class_docstr: Internal implementation of TimerService.
code: def advance_watermark(self, wm: int):
      self._internal.advance_watermark(wm)
  
imports: import collections
  import time
  from enum import Enum
  from io import BytesIO
  from pyflink.common import Row
  from pyflink.datastream import TimerService
  from pyflink.fn_execution.datastream.timerservice import InternalTimer, K, N, InternalTimerService
label_desc: Use image node_id 4 for calling the TimerServiceImpl obj's underlying member method code with example usage: obj.advance_watermark(wm) without return types