Comments (2)
Assuming you mean Zygote, its broadcasting at present prefers to use ForwardDiff internally, if possible. Thus it will not see rules defined using either Zygote itself, or using anything from ChainRules.
What you can do it write a rule for broadcasted(f, x)
, e.g. https://github.com/FluxML/NNlib.jl/blob/master/src/activations.jl#L880 or https://github.com/JuliaDiff/ChainRules.jl/pull/586/files#diff-69fb16cdd94960c65024f9dfe644deae5023a2af02d68f26c0855cf538d2ca0aR53 . If, like these, your rule returns broadcast(f, x)
then it will un-fuse the broadcasting. Which at present Zygote also does.
This is not well documented, unfortunately. Partly because it's not so clear what the best strategy is. @scalar_rule
now defines also derivatives_using_output
which should be useful for handling broadcasting.
from chainrulescore.jl.
This is basically a zygote issue which is not actionable further here, so I am closing this for now.
from chainrulescore.jl.
Related Issues (20)
- Document how to define own ProjectTo's
- Document how to construct Wirtinger derivative
- Making `getproperty`, `getindex` and `iterate` more type stable for `Tangent`s HOT 1
- Make ZeroTangent() == 0 HOT 3
- Using the gradient function from Flux / Zygote with a custom rrule HOT 5
- Cannot generate `frule` seed via `one(x)` HOT 1
- overload iszero for Tangent
- `ProjectTo(::AbstractSparseMatrix{Bool})` should be trivial
- No method matching `(::ChainRulesCore.ProjectTo)(::Tuple{Float64})` HOT 9
- ProjectTo causes scalar indexing when taking adjoints of complex CuArray HOT 1
- FAQ Broken Links HOT 3
- (to be deleted)
- Get rid of `MethodError: no method matching iterate(::Nothing)` HOT 1
- tangent_type(primal_type)
- typos in geometric descriptions in the docs HOT 3
- `norm(NoTangent())` causes StackOverflow HOT 8
- support substraction on Tangent{T} HOT 2
- `tangent * tangent` and `dot(tangent, tangent)` can return tangents.
- ChainRulesCore.ProjectTo creates sparse matrices of the wrong element type (drops Duals) HOT 3
- using ChainRulesCore changes type promotion logic HOT 1
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from chainrulescore.jl.