Just some clarification iteration versus epoch. In digits, 1 epoch is a full run through all the test material once. Digits hits some good accuracy after 25 epoch on average. What is the measure of iterations? Is it also 1 full traversal through the training image list? I have 34k images to train on and if the iterations was based on 1 image test, this would explain my current 50/50 split dilemma for the results after 30k iteration.