t_fn (str, optional, default to None) —
Optional activation function to use on the time embeddings only one time before they as passed to the rest
of the unet. Choose from silu, mish, gelu, and swish.


timestep_post_act (str, *optional*, default to None) -- The second activation function to use in timestep embedding. Choose from silu, mishandgelu`.


time_cond_proj_dim (int, optional, default to None) —
The dimension of cond_proj layer in time