From c1a4451032856f5262cf8d17e91f0e75d97698cd Mon Sep 17 00:00:00 2001
From: Yingbo Ma <mayingbo5@gmail.com>
Date: Sun, 12 Jan 2020 16:59:12 -0500
Subject: [PATCH] =?UTF-8?q?Fix=20asum=20for=20the=20case=20where=20=CE=94x?=
 =?UTF-8?q?=20is=20a=20matrix?=
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---
 src/rulesets/LinearAlgebra/blas.jl | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/src/rulesets/LinearAlgebra/blas.jl b/src/rulesets/LinearAlgebra/blas.jl
index bb0734e52..77940fbed 100644
--- a/src/rulesets/LinearAlgebra/blas.jl
+++ b/src/rulesets/LinearAlgebra/blas.jl
@@ -68,10 +68,7 @@ end
 #####
 
 function frule(::typeof(BLAS.asum), x, _, Δx)
-    return BLAS.asum(x), sum(zip(x, Δx)) do xs
-        x, Δx = xs
-        return sign(x) * Δx
-    end
+    return BLAS.asum(x), sum(sign.(x) .* Δx)
 end
 
 function rrule(::typeof(BLAS.asum), x)