class_docstr: Triggers on every fixed interval.
  
  Note that as long as the >= `interval` number of steps have passed since the
  last trigger, the event gets triggered. The current value is not necessarily
  `interval` steps away from the last triggered value.
code: def set_start(self, start: int) -> None:
      self._last_trigger_value = start
  
imports: from typing import Callable
  from absl import logging
label_desc: Use image node_id 4 for calling the IntervalTrigger obj's underlying member method code with example usage: obj.set_start(start) without return types