simplify sum rrule (#239)

* simplify sum rrule * bump version
JuliaDiff · Jul 16, 2020 · e9aa66e · e9aa66e · willtebbutt · Jul 16, 2020
1 parent 9a364d6
commit e9aa66e
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diff --git a/Project.toml b/Project.toml
@@ -1,6 +1,6 @@
 name = "ChainRules"
 uuid = "082447d4-558c-5d27-93f4-14fc19e9eca2"
-version = "0.7.9"
+version = "0.7.10"
 
 [deps]
 ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"

diff --git a/src/rulesets/Base/mapreduce.jl b/src/rulesets/Base/mapreduce.jl
@@ -7,7 +7,7 @@ function frule((_, ẋ), ::typeof(sum), x; dims=:)
 end
 
 function rrule(::typeof(sum), x::AbstractArray{T}; dims=:) where {T<:Number}
-    y = sum(sum, x; dims=dims)
+    y = sum(x; dims=dims)
     function sum_pullback(ȳ)
         # broadcasting the two works out the size no-matter `dims`
         x̄ = broadcast(x, ȳ) do xi, ȳi