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merge cumprod rules to fix ambig on julia 1.6 #784

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merge cumprod rules to fix ambig on julia 1.6 #784

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16a604d
merge cumprod rules
oxinabox Feb 9, 2024
a1a70cc
Make default dims=1
oxinabox Feb 9, 2024
b1d7b46
make sure we still error if the primal code errored
oxinabox Feb 9, 2024
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43 changes: 14 additions & 29 deletions src/rulesets/Base/mapreduce.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -325,52 +325,37 @@ end
##### `cumprod`
#####

function rrule(::typeof(cumprod), x::AbstractVector{<:Real}; dims::Integer=1)
y = cumprod(x; dims=dims) # does nothing unless dims == 1
project_x = ProjectTo(x)
function cumprod_pullback_1(dy_raw)
dy = unthunk(dy_raw)
dx_thunk = InplaceableThunk(
dx -> if dims == 1
∇cumprod!(dx, x, dy, y)
else
dx .+= dy
end
,
@thunk project_x(if dims == 1
∇cumprod(x, dy, y)
else
dy
end)
)
return (NoTangent(), dx_thunk)
end
return y, cumprod_pullback_1
end

function rrule(::typeof(cumprod), x::AbstractArray{<:Real}; dims::Integer)
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y = cumprod(x; dims=dims)
project_x = ProjectTo(x)
function cumprod_pullback_2(dy_raw)
function cumprod_pullback(dy_raw)
dy = unthunk(dy_raw)
dx_thunk = InplaceableThunk(
dx -> if dims <= ndims(x)
vald = Val(Int(dims))
∇cumprod_dim!(dx, vald, x, dy, y)
if ndims(x) == 1
∇cumprod!(dx, x, dy, y)
else
vald = Val(Int(dims))
∇cumprod_dim!(dx, vald, x, dy, y)
end
else
dx .+= dy
end
,
@thunk project_x(if dims <= ndims(x)
vald = Val(Int(dims))
∇cumprod_dim(vald, x, dy, y)
if ndims(x) == 1
∇cumprod(x, dy, y)
else
vald = Val(Int(dims))
∇cumprod_dim(vald, x, dy, y)
end
else
dy
end)
Comment on lines 349 to 360
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[JuliaFormatter] reported by reviewdog 🐶

Suggested change
end
,
@thunk project_x(if dims <= ndims(x)
vald = Val(Int(dims))
∇cumprod_dim(vald, x, dy, y)
if ndims(x) == 1
∇cumprod(x, dy, y)
else
vald = Val(Int(dims))
∇cumprod_dim(vald, x, dy, y)
end
else
dy
end)
end,
@thunk project_x(
if dims <= ndims(x)
if ndims(x) == 1
∇cumprod(x, dy, y)
else
vald = Val(Int(dims))
∇cumprod_dim(vald, x, dy, y)
end
else
dy
end,

)
return (NoTangent(), dx_thunk)
end
return y, cumprod_pullback_2
return y, cumprod_pullback
end

function ∇cumprod_dim(vald::Val{dim}, x::AbstractArray, dy=fill!(zero(x),1), y=cumprod(x; dims=dim)) where {dim}
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