Question

我正在研究一个python程序。我创建了一个名为＆＃34; Perception＆＃34;的类。代码如下：

＆＃13;

import numpy as np
class Perceptron(object):

    def __init__(self, eta=0.01, n_iter=10):
        self.eta=eta
        self.n_iter=n_iter


    def fit(self, X, y):
        self.w_=np.zeros(1+X.shape[1])
        self.errors_ = []

        for _ in range(self.n_iter):
            errors =0
            for xi,target in zip(X,y):
                update = self.eta * (target - self.predict(xi))
                self.w_[1:] += update * xi
                self.w_[0] += update
                errors += int(update != 0.0)
            self.errors_.append(errors)
        return self

    def net_input(self, X):
        """Calculate net input"""
        return np.dot(X, self.w_[1:]) + self.w_[0]

    def predict(self, X):
        """Return class label after unit step"""
        return np.where(self.net_input(X) >= 0.0, 1, -1)

＆＃13;

当我想在以下行中声明该类时：

ppn = Perceptron(eta=0.1, n_iter=10)

我收到以下错误：

NameError：name＆＃39; Perceptron＆＃39;未定义

我是Python新手。请在接下来的步骤中帮助我。并提前致谢。

Answer 1

Run this it should work , if not share the screen hot of code and output.
import numpy as np
class Perceptron(object):

    def __init__(self, eta=0.01, n_iter=10):
        self.eta=eta
        self.n_iter=n_iter


    def fit(self, X, y):
        self.w_=np.zeros(1+X.shape[1])
        self.errors_ = []

        for _ in range(self.n_iter):
            errors =0
            for xi,target in zip(X,y):
                update = self.eta * (target - self.predict(xi))
                self.w_[1:] += update * xi
                self.w_[0] += update
                errors += int(update != 0.0)
            self.errors_.append(errors)
        return self

    def net_input(self, X):
        """Calculate net input"""
        return np.dot(X, self.w_[1:]) + self.w_[0]

    def predict(self, X):
        """Return class label after unit step"""
        return np.where(self.net_input(X) >= 0.0, 1, -1)



ppn = Perceptron(eta=0.1, n_iter=10)

Answer 2

您应该调用ppn = Perceptron.Perceptron（eta = 0.1，n_iter = 10）

NameError：name＆＃39; classname＆＃39;在python中没有定义错误

2 个答案: