Features & Methods# Valence Potential Functions Bond Stretching Angle Bending Stretch-Bend Coupling Urey-Bradley Potential Out-of-Plane Bending Improper Dihedral Improper Torsion Torsional Angle Pi-Orbital Torsional Angle Stretch-Torsion Coupling Angle-Torsion Coupling Torsion-Torsion Coupling Van der Waals Potential Functions Integrators and Ensembles Monte Carlo Barostat Berendsen Barostat Verlet Integrator RESPA Integrator Extended Nosé-Hoover Chain Langevin Piston Neural Network Potential Overview Atomic Environment Vector Network Architecture Implementation Details