Thanks for you reply, but now i have some question about the fields that displayed by profiler, since they are different from the python document.
{
  "name": "size",
  "ph": "X",
  "ts": 236152.000000,
  "dur": 1.000000,
  "tid": 0,
  "pid": "CPU Functions",
  "args": {}
},

What’s the meaning of ph, ts, dur and tid, and how should i explain their value?