1、使用包party建立决策树 这一节学习使用包party里面的函数ctree()为数据集iris建立一个决策树。 函数ctree()提供一些参数例如MinSplit, MinBusket, MaxSurrogate 和 MaxDepth用来控制决策树的训练。 <- ctree(myFormula, data=trainData) # 检测预测值 > table(predict(iris_ctree), trainData$Species) 显示结果如下: # 打印决策树 > print(iris_ctree) > plot(iris_ctree) > plot(iris_ctree, type="simple") ? ? 因此ctree()现在的版本并不能很好的处理部分属性不明确的值,在实例中既有可能被判到左子树,有时候也会被判到右子树上。
allCate []cate, pid int) []Tree { var arr []Tree for _, v := range allCate { if pid == v.pid { ctree := Tree{} ctree.id = v.id ctree.pid = v.pid ctree.name = v.name sonCate := CategoryTree (allCate, v.id) ctree.son = sonCate arr = append(arr, ctree) } } return arr } 随后调用输出: := Tree{} ctree.id = v.id ctree.pid = v.pid ctree.name = v.name sonCate := CategoryTree (allCate, v.id) ctree.son = sonCate arr = append(arr, ctree) } } return arr } func main(
predictions, testset$churn)) # ################ 好像没怎么发现哪修剪了 5.7 使用条件推理树建立分类模型 rpart传统决策树算法之外,条件推理树ctree # 条件推理树 library(party) ctree.moddel <- ctree(churn~., data = trainset) ctree.moddel 5.8 条件推理树可视化 # 可视化 plot(ctree.moddel) daycharhe.model <- ctree(churn~total_day_charge, data = trainset) plot(daycharhe.model ) 简化一下 5.9 评估预测能力 # 预测 > ctree.predict<- predict(ctree.moddel, testset) > table(ctree.predict, testset $churn) ctree.predict yes no yes 139 9 no 75 1298 confusionMatrix
data.frame(y = gl(3, 50, labels =c("A", "B", "C")), x1 = rnorm(150) + rep(c(1, 0, 50)),x2 = runif(150)) ctree 当然在这里也有对应的ctree_control函数对模型进行参数的设置。 trainData <- iris myFormula <- Species ~ Sepal.Length +Sepal.Width + Petal.Length + Petal.Width iris_ctree <- ctree(myFormula,data=trainData) plot(iris_ctree) ? ##单节点信息 nodes(iris_ctree, 4) ? ##简化决策树的展示 plot(iris_ctree, type="simple") ?
firstchild; }CTBox; typedef struct{ //存储结点的数组 CTBox nodes[MAX_SIZE]; //结点数量和树根的位置 int n,r; }CTree ; /** * @Description: 孩子表示法存储普通树 * @Param: CTree tree 树的结构体变量 * @Return: CTree tree 结构体变量 * @Author : Carlos */ CTree InitTree(CTree tree){ printf("输入节点数量:\n"); scanf("%d",&(tree.n)); for( tree 树的结构体,char a 要查找的节点 * @Return: 无 * @Author: Carlos */ void FindKids(CTree tree,char a){ break; } } if(hasKids==0){ printf("此节点为叶子节点"); } } int main() { CTree
优点: 决策树有易于理解和实现; 决策树可处理数值型和非数值型数据; 基于条件的决策树在party包里 install.packages(“party”) ctree(formula,data CollegePlansTree <- ctree(formula, data=data) plot(CollegePlansTree) plot(CollegePlansTree, type="simple sample(1:total, total*0.7) data.train <- data[index, ] data.test <- data[-index, ] CollegePlansTree <- ctree
关键词:机器学习、条件推断树、Conditional Inference Tree、无偏决策树、party包、统计检验、置换检验、变量选择偏差、可解释AI、R ctree 一句话答案:条件推断树是唯一基于统计假设检验构建 <- ctree(Ozone ~ ., data = airquality)# 查看树结构print(ctree_model)# 可视化plot(ctree_model)# 预测pred <- predict (ctree_model, newdata = airquality)分类任务示例# 使用 iris 数据ctree_iris <- ctree(Species ~ ., data = iris)plot (ctree_iris) ✅ 输出直接显示每个分裂的 p 值,便于科研报告。 (target ~ ., data = df) saveRDS(model, "ctree_model.rds")''')方案2:使用 sklearn + 自定义检验(近似) ⚠️ 无法完全复现,
条件推断树可由party包中的ctree()函数获得。 library(party) fit.ctree <- ctree(class ~ ., data=df.train) plot(fit.ctree, main="Conditional Inference Tree") ctree.pred <- predict(fit.ctree, df.validate, type="response") ctree.perf <- table(df.validate $class, ctree.pred, dnn=c("Actual", "Predicted")) ctree.perf ?
', 'children': [] }] }, { 'name': 'Angular' } ]; <template> <cTree :data="myData"></cTree> </template>
此处,我们讲述的连续变量最优分段算法是基于条件推理树(conditional inference trees, Ctree)的递归分割算法,其基本原理是根据自变量的连续分布与因变量的二元分布之间的关系, 采用递归的回归分析方法,逐层递归满足给定的显著性水平,此时获取的分段结果(位于Ctree的叶节点上)即为连续变量的最优分段。 其核心算法用函数ctree()表示。 根据表3.13所示的定量入模指标,我们采用上述最优分段算法,得到的最优分段结果分别如下。
+++++++++ cInitRouter connInitRouter // 全部的Connector初始化路由ciLock sync.RWMutex // cInitRouter 锁cTree /全部Connector管理路由connectors map[string]Connector // 全部的Connector对象cLock sync.RWMutex // cTree ok {//cid 首次注册,不存在,创建二级树NsConnSLpool.cTree[cname] = make(connSL)//初始化各类型FunctionModepool.cTree[cname] [common.S] = make(connFuncRouter)pool.cTree[cname][common.L] = make(connFuncRouter)}if _, ok := pool.cTree ok {pool.cTree[cname][mode][fname] = c} else {errString := fmt.Sprintf("CaaS Repeat CName=%s, FName=%
cluster.stats 2、分类 常用的包: rpart,party,randomForest,rpartOrdinal,tree,marginTree, maptree,survival 决策树:rpart,ctree
sh.SendKeys "shell{ENTER}" >>tmp.vbs echo WScript.Sleep 1000 >>tmp.vbs echo sh.SendKeys "cp /mnt/jffs2/hw_ctree.xml cscript //nologo tmp.vbs del tmp.vbs 2.手敲代码获取 telnet 192.168.1.1 root adminHW su shell cp /mnt/jffs2/hw_ctree.xml
goUp (r, ((RightSibling x l):ps)) = (Node x l r, ps) 走两步试玩一下,还走之前的场景,先找3,再找1,即先向左向右,再上去,最后向左: > let cTree = (tree, []) > let focus = goLeft (goUp (goRight (goLeft cTree))) > fst focus Node 1 EmptyTree EmptyTree 再把1改成0: > let modified = modifyTreeWithContext (goLeft (goUp (modifyTreeWithContext (goRight (goLeft cTree 看起来不太清楚,利用工具函数: x +> f = f x m = flip modifyTreeWithContext 简单变换一下,以更自然的方式来描述: > fst $ backToRoot $ cTree
2、分类 常用的包: rpart,party,randomForest,rpartOrdinal,tree,marginTree, maptree,survival 决策树: rpart, ctree
;//孩子链表的头指针 }CTBox; typedef struct { CTBox nodes[MAX_SIZE];//存储结点的数组 int n, r;//结点数量和树根的位置 }CTree ; //孩子表示法存储普通树 CTree initTree(CTree tree) { printf("输入节点数量:\n"); scanf("%d", &(tree.n)); newEle; p = p->next; } } } return tree; } void findKids(CTree break; } } if (hasKids == 0) { printf("此节点为叶子节点"); } } int main() { CTree
install.packages(“party”) ctree(formula, data) formula - 是描述预测变量和响应变量的公式。 output.tree <- ctree( nativeSpeaker ~ age + shoeSize + score, data = input.dat) # Plot the tree
=0 && graph[pos][i]<dis[i] ) { dis[i]=graph[pos][i]; pre[i]=pos; } } } } //次最小生成树 int ctree cin.open("min.in",ios::in); cin>>n>>m; init(); read(); prim(1); cout<<minWeight<<endl; int res= ctree dis[pos]>maxWeight[i][ pre[pos][1] ) maxWeight[i][ pre[pos][1]= dis[pos]; //……省略 } int ctree
cluster.stats 2、分类 常用的包: rpart,party,randomForest,rpartOrdinal,tree,marginTree, maptree,survival 决策树: rpart, ctree
命令窗口,输入命令:telnet 192.168.1.1 用户名:root,密码:admin 成功登录后,输入命令:shell 再次输入命令:grep telecomadmin /mnt/jffs2/hw_ctree.xml 或者以下两行命令 vi /mnt/jffs2/hw_ctree.xml /telecomadmin 就能轻松获取到超级管理密码了,拿到密码后,配置就简单了,都是大同小异,一找就能找到。