code: def check_positive_flux(cls, kwargs_ps):
          
          pos_bool = True
          for kwargs in kwargs_ps:
              point_amp = kwargs['point_amp']
              for amp in point_amp:
                  if amp < 0:
                      pos_bool = False
                      break
          return pos_bool
docs: check whether inferred linear parameters are positive
  
          :param kwargs_ps:
          :return: bool