Working on a nested optimization problem, I noticed that a lot of time was being spent in gradient calls, and a little digging found that doing out-of-place gradients was introducing a type-instability. I followed the advice here , but it does not appear to have helped…see MWE below: using ForwardD…

Type instability in ForwardDiff.gradient

ElOceanografo September 30, 2021, 3:57pm 3

No, unfortunately I tried that already and it doesn’t change anything…

Topic		Replies	Views
Jacobian of StaticArray function becoming type-unstable Performance	3	664	December 28, 2018
Type stability for higher derivatives in ForwardDiff General Usage forwarddiff , type-stability	2	485	August 19, 2021
Type stability, deprecation Performance	4	826	November 8, 2017
Type stable code with autodiff General Usage	2	136	July 29, 2023
Type unstable gradients in Zygote (@code_warntype) Machine Learning zygote , code_warntype , type-stability , autodiff	5	428	December 12, 2023