AttributeError                            Traceback (most recent call last)<ipython-input-10-1d89fbca2738> in <module>()      1 ppn = Perceptron(eta=0.1, n_iter=10)----> 2 ppn.fit(X, y)      3 plt.plot(range(1, len(ppn.errors_) + 1), ppn.errors_ , marker = 'o')      4 plt.xlabel('Epochs')      5 plt.ylabel('错误份分类次数')<ipython-input-5-5380c51dbd83> in fit(self, X, y)     24         加1 是因为前面算法提到的w0,也就是步调函数阈值     25         """---> 26         self.w_ = np.zero(1 + X.shape[1])     27         self.errors_ = []     28         for _ in range(self.n_iter) :AttributeError: module 'numpy' has no attribute 'zero'