Double Pendulum Dataset

The dataset used in the paper is a double pendulum system, which is a Hamiltonian system with the energy function H(q1, q2, p1, p2) = 1/2 * (m1 * v1^2 + m2 * v2^2) + m1 * g * (l1 * cos(theta1)) + m2 * g * (l2 * cos(theta2 - theta1)) + m2 * g * l2 * cos(theta2).