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Performance issues in read_input.py(P2) #15

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@DLPerf

Hello,I found a performance issue in the definition of get_dataset_iterator ,
read_input.py,
dataset = dataset.map(read_image) was called without num_parallel_calls.
I think it will increase the efficiency of your program if you add this.

Here is the documemtation of tensorflow to support this thing.

Looking forward to your reply. Btw, I am very glad to create a PR to fix it if you are too busy.

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