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gradient of maximum is not correct #53

@Roger-luo

Description

@Roger-luo

This is causing test broken in Zygote

fdm = central_fdm(5, 3)
Random.seed!(0);
M = rand(2, 3);
tmp = similar(M);

fdm(0.0) do ϵ
           tmp .= M
           tmp[1] += ϵ
           return maximum(tmp)
end
43.35451497451203

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