mmf1.py

class MMF1(FloatProblem):

    def __init__(self):
        super(MMF1, self).__init__()
        self.number_of_variables = 2
        self.number_of_objectives = 2
        self.number_of_constraints = 0
        
        self.obj_directions = [self.MINIMIZE, self.MINIMIZE]
        self.obj_labels = ['x', 'y']

        self.lower_bound = [1.,-1.]
        self.upper_bound = [3.,1.]

    def evaluate(self, solution: FloatSolution) -> FloatSolution:
        
        x = solution.variables

        solution.objectives[0] = np.abs(x[0] - 2.)
        solution.objectives[1] = 1.-np.sqrt(np.abs(x[0]-2.))+2*(x[1]-np.sin(6*np.pi*np.abs(x[0]-2.)+np.pi))**2.

        return solution
    
    def get_r(self, solution):
        return solution.variables

    def get_name(self):
        return 'MMF1'