class Neural_Network(object):
    def __init__(self):
        #define HyperParameter
        self.inputLayerSize = 2
        self.outputLayerSize= 1
        self.hiddenLayerSize= 3
        
    def forward(self,X):
        #X.W = Z
        #
    def sigmoid(z):
        #apply sigmoid activation function
        return 1/(1+np.exp(-z))
    


       