[Diff since v2.0.0](https://github.com/SciML/DiffEqFlux.jl/compare/v2.0.0...v2.1.0) **Closed issues:** - MethodError when running with NeuralODE with custom Lux layer (#825) - Running NODEs on GPU while keeping them Float64? (#826) - UODE with neural networks. Beginner questions (#831) - Scalar indexing when running UDE on GPU (#832) **Merged pull requests:** - Update tests for Float32 (#824) (@ChrisRackauckas) - OptimizationFlux (#828) (@anandijain) - Updates to HNN (#829) (@avik-pal) - Migrate GPU tests to Lux (and Fix them!!) (#830) (@avik-pal)