Question about speed

hello,thank you for your excellent job,but I have a question,I have many images and I want to process them in a for loop,in this https://github.com/eldor4do/Tensorflow-Examples/blob/master/retraining-example.py link,It seems only process one image at a time,should I add a for loop into with tf.Seesion() as sess: statement.Is there any efficient way to run inference quickly?