code: def get_transformation(self, coordinates):
          
          atom1, atom2 = self.hinge_atoms
          direction = coordinates[atom1] - coordinates[atom2]
          direction /= np.linalg.norm(direction)
          direction *= np.random.uniform(-self.max_amplitude, self.max_amplitude)
          result = Translation(direction)
          return result
docs: Construct a transformation object