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Add an error for [I array] #811

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Add an error for [I array] #811

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145250b
Update array.jl
mcabbott Oct 16, 2024
ba0800c
Update Project.toml
mcabbott Oct 16, 2024
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5 changes: 5 additions & 0 deletions src/rulesets/Base/array.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -220,6 +220,11 @@ end
# All the [hv]cat functions treat anything that's not an array as a scalar.
_catsize(x) = ()
_catsize(x::AbstractArray) = size(x)
_catsize(::LinearAlgebra.UniformScaling) = error(
"""ChainRules does not at present support *cat functions with LinearAlgebra.I
as it does not know how to calculate the size occupied in e.g. `[1:4 I 5:8]`.
Writing instead `[1:4 I(4) 5:8]` should work.
Issue tracking this is here: https://github.com/JuliaDiff/ChainRules.jl/issues/810""")

function rrule(::typeof(hcat), Xs...)
Y = hcat(Xs...) # note that Y always has 1-based indexing, even if X isa OffsetArray
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