Skip to content

finite_difference_gradient is mutating arrays #148

Open
@YichengDWu

Description

@YichengDWu
julia> function f(x,p)
           grad = FiniteDiff.finite_difference_gradient(y -> sum(y.^3), x)
           return grad .* p
       end
f (generic function with 1 method)

julia> x,p = rand(3),rand(3);

julia> Zygote.gradient(p->sum(f(x,p)), p)[1]
ERROR: Mutating arrays is not supported -- called setindex!(Vector{Float64}, ...)
This error occurs when you ask Zygote to differentiate operations that change
the elements of arrays in place (e.g. setting values with x .= ...)

Possible fixes:
- avoid mutating operations (preferred)
- or read the documentation and solutions for this error
  https://fluxml.ai/Zygote.jl/dev/limitations.html#Array-mutation-1

Stacktrace:
  [1] error(s::String)
    @ Base .\error.jl:33
  [2] _throw_mutation_error(f::Function, args::Vector{Float64})
    @ Zygote C:\Users\Luffy\.julia\packages\Zygote\IoW2g\src\lib\array.jl:70
  [3] (::Zygote.var"#444#445"{Vector{Float64}})(#unused#::Nothing)
    @ Zygote C:\Users\Luffy\.julia\packages\Zygote\IoW2g\src\lib\array.jl:82
  [4] (::Zygote.var"#2496#back#446"{Zygote.var"#444#445"{Vector{Float64}}})(Δ::Nothing)
    @ Zygote C:\Users\Luffy\.julia\packages\ZygoteRules\AIbCs\src\adjoint.jl:67
  [5] Pullback
    @ C:\Users\Luffy\.julia\packages\FiniteDiff\KkXlb\src\gradients.jl:277 [inlined]
  [6] (::typeof((#finite_difference_gradient!#16)))(Δ::Vector{Float64})
    @ Zygote C:\Users\Luffy\.julia\packages\Zygote\IoW2g\src\compiler\interface2.jl:0
  [7] Pullback
    @ C:\Users\Luffy\.julia\packages\FiniteDiff\KkXlb\src\gradients.jl:224 [inlined]
  [8] (::typeof((finite_difference_gradient!##kw)))(Δ::Vector{Float64})
    @ Zygote C:\Users\Luffy\.julia\packages\Zygote\IoW2g\src\compiler\interface2.jl:0
  [9] Pullback
    @ C:\Users\Luffy\.julia\packages\FiniteDiff\KkXlb\src\gradients.jl:88 [inlined]
 [10] (::typeof((#finite_difference_gradient#12)))(Δ::Vector{Float64})
    @ Zygote C:\Users\Luffy\.julia\packages\Zygote\IoW2g\src\compiler\interface2.jl:0
 [11] Pullback
    @ C:\Users\Luffy\.julia\packages\FiniteDiff\KkXlb\src\gradients.jl:70 [inlined]
 [12] (::typeof((finite_difference_gradient)))(Δ::Vector{Float64})
    @ Zygote C:\Users\Luffy\.julia\packages\Zygote\IoW2g\src\compiler\interface2.jl:0
 [13] Pullback
    @ C:\Users\Luffy\.julia\packages\FiniteDiff\KkXlb\src\gradients.jl:70 [inlined]
 [14] (::typeof((finite_difference_gradient)))(Δ::Vector{Float64})
    @ Zygote C:\Users\Luffy\.julia\packages\Zygote\IoW2g\src\compiler\interface2.jl:0
 [15] Pullback
    @ .\REPL[94]:2 [inlined]
 [16] (::typeof((f)))(Δ::FillArrays.Fill{Float64, 1, Tuple{Base.OneTo{Int64}}})
    @ Zygote C:\Users\Luffy\.julia\packages\Zygote\IoW2g\src\compiler\interface2.jl:0
 [17] Pullback
    @ .\REPL[95]:1 [inlined]
 [18] (::typeof((#30)))(Δ::Float64)
    @ Zygote C:\Users\Luffy\.julia\packages\Zygote\IoW2g\src\compiler\interface2.jl:0
 [19] (::Zygote.var"#60#61"{typeof((#30))})(Δ::Float64)
    @ Zygote C:\Users\Luffy\.julia\packages\Zygote\IoW2g\src\compiler\interface.jl:41
 [20] gradient(f::Function, args::Vector{Float64})
    @ Zygote C:\Users\Luffy\.julia\packages\Zygote\IoW2g\src\compiler\interface.jl:76
 [21] top-level scope
    @ REPL[95]:1
 [22] top-level scope
    @ C:\Users\Luffy\.julia\packages\CUDA\DfvRa\src\initialization.jl:52

Metadata

Metadata

Assignees

No one assigned

    Labels

    No labels
    No labels

    Type

    No type

    Projects

    No projects

    Milestone

    No milestone

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions