code: def test_tree_replace_masked(self):
      data = jnp.array([[1, 2, 3, 4, 5, 6], [-1, -2, -3, -4, -5, -6]])
      tree_data = {"a": data, "b": data}
      replacement = data * 10
      tree_replacement = {"a": replacement, "b": replacement}
      mask = jnp.array([0, 1])
      tree_output = tree_util.tree_replace_masked(
          tree_data, tree_replacement, mask
      )
      expected_output = jnp.array(
          [
              [1, 2, 3, 4, 5, 6],
              [-10, -20, -30, -40, -50, -60],
          ]
      )
      expected_tree_output = {
          "a": expected_output,
          "b": expected_output,
      }
      # Test output.
      np.testing.assert_allclose(
          tree_output["a"], expected_tree_output["a"]
      )
      np.testing.assert_allclose(
          tree_output["b"], expected_tree_output["b"]
      )
  
file_path: rlax/rlax/_src/tree_util_test.py
imports: from absl.testing import absltest
  import chex
  import jax
  import jax.numpy
  import numpy
  from rlax._src import tree_util
label_desc: Use image node_id 10 for calling the TreeUtilTest obj's underlying member method code with example usage: obj.test_tree_replace_masked() without return types