Got error message before with v1.8. I hope this fixes it.

src/layers/bias_layer.jl

@@ -1,7 +1,7 @@
 @doc raw"""
 A *bias layer* that does nothing more than add a vector to the input. This is needed for *LA-SympNets*.
 """
-struct BiasLayer{M, M} <: SympNetLayer{M, M}
+struct BiasLayer{M, N} <: SympNetLayer{M, N}
 end
 
 function BiasLayer(M::Int)