from absl.testing import absltest
  from absl.testing import parameterized
  from haiku._src import test_utils
  from haiku._src import utils
  import jax.numpy
  import numpy
label_desc: Use image node_id 3 for calling the UtilsTest obj's underlying member method code with example usage: obj.test_tree_size(shape, dtype, container) without return types