fix std usage

src/Flux.jl

@@ -4,7 +4,7 @@ module Flux
 
 # Zero Flux Given
 
-using Juno, Requires, Reexport
+using Juno, Requires, Reexport, StatsBase
 using MacroTools: @forward
 
 export Chain, Dense, RNN, LSTM, GRU, Conv,

src/tracker/array.jl

@@ -233,10 +233,12 @@ dot(xs::TrackedVector, ys::AbstractVector) = track(dot, xs, ys)
 
 @grad dot(xs, ys) = dot(data(xs), data(ys)), Δ -> (Δ .* ys, Δ .* xs)
 
+using StatsBase
+
 # Hacks to get std working
-Base.std(x::TrackedArray; mean = Base.mean(x)) =
+StatsBase.std(x::TrackedArray; mean = Base.mean(x)) =
   sqrt.(sum((x .- mean).^2) ./ (length(x)-1))
-Base.std(x::TrackedArray, dim; mean = Base.mean(x, dim)) =
+StatsBase.std(x::TrackedArray, dim; mean = Base.mean(x, dim)) =
   sqrt.(sum((x .- mean).^2, dim) ./ (size(x, dim)-1))
 
 LinearAlgebra.vecnorm(x::TrackedArray, p::Real = 2) =

test/tracker.jl

@@ -1,6 +1,7 @@
 using Flux.Tracker, Base.Test, NNlib
 using Flux.Tracker: TrackedReal, gradcheck, grad, derivative, checkpoint
 using NNlib: conv
+using StatsBase
 
 gradtest(f, xs::AbstractArray...) = gradcheck((xs...) -> sum(sin.(f(xs...))), xs...)
 gradtest(f, dims...) = gradtest(f, rand.(dims)...)

test/utils.jl

@@ -1,4 +1,5 @@
 using Flux: throttle, initn, glorot_uniform, glorot_normal, jacobian
+using StatsBase: std
 
 @testset "Throttle" begin
   @testset "default behaviour" begin