ates.</p>
<p>For <code>smoothness_orders = 0</code>, only zero-order splines (piece-wise
constant) are generated, which assume the true regression function has no
smoothness or continuity. When <code>smoothness_orders = 1</code>, first-order
splines (piece-wise linear) are generated, which assume continuity of the
true regression function. When <code>smoothness_orders = 2</code>, second-order
splines (piece-wise quadratic and linear terms) are generated, which assume
a the true regression function has a sin