code: def register_pytree(
      pytree_type: type,
      flatten_fn: FlattenFn,
      unflatten_fn: UnflattenFn,
  ):
      """Register a type with all available pytree backends.
  
      Current backends is jax.
      Args:
          pytree_type (type): the type to register, such as ``qml.RX``
          flatten_fn (Callable): a function that splits an object into trainable leaves and hashable metadata.
          unflatten_fn (Callable): a function that reconstructs an object from its leaves and metadata.
  
      Returns:
          None
  
      Side Effects:
          ``pytree`` type becomes registered with available backends.
  
      """
  
      if has_jax:
          _register_pytree_with_jax(
              pytree_type, flatten_fn, unflatten_fn
          )
  
label_desc: Use image node_id 2 for calling a global function with example usage: register_pytree(pytree_type, flatten_fn, unflatten_fn) without return types