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Add hand written gelu derivative #480

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merged 6 commits into from
Mar 4, 2023
Merged

Add hand written gelu derivative #480

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da1f09c
make BatchedAdjOrTrans return correct BroadcastStyle
chengchingwen Jun 25, 2022
895ad6e
Merge remote-tracking branch 'upstream/master'
chengchingwen Dec 23, 2022
489d903
Merge branch 'FluxML:master' into master
chengchingwen Mar 2, 2023
aaebcd7
add gelu deriv
chengchingwen Mar 2, 2023
857a07e
refine
chengchingwen Mar 2, 2023
ebc6442
use muladd
chengchingwen Mar 3, 2023
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11 changes: 10 additions & 1 deletion src/activations.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -339,6 +339,15 @@ end
const gelu_λ = √(2 / π)
const gelu_2λ = √(8 / π)

function deriv_gelu(x)
α = oftf(x, 0.044715)
λλ = oftf(x, gelu_2λ)
x2 = x * x
t = muladd(x2, α, one(x))
Ω = sigmoid_fast(λλ * x * t)
return Ω + x * conj(Ω * (1 - Ω)) * λλ * (t + 2α * x2)
end

"""
swish(x) = x * σ(x)

Expand Down Expand Up @@ -853,7 +862,7 @@ UNARY_ACTS = [ # f, dfdx
(:relu6, :((Ω>0) & (Ω<6))),
# rrelu is random, can't write a rule.
(:elu, :(deriv_elu(Ω))),
# gelu
(:gelu, :(deriv_gelu(x))),
(:swish, :(Ω + sigmoid_fast(x) * (1 - Ω))),
(:hardswish, :(deriv_hardswish(x))),
# lisht
Expand Down