This is the symbol used for a function approximator, typically a neural network.
This is the symbol used for a function approximator. Typically, it denotes a neural network parametrized by some learnable weights \( \htmlClass{sdt-0000000066}{\theta} \).
The symbol \( \mathcal{N} \) is used to name a function approximator. The approximator is typically realized through a neural network model with learnable weights \( \htmlClass{sdt-0000000066}{\theta} \). The notation \( \mathcal{N}_{\htmlClass{sdt-0000000066}{\theta}} \) highlights this parametrization of the model.