Add init keyword to sum and sum! rules - #870

[JuliaFormatter] reported by reviewdog 🐶 Raw Output: test/rulesets/Base/mapreduce.jl:105:- test_frule(sum, abs2, x; fkwargs=(;dims=dims, init=rand())) test/rulesets/Base/mapreduce.jl:106:- test_rrule(sum, abs2, x; fkwargs=(;dims=dims, init=rand())) test/rulesets/Base/mapreduce.jl:107:- @gpu frule((NoTangent(), NoTangent(), x), sum, abs2, x; dims=dims, init=rand(Float32)) test/rulesets/Base/mapreduce.jl:112:+ test_frule(sum, abs2, x; fkwargs=(; dims=dims, init=rand())) test/rulesets/Base/mapreduce.jl:113:+ test_rrule(sum, abs2, x; fkwargs=(; dims=dims, init=rand())) test/rulesets/Base/mapreduce.jl:114:+ @gpu frule( test/rulesets/Base/mapreduce.jl:115:+ (NoTangent(), NoTangent(), x), test/rulesets/Base/mapreduce.jl:116:+ sum, test/rulesets/Base/mapreduce.jl:117:+ abs2, test/rulesets/Base/mapreduce.jl:118:+ x; test/rulesets/Base/mapreduce.jl:119:+ dims=dims, test/rulesets/Base/mapreduce.jl:120:+ init=rand(Float32), test/rulesets/Base/mapreduce.jl:121:+ )

[JuliaFormatter] reported by reviewdog 🐶 Raw Output: test/rulesets/Base/mapreduce.jl:87:- @test frule((NoTangent(), ẏ, ones(2, 2)), sum!, y, [1.0 2.0; 3.0 4.0]; init=false) == test/rulesets/Base/mapreduce.jl:88:- ([13.0, 27.0], [3.0, 4.0]) test/rulesets/Base/mapreduce.jl:93:+ @test frule( test/rulesets/Base/mapreduce.jl:94:+ (NoTangent(), ẏ, ones(2, 2)), sum!, y, [1.0 2.0; 3.0 4.0]; init=false test/rulesets/Base/mapreduce.jl:95:+ ) == ([13.0, 27.0], [3.0, 4.0])

[JuliaFormatter] reported by reviewdog 🐶 Raw Output: test/rulesets/Base/mapreduce.jl:39:- test_frule(sum, rand(5); fkwargs=(;dims=dims, init=rand())) test/rulesets/Base/mapreduce.jl:40:- test_rrule(sum, rand(5); fkwargs=(;dims=dims, init=rand())) test/rulesets/Base/mapreduce.jl:39:+ test_frule(sum, rand(5); fkwargs=(; dims=dims, init=rand())) test/rulesets/Base/mapreduce.jl:40:+ test_rrule(sum, rand(5); fkwargs=(; dims=dims, init=rand()))

[JuliaFormatter] reported by reviewdog 🐶 Raw Output: src/rulesets/Base/mapreduce.jl:226:- ::$Config, ::typeof(sum), ::typeof(abs2), x::AbstractArray{T}; src/rulesets/Base/mapreduce.jl:227:- dims=:, init=_InitialValue(), src/rulesets/Base/mapreduce.jl:228:+ ::$Config, src/rulesets/Base/mapreduce.jl:229:+ ::typeof(sum), src/rulesets/Base/mapreduce.jl:230:+ ::typeof(abs2), src/rulesets/Base/mapreduce.jl:231:+ x::AbstractArray{T}; src/rulesets/Base/mapreduce.jl:232:+ dims=:, src/rulesets/Base/mapreduce.jl:233:+ init=_InitialValue(),

[JuliaFormatter] reported by reviewdog 🐶 Raw Output: src/rulesets/Base/mapreduce.jl:209:- y = init === _InitialValue() ? sum(abs2, x; dims=dims) : src/rulesets/Base/mapreduce.jl:209:+ y = if init === _InitialValue() src/rulesets/Base/mapreduce.jl:210:+ sum(abs2, x; dims=dims) src/rulesets/Base/mapreduce.jl:211:+ else

[JuliaFormatter] reported by reviewdog 🐶 Raw Output: src/rulesets/Base/mapreduce.jl:203:- ::typeof(sum), src/rulesets/Base/mapreduce.jl:204:- ::typeof(abs2), src/rulesets/Base/mapreduce.jl:205:- x::AbstractArray{T}; src/rulesets/Base/mapreduce.jl:206:- dims=:, src/rulesets/Base/mapreduce.jl:207:- init=_InitialValue(), src/rulesets/Base/mapreduce.jl:207:+ ::typeof(sum), ::typeof(abs2), x::AbstractArray{T}; dims=:, init=_InitialValue()

[JuliaFormatter] reported by reviewdog 🐶 Raw Output: src/rulesets/Base/mapreduce.jl:190:- y = init === _InitialValue() ? sum(abs2, x; dims=dims) : src/rulesets/Base/mapreduce.jl:191:+ y = if init === _InitialValue() src/rulesets/Base/mapreduce.jl:192:+ sum(abs2, x; dims=dims) src/rulesets/Base/mapreduce.jl:193:+ else

[JuliaFormatter] reported by reviewdog 🐶 Raw Output: src/rulesets/Base/mapreduce.jl:97:- dims = :, src/rulesets/Base/mapreduce.jl:98:- init = _InitialValue(), src/rulesets/Base/mapreduce.jl:98:+ dims=:, src/rulesets/Base/mapreduce.jl:99:+ init=_InitialValue(),

Input 'fail_on_error' has been deprecated with message: Deprecated, use `fail_level` instead.