62 lines
1.6 KiB
Python
62 lines
1.6 KiB
Python
import numpy as np
|
|
import pandas as pd
|
|
import matplotlib.pyplot as plt
|
|
from sklearn.model_selection import train_test_split
|
|
from sklearn.preprocessing import StandardScaler
|
|
|
|
# 資料預處理
|
|
dataset = pd.read_csv("Social_Network_Ads.csv")
|
|
X = dataset.iloc[:, [2,3]].values
|
|
Y = dataset.iloc[:, 4].values
|
|
|
|
X_train, X_test, Y_train, Y_test = train_test_split(X, Y, test_size=0.25, random_state=0)
|
|
|
|
sc = StandardScaler()
|
|
X_train = sc.fit_transform(X_train)
|
|
X_test = sc.transform(X_test)
|
|
|
|
# 擬合和預測
|
|
from sklearn.linear_model import LogisticRegression
|
|
|
|
classifier = LogisticRegression(random_state=0)
|
|
|
|
classifier.fit(X_train, Y_train)
|
|
|
|
Y_pred = classifier.predict(X_test)
|
|
|
|
print(Y_test)
|
|
print(Y_pred)
|
|
|
|
# 評估性能
|
|
from sklearn.metrics import confusion_matrix
|
|
|
|
cm = confusion_matrix(Y_test, Y_pred)
|
|
|
|
print(cm)
|
|
|
|
# 視覺化
|
|
from matplotlib.colors import ListedColormap
|
|
|
|
X_set, y_set = X_test, Y_test
|
|
|
|
X1, X2 = np.meshgrid(np.arange(start = X_set[:, 0].min() - 1, stop = X_set[:, 0].max() + 1, step = 0.01),
|
|
np.arange(start = X_set[:, 1].min() - 1, stop = X_set[:, 1].max() + 1, step = 0.01))
|
|
|
|
plt.contourf(X1, X2, classifier.predict(np.array([X1.ravel(), X2.ravel()]).T).reshape(X1.shape),
|
|
alpha = 0.75, cmap = ListedColormap(('red', 'green')))
|
|
|
|
plt.xlim(X1.min(), X1.max())
|
|
plt.ylim(X2.min(), X2.max())
|
|
|
|
for i, j in enumerate(np.unique(y_set)):
|
|
plt.scatter(X_set[y_set == j, 0], X_set[y_set == j, 1],
|
|
c = ListedColormap(('orange', 'blue'))(i), label = j)
|
|
|
|
plt.title('Logistic Regression (Training set)')
|
|
|
|
plt.xlabel('Age')
|
|
plt.ylabel('Estimated Salary')
|
|
|
|
plt.legend()
|
|
|
|
plt.show() |