first Github project Changing files of branch to see difference. $ cd tensorflow/models/image/mnist $ python convolutional.py Successfully downloaded train-images-idx3-ubyte.gz 9912422 bytes. Successfully downloaded train-labels-idx1-ubyte.gz 28881 bytes. Successfully downloaded t10k-images-idx3-ubyte.gz 1648877 bytes. Successfully downloaded t10k-labels-idx1-ubyte.gz 4542 bytes. Extracting data/train-images-idx3-ubyte.gz Extracting data/train-labels-idx1-ubyte.gz Extracting data/t10k-images-idx3-ubyte.gz Extracting data/t10k-labels-idx1-ubyte.gz Initialized! Step 0 (epoch 0.00), 9.3 ms Minibatch loss: 12.054, learning rate: 0.010000 Minibatch error: 90.6% Validation error: 84.6% Step 100 (epoch 0.12), 826.7 ms Minibatch loss: 3.289, learning rate: 0.010000 Minibatch error: 6.2% Validation error: 7.0%