def check_termination(dF, F, dx_norm, x_norm, ratio, ftol, xtol):
 ftol_satisfied = ((dF < (ftol * F)) and (ratio > 0.25))
 xtol_satisfied = (dx_norm < (xtol * (xtol + x_norm)))
 if (ftol_satisfied and xtol_satisfied):
  return 4
 elif ftol_satisfied:
  return 2
 elif xtol_satisfied:
  return 3
 else:
  return None

def check_termination ( dF , F , dx_norm , x_norm , ratio , ftol , xtol ) : ftol_satisfied = ( ( dF < ( ftol * F ) ) and ( ratio > 0.25 ) ) xtol_satisfied = ( dx_norm < ( xtol * ( xtol + x_norm ) ) ) if ( ftol_satisfied and xtol_satisfied ) : return 4 elif ftol_satisfied : return 2 elif xtol_satisfied : return 3 else : return None
check termination condition for nonlinear least squares .