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Empty array input will throw error #417

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Empty array input will throw error #417

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4 changes: 3 additions & 1 deletion src/gather.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,8 @@ or multiple `dst` columns.
See [`gather`](@ref) for an allocating version.
"""
function gather!(dst::AbstractArray, src::AbstractArray, idx::AbstractArray)
isempty(dst) && throw(ArgumentError("dst does not support empty array of size $(size(dst))."))
isempty(src) && throw(ArgumentError("src does not support empty array of size $(size(src))."))
dims = scatter_dims(src, dst, idx)
colons = ntuple(i -> Colon(), dims)
for k in CartesianIndices(idx)
Expand Down Expand Up @@ -70,7 +72,7 @@ julia> NNlib.gather([1 2 3; 4 5 6], [1,3,1,3,1])
function gather(src::AbstractArray{Tsrc, Nsrc},
idx::AbstractArray{Tidx, Nidx}) where
{Tsrc, Nsrc, Nidx, Tidx}

isempty(src) && throw(ArgumentError("src does not support empty array of size $(size(src))."))
M = typelength(Tidx)
dstsize = (size(src)[1:Nsrc-M]..., size(idx)...)
dst = similar(src, Tsrc, dstsize)
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3 changes: 3 additions & 0 deletions test/gather.jl
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Expand Up @@ -18,6 +18,8 @@ using NNlib: gather, gather!
@test y == output
@test gather!(T.(zero(index)), src, index) == output
@test_throws ArgumentError gather!(zeros(T, 3, 5), src, index)
@test_throws ArgumentError gather!(zeros(T, 0, 5), src, index)
@test_throws ArgumentError gather!(T.(zero(index)), zeros(T, 0, 5), index)

index2 = [1 2 3 4;
4 2 1 3;
Expand All @@ -37,6 +39,7 @@ using NNlib: gather, gather!
@test y isa Array{T,3}
@test size(y) == size(index)
@test y == output
@test_throws ArgumentError gather(zeros(T, 0, 5), index)


## 2d src, 2d index of ints -> 3d output
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