We can implement `Regularizer` for each layer. The regularizers are applied on a per-layer basis. Here are 3 things that we can do: 1. Regularizer Class. 2. Layers class to use regularizer. (we can set a new parameter) 3. Regularizer Documentation. 4. Regularizer Test. I will start a PR to solve 1 and 3. The rest part should be discussed before coding.