クラスのインスタンス時のAttributeError

class AdalineGD(object):
    def __init__(self, eta=0.01, n_iter=50, random_state=1):
        self.eta = eta
        self.n_iter = n_iter
        self.random_state = random_state
        
    def fit(self, X , y):
        rgen = np.random.RandomState(self.random_state)
        self.w_ = rgen.normal(loc=0.0, scale=0.01, size=1 + X.shape[1])
        self.cost_ = []
        
        for i in range(self.n_iter):
            net_input = self.net_input(X)
            
            output = self.activation(net_input)
            #誤差の計算
            errors = (y-output)
            #w1〜wmの更新
            self.w_[1:] += self.eta*X.T.dot(errors)
            #w0の更新
            self.w_[0] += self.eta*errors.sum()
            #コスト関数の計算
            cost = (errors**2).sum()/2.0
            #コストの格納
            self.cost_.append(cost)
        return self
    
    def net_input(self, X):
        return np.dot(X, self.w_[1:]) + self.w_[0]
    
    def activation(self, X):
        return X
    
    def predict(self, X):
        return np.where(self.activation(self, net_input(X)) >= 0.0, 1, -1)

ada1 = AdalineGD(n_iter=10, eta=0.01, random_state=1)
ada1.random_state

とすると

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-52-7e8cf0700055> in <module>
      1 ada1 = AdalineGD(n_iter=10, eta=0.01, random_state=1)
----> 2 ada1.random_state

AttributeError: 'AdalineGD' object has no attribute 'random_state'

というエラーが発生します。
何故でしょうか