UndefVarError: AutoZygote not defined

[rozsasarpi]

When running this:

using GalacticOptim: AutoZygote

I get the following error:

ERROR: UndefVarError: AutoZygote not defined
Stacktrace:
  [1] eval
    @ .\boot.jl:360 [inlined]
  [2] eval
    @ .\Base.jl:39 [inlined]
  [3] repleval(m::Module, code::Expr, #unused#::String)
    @ VSCodeServer c:\Users\arpada\.vscode\extensions\julialang.language-julia-1.3.33\scripts\packages\VSCodeServer\src\repl.jl:157
  [4] (::VSCodeServer.var"#69#71"{Module, Expr, REPL.LineEditREPL, REPL.LineEdit.Prompt})()
    @ VSCodeServer c:\Users\arpada\.vscode\extensions\julialang.language-julia-1.3.33\scripts\packages\VSCodeServer\src\repl.jl:123
  [5] with_logstate(f::Function, logstate::Any)
    @ Base.CoreLogging .\logging.jl:491
  [6] with_logger
    @ .\logging.jl:603 [inlined]
  [7] (::VSCodeServer.var"#68#70"{Module, Expr, REPL.LineEditREPL, REPL.LineEdit.Prompt})()
    @ VSCodeServer c:\Users\arpada\.vscode\extensions\julialang.language-julia-1.3.33\scripts\packages\VSCodeServer\src\repl.jl:124
  [8] #invokelatest#2
    @ .\essentials.jl:708 [inlined]
  [9] invokelatest(::Any)
    @ Base .\essentials.jl:706
 [10] macro expansion
    @ c:\Users\arpada\.vscode\extensions\julialang.language-julia-1.3.33\scripts\packages\VSCodeServer\src\eval.jl:34 [inlined]
 [11] (::VSCodeServer.var"#53#54")()
    @ VSCodeServer .\task.jl:411

Setup:

• Julia v1.6.2
• GalacticOptim v2.0.3
• Win 10 v1909

Additional info:

• Because a few months ago the same code was working without an error, I tried it with GalacticOptim v1.3.0 but got the same error.
• Tried it also in a new environment with only GalactiOptim (and its dependencies) but got the same error.
• using GalacticOptim: OptimizationFunction, OptimizationProblem, solve works without an issue.

Any hunch on what might be the problem?

[Vaibhavdixit02]

Do using Zygote before the above line and it should work fine, this happened because all AD backends have been moved behind @requires since v2 bump

[rozsasarpi]

Thanks a lot for the prompt reply and for the explanation! Having using Zygote before using GalacticOptim solved the issue.

[erlebach]

The documentation does mention that Zygote.jl is necessary, but does not mention that it is the user's responsibility to include in their package. Shouldn't that be explicitly added? Thanks.

[ChrisRackauckas]

It should be explicitly added to the docs. We should probably make a tutorial that's specifically about AD handling. @Vaibhavdixit02 let's chat about that.

[Vaibhavdixit02]

Sure, I am planning a blog post as well after DiffEqParamEstim changes land. But that might not be related, let's make it more explicit in the docs.

[ChrisRackauckas]

See SciML/SciMLDocs#108 tutorials vs examples. Optimization.jl needs a getting started tutorial to be fleshed out, and some of the current stuff needs to be moved to examples. And there needs to be a lot more docs on the minibatching stuff.