sklearn中的朴素贝叶斯模型及其应用

Posted 2021-01-22 huang201606050002

from sklearn import datasets
iris = datasets.load_iris()

from sklearn.naive_bayes import GaussianNB   #高斯
gnb =GaussianNB()   #构造
pred =gnb.fit(iris.data,iris.target)   #拟合
y_pred =pred.predict(iris.data)     #预测

print(iris.data.shape[0],(iris.target !=y_pred).sum())


from sklearn import datasets
iris = datasets.load_iris()

from sklearn.naive_bayes import BernoulliNB    #贝叶斯模型
gnb =BernoulliNB()   #构造
pred =gnb.fit(iris.data,iris.target)   #拟合
y_pred =pred.predict(iris.data)     #预测

print(iris.data.shape[0],(iris.target !=y_pred).sum())


from sklearn import datasets
iris = datasets.load_iris()

from sklearn.naive_bayes import MultinomialNB    #多项式模型
gnb =MultinomialNB()   #构造
pred =gnb.fit(iris.data,iris.target)   #拟合
y_pred =pred.predict(iris.data)     #预测

print(iris.data.shape[0],(iris.target !=y_pred).sum())

from sklearn.naive_bayes import GaussianNB    ##交叉验证(高斯)
from sklearn.model_selection import cross_val_score
gnb =GaussianNB()
scores= cross_val_score(gnb,iris.data,iris.target,cv=10)
print("Acouracy:%.3f"%scores.mean())

 

from sklearn.naive_bayes import GaussianNB    ##交叉验证(高斯)
from sklearn.model_selection import cross_val_score
gnb =GaussianNB()
scores= cross_val_score(gnb,iris.data,iris.target,cv=10)
print("Acouracy:%.3f"%scores.mean())

from sklearn.naive_bayes import MultinomialNB    ##交叉验证（多项式）
from sklearn.model_selection import cross_val_score
gnb =MultinomialNB()
scores= cross_val_score(gnb,iris.data,iris.target,cv=10)
print("Acouracy:%.3f"%scores.mean())

 

import csv
file_path = r"D:SMSSPamCollection.txt"
sms=open(file_path,‘r‘,encoding=‘utf-8‘)
sms_data=[]
sms_label=[]
csv_reader=csv.reader(sms,delimiter=‘	‘)


for line in csv_reader:
    sms_label.append(line[0])
    sms_data.append(line[1])
sms.close()
sms_data