Abstract: A facility for generating monotonic fully connected layer blocks for a machine learning model is described. The facility receives an indication of a convex constituent monotonically increasing activation function and a concave constituent monotonically increasing activation function for a monotonic layer. The facility generates a composite monotonic activation function made up of the convex and concave constituent activation functions. The facility receives an indication of a monotonicity indicator vector for the monotonic dense layer block. The facility determines one or more selector weights for the composite activation function. The facility initializes a sign for each weight of one or more kernel weights included in the monotonic layer and initializes a bias vector. The facility generates the monotonic dense layer block based on the composite activation function, the monotonicity indicator vector, the selector weights, the sign for each kernel weight, and the bias vector.