Performance issue in /train.py (by P3)

[DLPerf]

Hello! I've found a performance issue in /train.py: dataset.batch(batch)(here) shoule be called before dataset.map(map_func=parse_data)(here), which could make your program more efficient.

Here is the tensorflow document to support it.

Besides, you need to check the function parse_data called in dataset.map(map_func=parse_data) whether to be affected or not to make the changed code work properly. For example, if parse_data needs data with shape (x, y, z) as its input before fix, it would require data with shape (batch_size, x, y, z) after fix.

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

[DLPerf]

Hello, I'm looking forward to your reply~

[mmdd1314]

Hello, how should you solve the problem you mentioned? Looking forward to your sharing.😄