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- Mrsls 2019-08-03
from matplotlib.colors import ListedColormap def plot_decision_region(X, y, classifier, resolution=0.02): marker = ('s', 'x', 'o', 'v') colors = ('red', 'blue', 'lightgreen', 'gray', 'cyan') cmap = ListColormap(colors[:len(np.unique(y))]) x1_min, x1_max = X[:, 0].min() - 1, X[:, 0].max() x2_min, x2_max = X[:, 1].min() - 1, X[:, 1].max() # 将np.arange()中的向量扩展成一个矩阵 ''' xx1: a = np.arange(x1_min, x1_max, resolution) 向量元素为185个 xx1[255, 185],将a中的元素作为一行，重复255行 xx2: b = np.arange(x2_min, x2_max, resolution) 向量元素为255个 xx2[255, 185],将b中的元素作为一列，重复185列 ''' xx1, xx2 = np.mesbgrid(np.arange(x1_min, x1_max, resolution), np.arrange(x2_min, x2_max, resolution))- 1赞 · 0采集
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- Leto2020 2018-01-19
- Z =Z.reshape(xx1.shape) plt.contourf(xx1,xx2,Z,alpha=0.4, cmap=cmap) plt.xlim(xx1.min(),xx1.max()) plt.ylim(xx2.min(),xx2.max()) for idx,cl in enumerate(np.unique(y)): plt.scatter(x=x[y==cl,0],y=X[y==cl,1],alpha=0.8,c=cmap(idx), marker =markers[idx],label=cl) plot_decision_regions(X,y,ppn,resolution=0.02) plt.xlabel('花径长度') plt.ylabel('花瓣长度') plt.legend(loc='upper left') plt.show()
- 0赞 · 0采集
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- Leto2020 2018-01-19
- ppn =Perceptron(eta=0.1,n_iter=10) ppn.fit(X,y) plot.plot(range(1,len(ppn.errors_)+1),ppn.errors_,marker='o') plt.xlabel('Epochs') plt.ylabel('错误分类次数') #plt.show() from matplotlib.colors import ListedColormap def plot_decision_regions(X,y,classifier,resolution=0.02): marker = ('s','x','o','v') colors =('red','blue','lightgreen','gray','cyan') cmap =ListedColormap(colors[:len(np.unique(y))]) x1_min,x1_max =X[:,0].min() -1, X[:,0].max() x2_min,x2_max =X[:,1].min() -1, X[:,1].max() print(x1_min,x1_max) print(x2_min,x2_max) xx1,xx2 =np.meshgrid(np.arange(x1_min,x1_max,resolution), np.arange(x2_min,x2_max,reolution)) #print(np.arange(x1_min,x1_max,resolution).shape) #print(np.arange(x1_min,x1_max,resolution)) #print(xx1.shape) #print(xx1) Z =classifier.predict(np.array([xx1.ravel(),xx2,ravel()]).T) print(xx1.ravel()) print(xx2.ravel()) print(Z)
- 0赞 · 0采集
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- Cone_on 2017-09-28
- meshgrid函数的作用是把构造的向量扩展成二维矩阵
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截图1赞 · 0采集
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- qq_恒_21 2017-07-14
- mark20170714221500
- 0赞 · 0采集
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- zjuPeco 2017-05-16
- 程序记录6
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截图0赞 · 0采集
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- zjuPeco 2017-05-16
- 程序记录5
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截图0赞 · 0采集
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