class_docstr: Computes the sum/avg duration of some event in seconds
class_docstr_tok: ["Computes","the","sum\/avg","duration","of","some","event","in","seconds"]
code: def elapsed_time(self):
      if self.start_time is None:
          return 0.0
      return time.perf_counter() - self.start_time
  
imports: import bisect
  import time
  from collections import OrderedDict
  from typing import Dict, Optional
label_desc: Use image node_id 8 for calling the StopwatchMeter obj's underlying member method code with example usage: obj.elapsed_time() and returns: unknown, int