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Expose profiler to Python. #7577

@qingqing01

Description

@qingqing01
  • Add profiler in the executor to record time for each op.
  • Expose profiler to Python.
  • The output is as follows in the unit test
------------------------->     Profiling Report <-------------------------

Place: CPU
Time unit: ms
Sorted by total time in descending order in the same thread

Event                            Calls       Total       Min.        Max.        Ave.
thread0::mul_grad                24          3.9817      0.030622    2.19622     0.165904
thread0::mul                     24          2.43597     0.018009    0.257821    0.101499
thread0::momentum                48          1.65413     0.012138    0.128806    0.0344611
thread0::softmax                 8           1.04434     0.129704    0.131114    0.130543
thread0::elementwise_add_grad    24          0.427291    0.01508     0.023408    0.0178038
thread0::elementwise_add         24          0.35214     0.009682    0.020287    0.0146725
thread0::cast                    32          0.286981    0.006007    0.0149      0.00896816
thread0::relu_grad               16          0.268582    0.013828    0.02076     0.0167864
thread0::top_k                   8           0.251921    0.02915     0.036       0.0314901
thread0::softmax_grad            8           0.196288    0.024375    0.024798    0.024536
thread0::sum                     16          0.172279    0.009126    0.012375    0.0107674
thread0::feed                    16          0.1705      0.00402     0.017667    0.0106562
thread0::relu                    16          0.132929    0.007018    0.009637    0.00830806
thread0::accuracy                8           0.116111    0.01412     0.015031    0.0145139
thread0::cross_entropy_grad      8           0.106584    0.012811    0.014423    0.013323
thread0::cross_entropy           8           0.096511    0.011705    0.012282    0.0120639
thread0::elementwise_div         8           0.089527    0.010935    0.01219     0.0111909
thread0::mean_grad               8           0.079708    0.008923    0.015726    0.0099635
thread0::fetch                   24          0.067049    0.001737    0.003392    0.00279371
thread0::mean                    8           0.05091     0.006111    0.006513    0.00636375
thread0::fill_constant           8           0.038575    0.004709    0.004976    0.00482187

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