code: def get_peak_mem():
      """Get the peak memory size.
  
      Returns
      -------
      float
          The peak memory size in GB.
      """
      if not os.path.exists("/proc/self/status"):
          return 0.0
      for line in open("/proc/self/status", "r"):
          if "VmPeak" in line:
              mem = re.findall(r"\d+", line)[0]
              return int(mem) / 1024 / 1024
      return 0.0
  
imports: import os
  import re
  import time
  import numpy
  from .None import backend, utils
  from ._ffi.function import _init_api
  from .base import EID, ETYPE, NID, NTYPE
  from .heterograph import DGLGraph
  from .ndarray import NDArray
  from .subgraph import edge_subgraph
label_desc: Use image node_id 5 for calling a global function with example usage: get_peak_mem() and returns: int, int, unknown