t10k-images-idx3-ubyte
t10k-labels-idx1-ubyte
train-images-idx3-ubyte
train-labels-idx1-ubyte
test-images-idx3-ubyte
test-labels-idx1-ubyte

a.out

train/
test/

train_img_list.txt
test_img_list.txt

# 所有目录下的build子目录中的任何目录，都忽略
**/build/*/