2016-08-25 16:26:07 +00:00
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export σ, relu, softmax
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2016-08-23 13:28:54 +00:00
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σ(x) = 1 ./ (1 .+ exp.(-x))
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2016-08-24 14:41:30 +00:00
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back!(::typeof(σ), Δ, x) = Δ .* σ(x)./(1.-σ(x))
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2016-08-25 16:26:07 +00:00
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relu(x) = max(0, x)
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back(::typeof(relu), Δ, x) = Δ .* (x .< 0)
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softmax(x) = error("not implemented")
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