vcat(Matrix, Matrix, TrackedMatrix)

[improbable-22]

If I attempt to concatenate more than two matrices, not all of them tracked, then I get an error:

using Flux
vcat(rand(2,2), rand(2,2), rand(2,2) |> param)

I see there’s a PR #194 but have not yet managed to see if this version solves the problem.

Here's the complete error message:

julia> vcat(rand(2,2), rand(2,2), rand(2,2) |> param)

ERROR: MethodError: Cannot `convert` an object of type Flux.Tracker.TrackedReal{Float64} to an object of type Float64
This may have arisen from a call to the constructor Float64(...),
since type constructors fall back to convert methods.
Stacktrace:
 [1] macro expansion at ./multidimensional.jl:505 [inlined]
 [2] macro expansion at ./cartesian.jl:64 [inlined]
 [3] macro expansion at ./multidimensional.jl:503 [inlined]
 [4] _unsafe_setindex!(::IndexLinear, ::Array{Float64,2}, ::TrackedArray{…,Array{Float64,2}}, ::UnitRange{Int64}, ::Base.Slice{Base.OneTo{Int64}}) at ./multidimensional.jl:496
 [5] macro expansion at ./multidimensional.jl:488 [inlined]
 [6] _setindex! at ./multidimensional.jl:484 [inlined]
 [7] setindex!(::Array{Float64,2}, ::TrackedArray{…,Array{Float64,2}}, ::UnitRange{Int64}, ::Colon) at ./abstractarray.jl:967
 [8] typed_vcat(::Type{Float64}, ::Array{Float64,2}, ::Array{Float64,2}, ::TrackedArray{…,Array{Float64,2}}, ::Vararg{TrackedArray{…,Array{Float64,2}},N} where N) at ./abstractarray.jl:1148
 [9] vcat(::Array{Float64,2}, ::Array{Float64,2}, ::TrackedArray{…,Array{Float64,2}}) at ./abstractarray.jl:1132

julia> Pkg.status("Flux")
 - Flux                          0.5.1

[MikeInnes]

Merged with #243 -- thanks 👍