Activation Functions

Sinusoidal Representation Network

Introduced by Sitzmann et al. in Implicit Neural Representations with Periodic Activation Functions

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

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

Source: Implicit Neural Representations with Periodic Activation Functions

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