python机器学习-乳腺癌细胞挖掘（博主亲自录制视频）
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生成2类数据
n_features :特征个数= n_informative（） + n_redundant + n_repeated
n_informative：多信息特征的个数
n_redundant：冗余信息，informative特征的随机线性组合
n_repeated ：重复信息，随机提取n_informative和n_redundant 特征
n_classes：分类类别
n_clusters_per_class ：某一个类别是由几个cluster构成的
from sklearn import preprocessing import numpy as np #生成分类数据的分类器 from sklearn.datasets.samples_generator import make_classification #自动生成训练数据和测试数据 from sklearn.cross_validation import train_test_split #导入支持向量模型 from sklearn.svm import SVC import matplotlib.pyplot as plt x,y=make_classification(n_samples=300,n_features=2,n_redundant=0,n_informative=2,random_state=22,n_clusters_per_class=1,scale=100) #c=y表示color为黄色 plt.scatter(x[:,0],x[:,1],c=y) plt.show()
生成4类数据
# -*- coding: utf-8 -*- """ Created on Sun Jan 7 15:54:56 2018 @author: Administrator """ from sklearn import preprocessing import numpy as np #生成分类数据的分类器 from sklearn.datasets.samples_generator import make_classification #自动生成训练数据和测试数据 from sklearn.cross_validation import train_test_split #导入支持向量模型 from sklearn.svm import SVC import matplotlib.pyplot as plt #n_classes=4生成4类数据 x,y=make_classification(n_classes=4,n_samples=300,n_features=2,n_redundant=0,n_informative=2,random_state=22,n_clusters_per_class=1,scale=100) #c=y表示color为黄色 plt.scatter(x[:,0],x[:,1],c=y) plt.show()
# -*- coding: utf-8 -*-
"""
Created on Sun Jan 7 16:51:38 2018
@author: Administrator
"""
import matplotlib.pyplot as plt
from sklearn.datasets import make_classification
from sklearn.datasets import make_blobs
from sklearn.datasets import make_gaussian_quantiles
from sklearn.datasets import make_hastie_10_2
plt.figure(figsize=(8, 8))
plt.subplots_adjust(bottom=.05, top=.9, left=.05, right=.95)
plt.subplot(421)
plt.title("One informative feature, one cluster per class", fontsize='small')
X1, Y1 = make_classification(n_samples=1000,n_features=2, n_redundant=0, n_informative=1,
n_clusters_per_class=1)
plt.scatter(X1[:, 0], X1[:, 1], marker='o', c=Y1)
plt.subplot(422)
plt.title("Two informative features, one cluster per class", fontsize='small')
X1, Y1 = make_classification(n_samples=1000,n_features=2, n_redundant=0, n_informative=2,
n_clusters_per_class=1)
plt.scatter(X1[:, 0], X1[:, 1], marker='o', c=Y1)
plt.subplot(423)
plt.title("Two informative features, two clusters per class", fontsize='small')
X2, Y2 = make_classification(n_samples=1000,n_features=2, n_redundant=0, n_informative=2)
plt.scatter(X2[:, 0], X2[:, 1], marker='o', c=Y2)
plt.subplot(424)
plt.title("Multi-class, two informative features, one cluster",
fontsize='small')
X1, Y1 = make_classification(n_samples=1000,n_features=2, n_redundant=0, n_informative=2,
n_clusters_per_class=1, n_classes=3)
plt.scatter(X1[:, 0], X1[:, 1], marker='o', c=Y1)
plt.subplot(425)
plt.title("Three blobs", fontsize='small')
X1, Y1 = make_blobs(n_samples=1000,n_features=2, centers=3)
plt.scatter(X1[:, 0], X1[:, 1], marker='o', c=Y1)
plt.subplot(426)
plt.title("Gaussian divided into four quantiles", fontsize='small')
X1, Y1 = make_gaussian_quantiles(n_samples=1000,n_features=2, n_classes=4)
plt.scatter(X1[:, 0], X1[:, 1], marker='o', c=Y1)
plt.subplot(427)
plt.title("hastie data ", fontsize='small')
X1, Y1 = make_hastie_10_2(n_samples=1000)
plt.scatter(X1[:, 0], X1[:, 1], marker='o', c=Y1)
plt.show()
# -*- coding: utf-8 -*-
"""
Created on Sun Jan 7 16:29:35 2018
@author: Administrator
"""
import matplotlib.pyplot as plt
from sklearn.datasets import make_classification
from sklearn.datasets import make_blobs
from sklearn.datasets import make_gaussian_quantiles
from sklearn.datasets import make_hastie_10_2
#画布的大小为长20cm高20cm
plt.figure(figsize=(15,10))
#标题，fontsize为标题字体大小
plt.title("Gaussian divided into six quantiles", fontsize='large')
X1, Y1 = make_gaussian_quantiles(n_samples=1000,n_features=2, n_classes=6)
#绘制点，X1[:, 0]为点的x列表值， X1[:, 1]为点的y列表值， c=Y1表示颜色，c为color缩写
plt.scatter(X1[:, 0], X1[:, 1], marker='o', c=Y1)
# -*- coding: utf-8 -*-
"""
Created on Sun Jan 7 16:51:38 2018
@author: Administrator
"""
from sklearn.datasets import make_circles
from sklearn.datasets import make_moons
import matplotlib.pyplot as plt
import numpy as np
#画布的大小为长20cm高20cm
plt.figure(figsize=(15,10))
fig=plt.figure(1)
x1,y1=make_circles(n_samples=1000,factor=0.5,noise=0.1)
plt.subplot(121)
plt.title('make_circles function example')
plt.scatter(x1[:,0],x1[:,1],marker='o',c=y1)
plt.subplot(122)
x1,y1=make_moons(n_samples=1000,noise=0.1)
plt.title('make_moons function example')
plt.scatter(x1[:,0],x1[:,1],marker='o',c=y1)
plt.show()
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