code: def start(self):
      flat_args, tree = tree_util.tree_flatten(
          (
              self.src_ref,
              self.src_indexers,
              self.dst_ref,
              self.dst_indexers,
              self.dst_sem,
              self.dst_sem_indexers,
              self.src_sem,
              self.src_sem_indexers,
              self.device_id,
          )
      )
      dma_start_p.bind(
          *flat_args, tree=tree, device_id_type=self.device_id_type
      )
  
imports: from __future__ import annotations
  import contextlib
  import dataclasses
  import enum
  from typing import Any, Callable
  import jax
  from jax._src import api_util
  from jax._src import core
  from jax._src import effects
  from jax._src import linear_util
  from jax._src import pretty_printer
  from jax._src import state
  from jax._src import tree_util
  from jax._src import util
  from jax._src.state import indexing
  from jax._src.state import primitives
  from jax._src.interpreters import mlir
  from jax._src.interpreters import partial_eval
  from jax._src.pallas.mosaic import core
  import jax.numpy
label_desc: Use image node_id 3 for calling the AsyncCopyDescriptor obj's underlying member method code with example usage: obj.start() without return types