Siren

Siren, or Sinusoidal Representation Network, is a periodic activation function for implicit neural representations. Specifically it uses the sine as a periodic activation function:

$\Phi\left(x\right) = \textbf{W}\_{n}\left(\phi\_{n-1} \circ \phi\_{n-2} \circ \dots \circ \phi\_{0} \right)$