class_docstr: Total system disk write in MB.
class_docstr_tok: ["Total","system","disk","write","in","MB","."]
code: def sample(self) -> None:
      if self.write_init is None:
          # init on first sample
          self.write_init = psutil.disk_io_counters().write_bytes
      self.samples.append(
          (psutil.disk_io_counters().write_bytes - self.write_init)
          / 1024
          / 1024
      )
  
imports: import threading
  from collections import deque
  from typing import TYPE_CHECKING, List, Optional
  from wandb.errors.term import termwarn
  from .aggregators import aggregate_mean
  from .asset_registry import asset_registry
  from .interfaces import Interface, Metric, MetricsMonitor
label_desc: Use image node_id 2 for calling the DiskOut obj's underlying member method code with example usage: obj.sample() without return types