Support input dataset prefetch in distributed trainer. #766
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luomai
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zsdonghao
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Aug 1, 2018
luomai
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luomai
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Nov 21, 2018
* add prefetch to distributed trainer. * update changelog * yapf
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Checklist
Motivation and Context
When the data preparation is heavy, we observe low GPU utilisation as the GPU is waiting for the CPU to finish data pre-processing. Enabling dataset prefetch can overlap CPU pre-processing and GPU training.
Description
The dataset prefetch is useful when the data preparation step is heavy.