Built-in regularizers.
class L1L2: A regularizer that applies both L1 and L2 regularization penalties.
class Regularizer: Regularizer base class.
l1(...): Create a regularizer that applies an L1 regularization penalty.
l1_l2(...): Create a regularizer that applies both L1 and L2 penalties.
l2(...): Create a regularizer that applies an L2 regularization penalty.