js正则验证手机号码有效性详解

通过js正则验证手机号码的有效性,方法如下: 验证130-139,150-159,180-189号码段的手机号码 <script type="text/javascript">   var myreg = /^(((...

自己实现KNN算法详解

import numpy as np from math import sqrt from collections import Counter class KNNClassifier(object): """do...

数据分类器详解

自己实现 import numpy as np def train_test_split(X, y, test_ratio=0.2, seed=None): """将数据 X 和 y 按照test_ratio分割...

模型准确度测算详解

自己实现 def accuracy_score(y_true, y_predict): """计算y_true和y_predict之间的准确率""" assert len(y_true) == len(y_pre...

寻找超参数详解

best_score = 0.0 best_k = -1 for k in range(1,11): knn_clf = KNeighborsClassifier(n_neighbors=k) knn_clf....

数据归一化详解

import numpy as np from sklearn import datasets from sklearn.model_selection import train_test_split from sklearn....

简单线性回归预测实现详解

import numpy as np from .metrics import r2_score class SimpleLinearRegression: def __init__(self):...

变量 转换详解

package main import ( "fmt" "strconv" ) func main() { var a int = 65 b := strconv.Itoa(a)...

枚举和位移详解

package main import ( "fmt" ) const ( B float64 = 1 << (iota * 10) KB MB GB )...

循环判断语句详解

package main import ( "fmt" ) func main() { LABLE1: for { for i := 0; i < 10; i++ {...