Overload Base.eps() for TrackedReal

src/layers/stateless.jl

@@ -25,8 +25,7 @@ Return `-y*log(ŷ + ϵ) - (1-y)*log(1-ŷ + ϵ)`. The ϵ term provides numerica
     0.352317
     0.86167
 """
-# binarycrossentropy(ŷ, y; ϵ=eps(Flux.Tracker.data(ŷ))) = -y*log(ŷ + ϵ) - (1 - y)*log(1 - ŷ + ϵ)
-binarycrossentropy(ŷ, y; ϵ=eps(Flux.Tracker.data(ŷ))) = -y*log(ŷ + ϵ) - (1 - y)*log(1 - ŷ + ϵ)
+binarycrossentropy(ŷ, y; ϵ=eps(ŷ)) = -y*log(ŷ + ϵ) - (1 - y)*log(1 - ŷ + ϵ)
 
 """
     logitbinarycrossentropy(logŷ, y)

src/tracker/scalar.jl

@@ -31,6 +31,8 @@ Base.convert(::Type{TrackedReal{T}}, x::TrackedReal{S}) where {T,S} =
 Base.:(<)(x::TrackedReal, y::TrackedReal) = data(x) < data(y)
 Base.:(==)(x::TrackedReal, y::TrackedReal) = data(x) == data(y)
 
+Base.eps(x::TrackedReal) = eps(data(x))
+
 for f in :[isinf, isnan, isfinite].args
   @eval Base.$f(x::TrackedReal) = Base.$f(data(x))
 end