In controlnet, why is there a sample + controlnet_cond preprocess step. I don't see this mention in the paper

[tinder-trideeprath]

This preprocess step is not clear, what is the requirement for this ?

https://github.com/huggingface/diffusers/blob/main/src/diffusers/models/controlnet.py#L798

        sample = self.conv_in(sample)

        controlnet_cond = self.controlnet_cond_embedding(controlnet_cond)
        sample = sample + controlnet_cond

[sayakpaul]

You can refer to the original implementation of ControlNet to confirm that.