MethodError: vcat(::ReverseDiff.TrackedArray{Float32, Float32, 2, Matrix{Float32}, Matrix{Float32}}, ::Matrix{Float32}) is ambiguous.

[prbzrg]

Error:

  MethodError: vcat(::ReverseDiff.TrackedArray{Float32, Float32, 2, Matrix{Float32}, Matrix{Float32}}, ::Matrix{Float32}) is ambiguous.
  
  Candidates:
    vcat(x::ReverseDiff.TrackedArray{V, D, 2} where {V, D}, xs::AbstractMatrix...)
      @ ReverseDiff ~/.julia/packages/ReverseDiff/UJhiD/src/derivatives/arrays.jl:53
    vcat(X1::Union{Number, AbstractVecOrMat{<:Number}}, X::Union{Number, AbstractVecOrMat{<:Number}}...)
      @ SparseArrays /opt/hostedtoolcache/julia/1.10.0-rc1/x64/share/julia/stdlib/v1.10/SparseArrays/src/sparsevector.jl:1235
    vcat(x::ReverseDiff.TrackedArray{V, D, 2} where {V, D}, xs::AbstractVecOrMat...)
      @ ReverseDiff ~/.julia/packages/ReverseDiff/UJhiD/src/derivatives/arrays.jl:53
  
  Possible fix, define
    vcat(::ReverseDiff.TrackedArray{V, D, 2} where {V, D}, ::Vararg{AbstractMatrix{<:Number}})

Ref:
https://github.com/impICNF/ContinuousNormalizingFlows.jl/actions/runs/6837454027/job/18593483086#step:5:21513

[prbzrg]

Reported in JuliaDiff/ReverseDiff.jl#242

[prbzrg]

Related to JuliaLang/julia#52263 and JuliaSparse/SparseArrays.jl#431

[prbzrg]

New error:

  Test threw exception
  Expression: !(isnothing(ReverseDiff.gradient(diff2_loss, r)))
  MethodError: vcat(::ReverseDiff.TrackedArray{Float32, Float32, 2, Matrix{Float32}, Matrix{Float32}}, ::Matrix{ReverseDiff.TrackedReal{Float32, Float32, ReverseDiff.TrackedArray{Float32, Float32, 2, Matrix{Float32}, Matrix{Float32}}}}) is ambiguous.
  
  Candidates:
    vcat(x::ReverseDiff.TrackedArray{V, D, 2} where {V, D}, xs::AbstractMatrix...)
      @ ReverseDiff ~/.julia/packages/ReverseDiff/UJhiD/src/derivatives/arrays.jl:53
    vcat(X1::Union{Number, AbstractVecOrMat{<:Number}}, X::Union{Number, AbstractVecOrMat{<:Number}}...)
      @ SparseArrays /opt/hostedtoolcache/julia/1.10.0/x64/share/julia/stdlib/v1.10/SparseArrays/src/sparsevector.jl:1235
    vcat(x::ReverseDiff.TrackedArray{V, D, 2} where {V, D}, xs::AbstractVecOrMat...)
      @ ReverseDiff ~/.julia/packages/ReverseDiff/UJhiD/src/derivatives/arrays.jl:53
  
  Possible fix, define
    vcat(::ReverseDiff.TrackedArray{V, D, 2} where {V, D}, ::Vararg{AbstractMatrix{<:Number}})