gengyanpeng's csdn blog

def datastandard(): from sklearn import preprocessing import numpy as np x = np.array([ [ 1., -1., 2.], [ 2., 0., 0.], [ 0., 1., -1.]]) print('原始数据为：\n',x) print('method1:指定...

tf-idf(t,d) = tf(tf,d) * idf(t) where t means terms, d means document.Using the TfidfTransformer’s default settingsTfidfTransformer(norm='l2', use_idf=True, smooth_idf=True, sublinear_tf=False)idf()

随机整数矩阵生成： np.random.randint(10,size=(3,4))保存excel：writer = pd.ExcelWriter('output.xlsx') df1.to_excel(writer,sheet_name='1逾期数据',index=False,encoding='utf8') writer.save()padas 生成excel 增加sheet表文本分...

查询前一天数据及时间统一mysql 1. 前一天日期格式化：SELECT date_sub(curdate(),interval 1 day) , curdate() 2. 时间格式化：SELECT DATE_FORMAT(CURDATE(),'%Y-%m-%d') 3. 离散时间按天选取：order_time BETWEEN date_sub(curdate(),interval 7 ...