如何获得预测值和测试数据，并可视化实际与预测？

Posted 2023-03-12

【中文标题】如何获得预测值和测试数据，并可视化实际与预测？

【英文标题】：How to get predicted values along with test data, and visualize actual vs predicted?

【发布时间】：2020-01-18 14:04:02

【问题描述】：

from sklearn import datasets
import numpy as np
import pandas as pd from sklearn.model_selection
import train_test_split
from sklearn.linear_model import Perceptron

data = pd.read_csv('student_selection.csv')

x = data[['Average','Pass','Division','Domicile']]
y = data[['Selected']]

x_train,x_test,y_train,y_test train_test_split(x,y,test_size=1,random_state=0)

ppn = Perceptron(eta0=1.0, fit_intercept=True, max_iter=1000, n_iter_no_change=5, random_state=0)

ppn.fit(x_train, y_train)

y_pred = ppn.predict(x_train)

x_train['Predicted'] = pd.Series(y_pred)

如何以表格和图表的形式查看实际与预测？ x_train 是我得到的预测值，但我无法将其与实际数据合并以查看偏差。

【参考方案1】：

如何以表格和图表的形式查看实际与预测的对比？

只要运行：

y_predict= pnn.predict(x)

data['y_predict'] = y_predict

并在您的数据框中拥有该列，如果您想绘制它，您可以使用：

import matplotlib.pyplot as plt
plt.scatter(data['Selected'], data['y_predict'])
plt.show()