Performance issue in the definition of one_hot_encode_image_op, model/utils.py(P1)

[DLPerf]

Hello, I found a performance issue in the definition of one_hot_encode_image_op, model/utils.py, tf.zeros will be called repeatedly during program execution, resulting in reduced efficiency. I think it should be created before the loop.

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

[lreiher]

Hi, feel free to propose a PR. :) Would also be interesting to see whether this yields a performance improvement.

[lreiher]

Closing due to inactivity.