For manipulation of output or inputs, there are several basic utility functionalities for transformation of variables, predicted parameters, or computations. Some are used internally by the estimating equations but are also made available to users.
delicatessen.utilities
logit inverse_logit identity robust_loss_functions spline regression_predictions polygamma digamma standard_normal_cdf standard_normal_pdf
additive_design_matrix
delicatessen.derivative
approx_differentiation auto_differentiation