It seems like you're interested in the concept of "Delta-Delta Connection" in the context of transformers. However, as of my last knowledge update in September 2021, I'm not aware of any specific concept or term related to "Delta-Delta Connection" in the context of transformers.
Transformers are a type of neural network architecture that has been widely used for various natural language processing tasks. They consist of an encoder-decoder structure, self-attention mechanisms, and multiple layers of computation. If "Delta-Delta Connection" is a term or concept that has emerged after my last update, I would not have information about it.
If you could provide more context or details about what you're referring to with "Delta-Delta Connection," I'd be happy to help with any information I have up to my last update.