Unsupported keyword arguments for LinearMaps.WrappedMap

[VHarisop]

I have the following code snippet that tries to calculate the gradient of the following expression:

$$ x \mapsto \langle \mathbf{vec}(x x^{\mathsf{T}}), c \rangle = \langle x \otimes x, c \rangle, $$

where $\otimes$ denotes the Kronecker product and $c$ is an appropriately-sized vector. I was using the following snippet of code:

import LinearAlgebra: kron
import LinearMaps: LinearMap
import Zygote: gradient, Params

function kronprod(x::AbstractVector{Float64}, c::AbstractVector{Float64})
  x_map = LinearMap(x)
  return sum(kron(x_map, x_map)' * c)
end

x = rand(16);
c = rand(16 * 16);

g = gradient(Params([x])) do
  kronprod(x, c)
end

@show g

Upon executing it, I receive the following error message:

ERROR: LoadError: MethodError: no method matching (LinearMaps.WrappedMap{Float64})(::Vector{Float64}; issymmetric::Bool, ishermitian::Bool, isposdef::Bool)
This error has been manually thrown, explicitly, so the method may exist but be intentionally marked as unimplemented.

Closest candidates are:
  (LinearMaps.WrappedMap{T})(::AbstractVector; issym, isherm, ispd) where T got unsupported keyword arguments "issymmetric", "ishermitian", "isposdef"
   @ LinearMaps ~/.julia/packages/LinearMaps/GRDXH/src/wrappedmap.jl:13
  (LinearMaps.WrappedMap{T})(::Union{AbstractMatrix{T}, LinearAlgebra.AbstractQ{T}, LinearMap{T}} where T; issymmetric, ishermitian, isposdef) where T
   @ LinearMaps ~/.julia/packages/LinearMaps/GRDXH/src/wrappedmap.jl:7

The first candidate method includes keyword arguments issym, isherm, ispd instead of issymmetric, ishermitian, etc. A quick search reveals that they are only used in WrappedMap. Is this intentional?

[dkarrasch]

No intention, just nonsense. The fix should be released in max 2 hours. Thanks for reporting!

[VHarisop]

Thank you for the quick fix!

[dkarrasch]

It's released now.