class_docstr: Timer.
class_docstr_tok: ["Timer","."]
docstr: Start the timer.
docstr_tok: ["Start","the","timer","."]
code: def start(self):
      """Start the timer."""
      assert not self.started_, "timer has already been started"
      torch.cuda.synchronize()
      self.start_time = time.time()
      self.started_ = True
  
file_path: apex/apex/transformer/pipeline_parallel/_timers.py
imports: import time
  import torch
label_desc: Use image node_id 2 for calling the _Timer obj's underlying member method code with example usage: obj.start() without return types