batchindex, batch and batchseq

[Proyag]

Even the examples in the documentation don't work for these functions.

julia> Flux.batch([[1,2,3],[4,5,6]])
ERROR: UndefVarError: indices not defined
Stacktrace:
 [1] batchindex(::Array{Int64,2}, ::Int64) at /home/ppal/.julia/packages/Flux/uUcYO/src/utils.jl:27
 [2] batch(::Array{Array{Int64,1},1}) at /home/ppal/.julia/packages/Flux/uUcYO/src/utils.jl:71
 [3] top-level scope at none:0

Changing indices to axes in the batchindex function fixed this,
but after that

julia> Flux.batchseq([[1,2,3],[4,5]], 0)
ERROR: MethodError: no method matching Array{Int64,1}(::Int64)
Closest candidates are:
  Array{Int64,1}() where T at boot.jl:413
  Array{Int64,1}(::UndefInitializer, ::Int64) where T at boot.jl:394
  Array{Int64,1}(::UndefInitializer, ::Int64...) where {T, N} at boot.jl:400
  ...
Stacktrace:
 [1] batch(::Array{Int64,1}) at /home/ppal/.julia/packages/Flux/uUcYO/src/utils.jl:67
 [2] (::getfield(Flux, Symbol("##4#7")){Array{Array{Int64,1},1}})(::Int64) at ./none:0
 [3] iterate at ./generator.jl:47 [inlined]
 [4] collect at ./array.jl:619 [inlined]
 [5] batchseq at /home/ppal/.julia/packages/Flux/uUcYO/src/utils.jl:94 [inlined]
 [6] batchseq(::Array{Array{Int64,1},1}, ::Int64) at /home/ppal/.julia/packages/Flux/uUcYO/src/utils.jl:93
 [7] top-level scope at none:0

[Proyag]

Related to #368 but unlike that one, I'm not getting any errors with batch after fixing the indices to axes.

[MikeInnes]

Guess these got lost in the transition to 1.0. Would you be able to send a PR for the fixes you have?

For batchseq you probably just need to use Array{Int}(undef, N).

[Proyag]

Thanks for the pointer. Hope #389 helps.