Batched inference

[voglinio]

Thank you for you great work and ideas. I would like to try this repo on my own satellite images. However since I don't get good utilization by passing images one by one in inference.py I decided to inference by batches. Initially I added one dimension to the image placeholder:

img_plac = tf.placeholder(shape=[None, None, 3], dtype=tf.uint8

Can you please guide me through this process because I am not familiar with tensorflow semantics