Making the code work with the newer Flux syntax

docs/src/ML/ml.md

@@ -3,32 +3,29 @@
 [From the model zoo](https://github.com/FluxML/model-zoo/blob/master/mnist/mnist.jl)
 
 ```Julia
-using Flux, MNIST, CuArrays
-using Flux: onehotbatch, argmax, mse, throttle
+using Flux, MLDatasets, CuArrays
+using Flux: onehotbatch, argmax, crossentropy, throttle, onecold
 using Base.Iterators: repeated
 
-x, y = traindata()
-y = onehotbatch(y, 0:9)
+x, y = x, y = MNIST.traindata()
+x = reshape(x,28*28,:) |> gpu
+y = onehotbatch(y, 0:9) |> gpu
 
 m = Chain(
     Dense(28^2, 32, σ),
     Dense(32, 10),
     softmax
-)
+) |> gpu
 
-using CuArrays
-# or CLArrays (you then need to use cl
 
-x, y = cu(x), cu(y)
-m = mapparams(cu, m)
-loss(x, y) = mse(m(x), y)
+loss(x, y) = crossentropy(m(x), y)
 
 dataset = repeated((x, y), 500)
 evalcb = () -> @show(loss(x, y))
-opt = SGD(params(m), 1)
+opt = Descent()
 
-Flux.train!(loss, dataset, opt, cb = throttle(evalcb, 10))
+Flux.train!(loss, params(m), dataset, opt, cb = throttle(evalcb, 10))
 
 # Check the prediction for the first digit
-argmax(m(x[:,1]), 0:9) == argmax(y[:,1], 0:9)
+onecold(m(x[:,1]), 0:9) == onecold(y[:,1], 0:9)
 ```