Cannot use template above a class using ``TORCH_MODULE`` below its definition

I need to define a generic class as it might take different activation and convolution layers, but when I’m trying to define the template above the class definition in the header file, I got an error from TORCH_MODULE indicating “argument list for the class template is missing”.

template<typename ActivationType, typename ConvType, typename... ConvArgs>
class ResDecoderBlockImpl: public nn::Module {
        BasicConv2d skip_connection;
        nn::Upsample up_sample;
        nn::Sequential seq{nullptr};
        ResDecoderBlockImpl(int, int, int, int, ConvType, ActivationType, ConvArgs...);
        at::Tensor forward(const at::Tensor&, const at::Tensor&);