code: def device_memory_profile(backend: str | None = None) -> bytes:
      """Captures a JAX device memory profile as ``pprof``-format protocol buffer.
  
      A device memory profile is a snapshot of the state of memory, that describes the JAX
      :class:`~jax.Array` and executable objects present in memory and their
      allocation sites.
  
      For more information how to use the device memory profiler, see
      :doc:`/device_memory_profiling`.
  
      The profiling system works by instrumenting JAX on-device allocations,
      capturing a Python stack trace for each allocation. The instrumentation is
      always enabled; :func:`device_memory_profile` provides an API to capture it.
  
      The output of :func:`device_memory_profile` is a binary protocol buffer that
      can be interpreted and visualized by the `pprof tool
      <https://github.com/google/pprof>`_.
  
      Args:
        backend: optional; the name of the JAX backend for which the device memory
          profile should be collected.
  
      Returns:
        A byte string containing a binary `pprof`-format protocol buffer.
      """
      return xla_client.heap_profile(xla_bridge.get_backend(backend))
  
imports: from __future__ import annotations
  from contextlib import contextmanager
  from functools import wraps
  import glob
  import gzip
  import http.server
  import json
  import logging
  import os
  import socketserver
  import threading
  from typing import Callable
  from jax._src import traceback_util
  from jax._src import xla_bridge
  from jax._src.lib import xla_client
label_desc: Use image node_id 10 for calling a global function with example usage: device_memory_profile(backend) and returns: xla_client