{ stdenvNoCC, fetchurl }: let srcs = { train-images = fetchurl { url = "http://yann.lecun.com/exdb/mnist/train-images-idx3-ubyte.gz"; sha256 = "029na81z5a1c9l1a8472dgshami6f2iixs3m2ji6ym6cffzwl3s4"; }; train-labels = fetchurl { url = "http://yann.lecun.com/exdb/mnist/train-labels-idx1-ubyte.gz"; sha256 = "0p152200wwx0w65sqb65grb3v8ncjp230aykmvbbx2sm19556lim"; }; test-images = fetchurl { url = "http://yann.lecun.com/exdb/mnist/t10k-images-idx3-ubyte.gz"; sha256 = "1rn4vfigaxn2ms24bf4jwzzflgp3hvz0gksvb8j7j70w19xjqhld"; }; test-labels = fetchurl { url = "http://yann.lecun.com/exdb/mnist/t10k-labels-idx1-ubyte.gz"; sha256 = "1imf0i194ndjxzxdx87zlgn728xx3p1qhq1ssbmnvv005vwn1bpp"; }; }; in stdenvNoCC.mkDerivation rec { pname = "mnist"; version = "2018-11-16"; installPhase = '' mkdir -p $out ln -s "${srcs.train-images}" "$out/${srcs.train-images.name}" ln -s "${srcs.train-labels}" "$out/${srcs.train-labels.name}" ln -s "${srcs.test-images}" "$out/${srcs.test-images.name}" ln -s "${srcs.test-labels}" "$out/${srcs.test-labels.name}" ''; phases = [ "installPhase" ]; meta = with stdenvNoCC.lib; { description = "A large database of handwritten digits"; longDescription = '' The MNIST database (Modified National Institute of Standards and Technology database) is a large database of handwritten digits that is commonly used for training various image processing systems. ''; homepage = http://yann.lecun.com/exdb/mnist/index.html; license = licenses.cc-by-sa-30; platforms = platforms.all; maintainers = with maintainers; [ cmcdragonkai ]; }; }