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April 25, 2020 03:20
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using AutoGrad, CuArrays, Knet, Test | |
using AutoGrad: @gcheck | |
using CuArrays: @cufunc | |
const GConstant01 = sqrt(2/pi) | |
const GConstant02 = 0.044715 * sqrt(2/pi) | |
const GConstant03 = GConstant01 / 2 | |
# Main definition, broadcasted version works on Arrays | |
gelu(x::T) where T = (x/2)*(1 + tanh(T(GConstant02)*x^3 + T(GConstant01)*x)) | |
geluback(x::T,dy::T) where T = dy*(T(0.5)*tanh(T(GConstant02)*x^3 + T(GConstant01)*x) + (T(0.0535161)*x^3 + T(GConstant03)*x)*(1/cosh(T(GConstant02)*x^3 + T(GConstant01)*x))^2 + T(0.5)) | |
# This defines gelu for AutoGrad | |
@primitive gelu(x),dy geluback.(x,dy) | |
# This makes broadcasted gelu work for CuArray, directly compiling a CUDA kernel from Julia code. | |
# @cufunc necessary to use a GPU compatible version of tanh etc. | |
# https://github.com/JuliaGPU/CuArrays.jl/issues/253 | |
@cufunc gelu(x::T) where T = (x/2)*(1 + tanh(T(GConstant02)*x^3 + T(GConstant01)*x)) | |
@cufunc geluback(x::T,dy::T) where T = dy*(T(0.5)*tanh(T(GConstant02)*x^3 + T(GConstant01)*x) + (T(0.0535161)*x^3 + T(GConstant03)*x)*(1/cosh(T(GConstant02)*x^3 + T(GConstant01)*x))^2 + T(0.5)) | |
# This defines gelu for KnetArray | |
import Base.Broadcast: broadcasted | |
import Knet: KnetArray | |
function KnetArray(x::CuArray{T,N}) where {T,N} | |
p = Base.bitcast(Knet.Cptr, x.ptr) | |
k = Knet.KnetPtr(p, sizeof(x), gpu(), x) | |
KnetArray{T,N}(k, size(x)) | |
end | |
broadcasted(::typeof(gelu),x::KnetArray) = KnetArray(gelu.(CuArray(x))) | |
broadcasted(::typeof(geluback),x::KnetArray,dy::KnetArray) = KnetArray(geluback.(CuArray(x),CuArray(dy))) | |
# This tests all of the above | |
@testset "gelu" begin | |
x = rand(10) | |
a = Param(x) | |
c = Param(CuArray(x)) | |
k = Param(KnetArray(x)) | |
@test @gcheck gelu.(a) | |
@test @gcheck gelu.(c) | |
@test @gcheck gelu.(k) | |
end |
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