fix: fix issue

Author: hack-hard

src/batchs.jl

@@ -22,7 +22,7 @@ function ConcatenatedBatch((; field)::Batch)
     ConcatenatedBatch(cat(field; dims=ndims(field)), vcat([0], field .|> size .|> last |> cumsum))
 end
 function stack_ConcatenatedBatch(x::AbstractVector{<:ConcatenatedBatch})
-	field = Folds.mapreduce((a,b) ->cat(a, b; dims=ndims(a)), x) do a 
+	field = mapreduce((a,b) ->cat(a, b; dims=ndims(a)), x) do a 
 		a.field
     end
     offsets = vcat([0], getfield.(x, :lengths) .|> last)::Vector{Int} |> cumsum |> DropLast(1)