how to count the time spent on each network layer in the GPU mode

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how to count the time spent on each network layer in the GPU mode

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how to count the time spent on each network layer in the GPU mode?I find it cost much more time in GPU mode than in CPU mode,so I want to find which layer cost the most time in my model.

I have used the API "GetPerformanceCounts", but when in GPU mode it throw the exception "Performance counters were not enabled".

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