这篇写的不错，简单记录一下如何使用。
from tensorflow.python.client import timeline
#Run the graph with full trace optionwith tf.Session() as sess:
run_options= tf.RunOptions(trace_level=tf.RunOptions.FULL_TRACE)
run_metadata=tf.RunMetadata()
sess.run(res, options=run_options, run_metadata=run_metadata)
#Create the Timeline object, and write it to a json
tl =timeline.Timeline(run_metadata.step_stats)
ctf=tl.generate_chrome_trace_format()
with open('timeline.json','w') as f:
f.write(ctf)
