I have a hierarchical model with many components.
I want one particular matrix to be sparse and to do so, I am trying to applying L1 regularization to only this matrix involved in my architecture.
So far, I have found discussions about applying L1 reg. to the final loss function, but in this way, I would force the L1 on the overall model, while I want just one matrix to be sparse.
Is there any way to do so?