TastyPancakes/Flux.jl
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fix broadcasting

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This commit is contained in:
Mike J Innes 2018-07-12 19:28:30 +01:00
parent e486c50610
commit adc216f182
1 changed files with 14 additions and 11 deletions
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25
src/tracker/array.jl
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@ -327,6 +327,9 @@ end
using ForwardDiff: Dual, partials, value
_size(x::AbstractArray) = size(x)
_size(x) = ()
dualify(xs, n) = xs
dualify(xs::AbstractArray, ps) = map(x -> Dual(x, ps), xs)
dualify(xs::Real, ps) = Dual(xs, ps)
@ -343,7 +346,7 @@ function getpartial(Δ, x, i)
end
function ∇broadcast(f, args::Vararg{Any,N}) where N
sizes = size.(args)
sizes = _size.(args)
dargs = map((x,i) -> dualify(data(x), ntuple(j -> i==j, Val{N})), args, ntuple(identity, Val{N}))
out = broadcast(f, dargs...)
eltype(out) <: Dual || return out
@ -358,14 +361,14 @@ function ∇broadcast(f, args::Vararg{Any,N}) where N
track(Call(back, tracker.(args)), y)
end
Base.Broadcast._containertype(::Type{<:TrackedReal}) = TrackedArray
Base.Broadcast._containertype(::Type{<:TrackedArray}) = TrackedArray
Base.Broadcast.promote_containertype(::Type{TrackedArray}, ::Type{TrackedArray}) = TrackedArray
Base.Broadcast.promote_containertype(::Type{Array}, ::Type{TrackedArray}) = TrackedArray
Base.Broadcast.promote_containertype(::Type{TrackedArray}, ::Type{Array}) = TrackedArray
Base.Broadcast.promote_containertype(::Type{TrackedArray}, ct) = TrackedArray
Base.Broadcast.promote_containertype(ct, ::Type{TrackedArray}) = TrackedArray
Base.Broadcast.broadcast_indices(::Type{TrackedArray}, A::Ref) = ()
Base.Broadcast.broadcast_indices(::Type{TrackedArray}, A) = indices(A)
using Base.Broadcast: BroadcastStyle
Base.Broadcast.broadcast_c(f, ::Type{TrackedArray}, A, Bs...) = ∇broadcast(f, A, Bs...)
struct TrackedStyle <: BroadcastStyle end
Broadcast.BroadcastStyle(::Type{<:Union{TrackedArray,TrackedReal}}) = TrackedStyle()
Broadcast.BroadcastStyle(::TrackedStyle, ::BroadcastStyle) = TrackedStyle()
function Base.copy(bc::Broadcast.Broadcasted{TrackedStyle})
bc = Broadcast.flatten(bc)
∇broadcast(bc.f, bc.args...)
end