Fix rrule for * and add support for constant operations#211
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Fix rrule for * and add support for constant operations#211
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Co-authored-by: Mitchell Harris <mitchell.harris@mit.edu>
blegat
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Dec 26, 2022
| #ΔΩ = ChainRulesCore.unthunk(Ω̇) | ||
| #return (ChainRulesCore.NoTangent(), ChainRulesCore.ProjectTo(p)(ΔΩ * q'), ChainRulesCore.ProjectTo(q)(p' * ΔΩ)) | ||
| return (ChainRulesCore.NoTangent(), ΔΩ̇ * q', p' * ΔΩ̇) | ||
| return (ChainRulesCore.NoTangent(), adjoint_mult_right(q, ΔΩ̇), adjoint_mult_left(p, ΔΩ̇)) |
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The previous definition was correct for the scalar product dot(p, q) = p * q, the current one is correct for the scalar product dot(p, q) = dot(coefficients(p), coefficients(q)) (assuming they have the same monomials).
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This second scalar product corresponds to the _dot we use for testing differentiate. This means that for differentiate we assume the other scalar product
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@oxinabox this is the issue I mentioned to you at JuliaCon |
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@sethaxen might have thoughts here |
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I am a bit unsure what to do here. I think we should define
rrulebased onLinearAlgebra.dotso we should remove the definition of the rule fordifferentiateand keep the old one for*.@harris-mit I would expect that the current rule for differentitation gives incorrect result when you use it with AD since it assumes a scalar product that is not what is used, does it work for you ?