Activation functions Customized activation functions for supporting various models in 🤗 Diffusers.  GELU  class diffusers.models.activations.GELU  < source > ( dim_in: int dim_out: int approximate: str = 'none' bias: bool = True  )   Parameters   dim_in (int) — The number of channels in the input.   dim_out (int) — The number of channels in the output.   approximate (str, optional, defaults to "none") — If "tanh", use tanh approximation.   bias