code: def testCompose(self):
      x = registry.flatten(0)[1]
      y = registry.flatten((0, 0))[1]
      self.assertEqual((x.compose(y)).num_leaves, 2)
  
file_path: tensorflow-upstream/third_party/xla/xla/python/pytree_test.py
imports: import collections
  from absl.testing import absltest
  from xla.python import xla_client
label_desc: Use image node_id 7 for calling the PyTreeTest obj's underlying member method code with example usage: obj.testCompose() without return types