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Description
We've come across a strange bug involving control flow:
julia> using FiniteDifferences
julia> using Zygote
julia> function f(x)
y = [[x]', [x]]
r = 0.0
o = 1.0
for n in 1:2
o *= y[n]
if n < 2
proj_o = o * [1.0]
else
# Error
proj_o = o
# Fix
# proj_o = o * 1.0
end
r += proj_o
end
return r
end
f (generic function with 1 method)
julia> x = 1.2
1.2
julia> f(x)
2.6399999999999997
julia> central_fdm(5, 1)(f, x)
3.4000000000000967
julia> f'(x)
ERROR: MethodError: no method matching +(::Float64, ::LinearAlgebra.Adjoint{Float64, Vector{Float64}})
For element-wise addition, use broadcasting with dot syntax: scalar .+ array
Closest candidates are:
+(::Any, ::Any, ::Any, ::Any...) at ~/software/julia-1.7.3/share/julia/base/operators.jl:655
+(::Union{Float16, Float32, Float64}, ::BigFloat) at ~/software/julia-1.7.3/share/julia/base/mpfr.jl:413
+(::ChainRulesCore.Tangent{P}, ::P) where P at ~/.julia/packages/ChainRulesCore/GUvJT/src/tangent_arithmetic.jl:146
...
Stacktrace:
[1] accum(x::Float64, y::LinearAlgebra.Adjoint{Float64, Vector{Float64}})
@ Zygote ~/.julia/packages/Zygote/DkIUK/src/lib/lib.jl:17
[2] Pullback
@ ./REPL[16]:15 [inlined]
[3] (::typeof(∂(f)))(Δ::Float64)
@ Zygote ~/.julia/packages/Zygote/DkIUK/src/compiler/interface2.jl:0
[4] (::Zygote.var"#52#53"{typeof(∂(f))})(Δ::Float64)
@ Zygote ~/.julia/packages/Zygote/DkIUK/src/compiler/interface.jl:41
[5] (::Zygote.var"#54#55"{typeof(f)})(x::Float64)
@ Zygote ~/.julia/packages/Zygote/DkIUK/src/compiler/interface.jl:83
[6] top-level scope
@ REPL[20]:1
Changing the line:
proj_o = o
to:
proj_o = o * 1.0
fixes the issue and outputs:
julia> f(x)
2.6399999999999997
julia> central_fdm(5, 1)(f, x)
3.4000000000000967
julia> f'(x)
3.4000000000000004
Version information:
julia> versioninfo()
Julia Version 1.7.3
Commit 742b9abb4d (2022-05-06 12:58 UTC)
Platform Info:
OS: Linux (x86_64-pc-linux-gnu)
CPU: Intel(R) Xeon(R) E-2176M CPU @ 2.70GHz
WORD_SIZE: 64
LIBM: libopenlibm
LLVM: libLLVM-12.0.1 (ORCJIT, skylake)
Environment:
JULIA_EDITOR = vim
julia> using Pkg
julia> Pkg.status("Zygote")
Status `~/.julia/environments/v1.7/Project.toml`
[e88e6eb3] Zygote v0.6.40
julia> Pkg.status("ChainRules")
Status `~/.julia/environments/v1.7/Project.toml`
[082447d4] ChainRules v1.35.1
Original issue is here: https://github.com/ITensor/ITensorMPS.jl/issues/73