Flux.jl/README.md

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Flux is a library for machine learning, implemented in Julia. Flux is high-level yet extremely lightweight, providing only simple abstractions on top of Julia's native GPU support and automatic differentiation.

Define a simple model using any Julia code:

using Flux.Tracker
x, y = rand(10), rand(5) # Dummy input / output
# `track` defines parameters that we can train
W, b = track(randn(5,10)), track(randn(5))
# Transform `x` and calculate the mean squared error
loss = Flux.mse(W*x .+ b, y)
# Calculate and store gradients of `track`ed parameters
back!(loss)
Tracker.grad(W) # Get the gradient of `W` wrt the loss

Define a larger model using high-level abstractions:

using Flux

m = Chain(
  Dense(10, 32, relu),
  Dense(32, 10), softmax)

m(rand(10))

Mix and match the two:

using Flux.Tracker
x, y = rand(10), rand(5)
d = Dense(10, 5)
loss = Flux.mse(d(x), y)

See the documentation or the model zoo for more examples.