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port batchnorm rrule from Flux #499

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Jun 16, 2023
Merged

port batchnorm rrule from Flux #499

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10 changes: 10 additions & 0 deletions src/normalization.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -2,3 +2,13 @@
function batchnorm end

function ∇batchnorm end


function ChainRulesCore.rrule(::typeof(batchnorm), g, b, x, running_mean, running_var, momentum; kw...)
y = batchnorm(g, b, x, running_mean, running_var, momentum; kw...)
function batchnorm_pullback(Δ)
grad = ∇batchnorm(g, b, x, unthunk(Δ), running_mean, running_var, momentum; kw...)
(NoTangent(), grad..., NoTangent(), NoTangent(), NoTangent())
end
y, batchnorm_pullback
end