class_docstr: A timer class that supports multiple named timers.
  A named timer can be used multiple times, in which case the average
  dt will be returned.
  A named timer cannot be started if it is already currently running.
  Use case: measuring execution of multiple code blocks.
docstr: Return list of all active named timers
docstr_tok: ["Return","list","of","all","active","named","timers"]
code: def active_timers(self):
      """
      Return list of all active named timers
      """
      return [k for k, v in self.timers.items() if ("start" in v)]
  
file_path: NeMo/nemo/utils/timers.py
imports: import time
  import numpy
  import torch
label_desc: Use image node_id 9 for calling the NamedTimer obj's underlying member method code with example usage: obj.active_timers() and returns: unknown