bug描述 Describe the Bug

https://www.paddlepaddle.org.cn/documentation/docs/en/develop/api/paddle/profiler/Profiler_en.html

中例子1、2、的p.step()执行。第一次可以有log文件，第二次就报错：

AttributeError Traceback (most recent call last)
/tmp/ipykernel_168/153734649.py in
8 #train()
----> 9 p.step()

/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/profiler/profiler.py in step(self, num_samples)
575 self.current_state = self.scheduler(self.step_num)
--> 576 self._trigger_action()
577 self.record_event = RecordEvent(

/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/profiler/profiler.py in _trigger_action(self)
631 if self.current_state == ProfilerState.READY: # CLOSED -> READY
--> 632 self.profiler.prepare()
633 if self.current_state == ProfilerState.RECORD: # CLOSED -> RECORD

AttributeError: 'NoneType' object has no attribute 'prepare'

During handling of the above exception, another exception occurred:

AttributeError Traceback (most recent call last)
/tmp/ipykernel_168/153734649.py in
7 for iter in range(10):
8 #train()
----> 9 p.step()

/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/profiler/profiler.py inexit(self, exc_type, exc_val, exc_tb)
455
456 defexit(self, exc_type, exc_val, exc_tb):
--> 457 self.stop()
458
459 def start(self):

/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/profiler/profiler.py in stop(self)
531 "Inproper Profiler state transform: READY->CLOSED, profiler will start and stop without saving data"
532 )
--> 533 self.profiler.start()
534 self.profiler.stop()
535 if self.current_state == ProfilerState.RECORD or self.current_state == ProfilerState.RECORD_AND_RETURN:

AttributeError: 'NoneType' object has no attribute 'start'

其他补充信息 Additional Supplementary Information

• No response*