code: def is_xpu_available():
      """check whether parl can access a XPU
  
      Returns:
        True if paddle was complied with XPU.
      """
      xpu_count = int(os.getenv("FLAGS_selected_xpus", "-1"))
      if xpu_count < 0:
          return False
  
      if _HAS_FLUID:
          from paddle import fluid
  
          if not fluid.is_compiled_with_xpu():
              logger.warning(
                  "Found non-empty XPU_VISIBLE_DEVICES. \
                  But PARL found that Paddle was not complied with XPU, which may cause issues. \
                  Thus PARL will not use XPU."
              )
              return False
      if _HAS_PADDLE:
          import paddle
  
          if not paddle.is_compiled_with_xpu():
              logger.warning(
                  "Found non-empty XPU_VISIBLE_DEVICES. \
                  But PARL found that Paddle was not complied with XPU, which may cause issues. \
                  Thus PARL will not use XPU."
              )
              return False
      return True
  
file_path: PARL/parl/utils/machine_info.py
imports: import os
  import platform
  import random
  import socket
  import subprocess
  from parl.utils import logger, _HAS_FLUID, _HAS_PADDLE, _IS_WINDOWS
label_desc: Use image node_id 4 for calling a global function with example usage: is_xpu_available() and returns: True, False, False, False