"https://github.com/golbin/TensorFlow-MNIST/raw/master/mnist/data/t10k-images-idx3-ubyte.gz"
"https://github.com/golbin/TensorFlow-MNIST/raw/master/mnist/data/t10k-labels-idx1-ubyte.gz"
}
- [ [ download-once ] parallel-each ]
+ [ [ download-once-into ] parallel-each ]
[ [ dup file-stem file-exists? [ drop ] [ file-name gzip-decompress-file ] if ] each ]
[ [ file-stem binary file-contents ] map ] tri
first4 {