code: def _disk_stats(self):
      stats = {}
      cur_disk = _timed_disk_io_counters()
      if self._last_disk:
          for dev_name, last, cur in _zip_physical_disk_stats(
              self._last_disk, cur_disk
          ):
              for stat_name, val in _calc_disk_stats(last, cur).items():
                  stats[_dev_stat_key(dev_name, stat_name)] = val
      self._last_disk = cur_disk
      return stats
  
file_path: guildai/guild/plugins/disk.py
imports: import os
  import platform
  import re
  import sys
  import time
  from guild.plugins.summary_util import SummaryPlugin
label_desc: Use image node_id 4 for calling the DiskPlugin obj's underlying member method code with example usage: obj._disk_stats() and returns: stats