code: def initialize():
      path = _get_library_path()
      if path is None:
          return
  
      # TODO(b/300099402): use the util method when it is ready.
      options = {}
      visible_devices = xb.CUDA_VISIBLE_DEVICES.value
      if visible_devices != "all":
          options["visible_devices"] = [
              int(x) for x in visible_devices.split(",")
          ]
  
      allocator = os.getenv(
          "XLA_PYTHON_CLIENT_ALLOCATOR", "default"
      ).lower()
      memory_fraction = os.getenv("XLA_PYTHON_CLIENT_MEM_FRACTION", "")
      preallocate = os.getenv(
          "XLA_PYTHON_CLIENT_PREALLOCATE", ""
      ).lower()
      if allocator not in ("default", "platform", "bfc", "cuda_async"):
          raise ValueError(
              'XLA_PYTHON_CLIENT_ALLOCATOR env var must be "default", "platform", '
              '"bfc", or "cuda_async", got "%s"' % allocator
          )
      options["allocator"] = allocator
      if memory_fraction:
          options["memory_fraction"] = float(memory_fraction)
      if preallocate:
          options["preallocate"] = preallocate not in ("false", "0")
      c_api = xb.register_plugin(
          "cuda", priority=500, library_path=str(path), options=options
      )
      if cuda_plugin_extension:
          xla_client.register_custom_call_handler(
              "CUDA",
              functools.partial(
                  cuda_plugin_extension.register_custom_call_target,
                  c_api,
              ),
          )
          for (
              _name,
              _value,
          ) in cuda_plugin_extension.registrations().items():
              xla_client.register_custom_call_target(
                  _name, _value, platform="CUDA"
              )
      else:
          logger.warning("cuda_plugin_extension is not found.")
  
file_path: jax/jax_plugins/cuda/__init__.py
imports: import functools
  import importlib
  import logging
  import os
  import pathlib
  import platform
  import sys
  from jax._src.lib import xla_client
  import jax._src.xla_bridge
label_desc: Use image node_id 2 for calling a global function with example usage: initialize() without return types