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Comments (2)

mcabbott avatar mcabbott commented on September 25, 2024

The rule for cross being used is here:

ChainRules.jl/src/rulesets/LinearAlgebra/dense.jl

Lines 103 to 114 in f13e0a4

function rrule(::typeof(cross), a::AbstractVector{<:Real}, b::AbstractVector{<:Real})
project_a = ProjectTo(a)
project_b = ProjectTo(b)
Ω = cross(a, b)
function cross_pullback(Ω̄)
ΔΩ = unthunk(Ω̄)
da = @thunk(project_a(cross(b, ΔΩ)))
db = @thunk(project_b(cross(ΔΩ, a)))
return (NoTangent(), da, db)
end
return Ω, cross_pullback
end

Things like jacobian(cross, rand(3), rand(3))[1] work fine.

I think the problem is the splat, ..., which is #599

from chainrules.jl.

benjaminfaber avatar benjaminfaber commented on September 25, 2024

Thank you, that appears to be the problem. I can use norm instead hypot and that works.

from chainrules.jl.

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