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新手求教matlab的 sequentialfs函数用法

2023-07-10 08:07:19
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Chen
sequentialfs Sequential feature selection.

INMODEL = sequentialfs(FUN,X,Y) selects a subset of features from X
that best predict the data in Y, by sequentially selecting features
until there is no improvement in prediction. X is a data matrix whose
rows correspond to points (or observations) and whose columns
correspond to features (or predictor variables). Y is a column vector
of response values or class labels for each observations in X. X and Y
must have the same number of rows. FUN is a function handle, created
using @, that defines the criterion that sequentialfs uses to select
features and to determine when to stop. sequentialfs returns INMODEL, a
logical vector indicating which features are finally chosen.

Starting from an empty feature set, sequentialfs creates candidate
feature subsets by adding in each of the features not yet selected. For
each candidate feature subset, sequentialfs performs 10-fold
cross-validation by repeatedly calling FUN with different training and
test subsets of X and Y, as follows:

CRITERION = FUN(XTRAIN,YTRAIN,XTEST,YTEST)

XTRAIN and YTRAIN contain the same subset of rows of X and Y, while
XTEST and YTEST contain the complementary subset of rows. XTRAIN and
XTEST contain the data taken from the columns of X that correspond to
the current candidate feature set.

Each time it is called, FUN must return a scalar value CRITERION.
Typically, FUN uses XTRAIN and YTRAIN to train or fit a model, then
predicts values for XTEST using that model, and finally returns some
measure of distance or loss of those predicted values from YTEST. In
the cross-validation calculation for a given candidate feature set,
sequentialfs sums the values returned by FUN across all test sets, and
divides that sum by the total number of test observations. It then uses
that mean value to evaluate each candidate feature subset. Two commonly
used loss measures for FUN are the sum of squared errors for regression
models (sequentialfs computes the mean squared error in this case), and
the number of misclassified observations for classification models
(sequentialfs computes the misclassification rate in this case).

Note: sequentialfs divides the sum of the values returned by FUN across
all test sets by the total number of test observations, therefore FUN
should not divide its output value by the number of test observations.

Given the mean CRITERION values for each candidate feature subset,
sequentialfs chooses the one that minimizes the mean CRITERION value.
This process continues until adding more features does not decrease the
criterion.

INMODEL = sequentialfs(FUN,X,Y,Z,...) allows any number of input
variables X, Y, Z, ... . sequentialfs chooses features (columns) only
from X, but otherwise imposes no interpretation on X, Y, Z, ... .
All data inputs, whether column vectors or matrices, must have the same
number of rows. sequentialfs calls FUN with training and test subsets
of X, Y, Z, ..., as follows:

CRITERION = FUN(XTRAIN,YTRAIN,ZTRAIN,...,XTEST,YTEST,ZTEST,...)

sequentialfs creates XTRAIN, YTRAIN, ZTRAIN, ... and XTEST, YTEST,
ZTEST, ... by selecting subsets of the rows of X, Y, Z, ... . FUN must
return a scalar value CRITERION, but may compute that value in any way.
Elements of the logical vector INMODEL correspond to columns of X, and
indicate which features are finally chosen.

[INMODEL,HISTORY] = sequentialfs(FUN,X,...) returns information on
which feature is chosen in each step. HISTORY is a scalar structure
with the following fields:

Crit A vector containing the criterion values computed at each
step.
In A logical matrix in which row I indicates which features
are included at step I.

[...] = sequentialfs(..., "PARAM1",val1, "PARAM2",val2, ...) specifies
one or more of the following name/value pairs:

"CV" The validation method used to compute the criterion for
each candidate feature subset. Choices are:
a positive integer K - Use K-fold cross-validation (without
stratification). K should be greater
than one.
a CVPARTITION object - Perform cross-validation specified
by the CVPARTITION object.
"resubstitution" - Use resubstitution, i.e., the
original data are passed
to FUN as both the training and test
data to compute the criterion.
"none" - Call FUN as CRITERION =
FUN(X,Y,Z,...), without separating
test and training sets.
The default value of "CV" is 10, i.e., 10-fold
cross-validation (without stratification).

So-called "wrapper" methods use a function FUN that
implements a learning algorithm. These methods usually
apply cross-validation to select features. So-called
"filter" methods use a function that measures the
characteristics (such as correlation) of the data to select
features.

"MCReps" A positive integer indicating the number of Monte-Carlo
repetitions for cross-validation. The default value is 1.
"MCReps" must be 1 if "CV" is "none" or "resubstitution".

"Direction" The direction in which to perform the sequential search.
The default is "forward". If "Direction" is "backward",
sequentialfs begins with a feature set including all
features and removes features sequentially until the
criterion increases.

"KeepIn" A logical vector, or a vector of column numbers, specifying a
set of features which must be included. The default is
empty.

"KeepOut" A logical vector, or a vector of column numbers, specifying a
set of features which must be excluded. The default is
empty.

"NFeatures" The number of features at which sequentialfs should stop.
INMODEL includes exactly this many features. The default
value is empty, indicating that sequentialfs should stop
when a local minimum of the criterion is found. A
non-empty value for "NFeatures" overrides "MaxIter" and
"TolFun" in "Options".

"NullModel" A logical value, indicating whether or not the null model
(containing no features from X) should be included in the
feature selection procedure and in the HISTORY output. The
default is FALSE.

"Options" Options structure for the iterative sequential search
algorithm, as created by STATSET. sequentialfs uses the
following fields:

"Display" Level of display output. Choices are "off" (the
default), "final", and "iter".
"MaxIter" Maximum number of steps allowed. The default is
Inf.
"TolFun" Positive number giving the termination tolerance
for the criterion. The default is 1e-6 if
"Direction" is "forward", or 0 if "Direction" is
"backward".
"TolTypeFun" "abs", to use "TolFun" as an absolute tolerance, or
"rel", to use it as a relative tolerance. The
default is "rel".
"UseParallel"
"UseSubStreams"
"Streams" These fields specify whether to perform cross-
validation computations in parallel, and how to use
random numbers during cross-validation.
For information on these fields see PARALLELSTATS.
NOTE: If supplied, "Streams" must be of length one.

Examples:
% Perform sequential feature selection for CLASSIFY on iris data with
% noisy features and see which non-noise features are important
load("fisheriris");
X = randn(150,10);
X(:,[1 3 5 7 ])= meas;
y = species;
opt = statset("display","iter");
% Generating a stratified partition is usually preferred to
% evaluate classification algorithms.
cvp = cvpartition(y,"k",10);
[fs,history] = sequentialfs(@classf,X,y,"cv",cvp,"options",opt);

where CLASSF is a MATLAB function such as:
function err = classf(xtrain,ytrain,xtest,ytest)
yfit = classify(xtest,xtrain,ytrain,"quadratic");
err = sum(~strcmp(ytest,yfit));

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2023-07-10 01:29:261

ansys 计算时,输出窗口内收敛准则(默认)criterion的计算值超大

这个也算正常,只要能最后收敛就可以了,因为是隐式单元矩阵计算,一般是从最大到做小搜索等,总是有一些值偏离比较大,具体原因就要看有限元数值分析的原理了,没有必要搞清楚,一般也很难搞清楚,那都是数学分析了,还是注重应用吧
2023-07-10 01:29:331

criterion-referenced中文翻译

Criterion - referenced tests 目标参照性考试 Criterion - referenced test 标准参照测验 Total score and cut - score dependabipty of criterion - referenced testing : a generapzabipty study 标准参照测验及其等级线信度的概化理论分析 From items , test and abipty of examinees , the apppcation of information function in the criterion - referenced test has been disscussed in this paper 摘要主要从项目、测验、被试能力三方面来探讨信息函数在标准参照测验中的应用。 Engpsh reading , writing , or puting skills at or below the 8th grade level on a generally accepted standardized test or a parable score on a criterion - referenced test 英语的读,写技能或计算技能达到或者低于公认标准测试的8级水平或标准参照测试的同类评分 Only when the ugeshsa is deconstructed systematically and its special multiple - type is interpreted properly which means it is regarded as diverse types of tests , namely level tests , summative tests , achievement tests and criterion - referenced tests , and so on , the sound ugeshsa will be reasonably constructed 只有通过系统地解构,正确解读高中会考多元复合型的特性? ?水平考试、总结性考试、学业成就考试、标准参照考试… …才能合理地建构起合理的高中会考。
2023-07-10 01:29:411

产地证上面的 origin criterion是什么意思

origin criterion 原产地标准,具体看是什么产地证。
2023-07-10 01:29:594

考试分数 英文怎么说

考试分数英文翻译是Examinationscore。Examinationscore考试分数 双语例句1.Nowtheexaminationscoreservesastheonlycriterionforastudent"sacademicperformance. 现在考试分数是衡量学生学业成绩的唯一标准.2.Otherpeoplearguethattheexaminationscoreisstillanimportantcriterioninmakingadecision.有人认为考试分数在做决定时仍然是一个重要的衡量标准.3.Atpresentexaminationscoreiswidelyacceptedasafairmeansindecision-making.目前,考试分数作为一种公平的做决定的方式广泛为人所接受.4.Reformoftheexaminationmethodsandstructureoftheintegratedtestscore.改革考试办法,实行综合测试和结构评分.5.WhatscoringmethodisusedtoscoretheCPAExamination?美国会计师考试给分的方法为何?6.Igotfullscoreinthefinalexamination.期末考试我得了满分.7.Basedonhismockexam,histeacherisconfidentthathewillscorehighinexamination.根据他的模拟考,他的老师对于他在高考中能取得高分很是自信.
2023-07-10 01:30:201

标准的英语

..世界上没有统一的英语..微软的英语语软件有‘世界标准英语"的选择,大约是逼免了过于美音或英音的用法。
2023-07-10 01:30:444

criterion-referenced test是什么意思

criterion-referenced test网 络标准参照考试双语例句1. At last, a case shows the feasibility of the adequacy measurement and criterion of test cover.最后通过实例应用说明了测试覆盖充分性度量和准则的可行性.2. Practice is the fundamental criterion to test truth – orderly increase and decrease of overall interests. 实践是检验真理的基本标准——整体利益有序增减.
2023-07-10 01:31:241

澳大利亚 产地证 origin criterion怎么填

中澳产地证证原产地证标准打WP
2023-07-10 01:31:333

决策树中criterion 属性为entropy代表的是信息增益还是信息熵

一、最佳拆分如何将纯度增加进行量化呢?用于评价拆分分类目标变量的纯度变量包括:基尼(Gini)CART熵(信息增益)ID3信息增益比率 C5卡方检验 CHAID1、基尼以意大利统计学家和经济学家Corrado Gini的名字命名的拆分标准,它也被生物学家和生态学家用于总体多样性研究,这种方法用于计算从相同的总体中随机选择的两项处于同一类中的概率,对于一个纯的总体,此概率为12、熵和信息增益对于某个指定决策树结点,熵是该结点所代表的全部类中,每个特定类的记录的比例乘以该比例以2为底的对数后的总和,一个拆分的熵就是该拆分产生的所有结点的熵按照每个结点的记录所占比例的加权和。例子:两课决策树,决策树1根节点包括10个正类,10个负类(总共20个样本),左叶节点9个正类,1个负类。右叶结点9个负类,1个正类。决策树2根结点包括10个正类,10个负类,左叶结点6个正类,右叶结点4个正类,10个负类。通过GINI和信息增益判断两棵树的优劣
2023-07-10 01:31:401

Schwarz criterion 是什么意思

施瓦茨标准
2023-07-10 01:31:493

criterion的复数形式

criterion的复数:criteria n.(评判或作决定的)标准,准则,原则 criterion:n.(评判或作决定的)标准,准则,原则 扩展资料   例句:   Each of us will have our own criteria for success.   每个人对于成功都有自己的标准。   British defence policy had to meet three criteria if it was to succeed.   要想奏效,英国的.国防政策必须具备3个条件。   The UN has established detailed criteria for who should be allowed to vote   联合国已经制定了有关投票资格的标准细则。
2023-07-10 01:32:331

criterion 和 level 都有标准的意思 有什么不同的?

criterion :n. (批评,判断的)标准, 准据, 规范。 英英解释:1. a basis for comparison; a reference point against which other things can be evaluated2. the ideal in terms of which something can be judgedlevel : n.水平, 水平面, 水准, 标准, 级别。英英解释:1. a position on a scale of intensity or amount or quality2. a relative position or degree of value in a graded group3. a specific identifiable position in a continuum or series or especially in a process4. height above ground
2023-07-10 01:32:441

criterion的复数

criterion的复数是criteria。criterion是单数,而它的复数也可以使criterions=criteria多用复数criteria意思是标准,尺度类似的词:就象media是medium的复数形式。而medium的复数也可以使mediums=media。criteria属于不规则变化。
2023-07-10 01:32:531

standard和criterion的区别

standardn.标准,规格;旗,军旗;度量衡标准;直立支柱adj.标准的,合格的;普遍的,一般的;公认为优秀的N-COUNT (用以衡量质量的)标准,基准 A standard is something that you use in order to judge the quality of something else.——重点强调质量的衡量criterionn.(批评、判断等的)标准,准则;规范N-COUNT(判定的)标准,准则 A criterion is a factor on which you judge or decide something.——含义更广泛
2023-07-10 01:33:033

standard, norm, criterion 什么区别

standard: 标准,比较通用的一种norm:感觉是一个社会习惯(标准),如:不随地大小便,办事送礼,结婚要生娃等criterion:(单数)标准,是一种评断、评判用的,比如每上一个等级就要符合一些criteria
2023-07-10 01:33:121

criterion同义词

criterion的近义词是:measure;test。励志英文短句推荐:1、The secret of success is constancy to purpose.成功的秘密在于始终如一地忠于目标。2、Don"t throw stones at your neightbours,if your own windows are glass.假如你家的窗户是玻璃做的,别用石头打你的邻居。3、None is of freedom or of life deserving unless he daily conquers it anew.只有每天再度战胜生活,并夺取自由的人才配享受生活的自由。4、Never a negative acknowledge why it is impossible.永远也不要消极地认为什么事是不可能的。5、Brevity is the soul of wit.言以简洁为贵。6、There is no disputing about tastes.人各有所好。
2023-07-10 01:33:211

criterion validity是什么意思

criterion validity效标效度[例句]How to analyze the criterion validity in psychological testing.如何分析心理测验的效标效度。如果你认可我的回答,敬请及时采纳~如果你认可我的回答,请及时点击【采纳为满意回答】按钮~~手机提问的朋友在客户端右上角评价点【满意】即可。~你的采纳是我前进的动力~~O(∩_∩)O,记得好评和采纳,互相帮助
2023-07-10 01:34:091

Code, Standard, Specification, Norm& Criterion的区别

norm,标准,规范的意思,是用于一种比较正式的场合,通常用在一些法律法规,圣经等类似这类文体中.standard 通常就是指一般事物的标准,参照的意思.
2023-07-10 01:34:182

产地证上面的 origin criterion是什么意思

产地证上的origin criterion是原产地证标准。
2023-07-10 01:34:302

ansys 计算时,输出窗口内收敛准则(默认)criterion的计算值超大

这个也算正常,只要能最后收敛就可以了,因为是隐式单元矩阵计算,一般是从最大到做小搜索等,总是有一些值偏离比较大,具体原因就要看有限元数值分析的原理了,没有必要搞清楚,一般也很难搞清楚,那都是数学分析了,还是注重应用吧
2023-07-10 01:35:021

org.hibernate.criterion.Criterion找不到,该怎么解决

直接使用如Criteriacrit=session.createCriteria(User.class);//TwoCriteriaConditionCriterioncr1=Restrictions.eq("empName","Gyan3");Criterioncr2=Restrictions.gt("empId",newInteger(5));//OrCriteriaConditioncrit.add(Restrictions.or(cr1,cr2));
2023-07-10 01:35:111

matlab中lhsdesign函数怎么用啊,

lhsdesignLatin hypercube sampleSyntaxX = lhsdesign(n,p)X = lhsdesign(...,"smooth","off")X = lhsdesign(...,"criterion",criterion)X = lhsdesign(...,"iterations",k)DescriptionX = lhsdesign(n,p) returns an n-by-p matrix, X, containing a latin hypercube sample of n values on each of p variables. For each column of X, the n values are randomly distributed with one from each interval (0,1/n), (1/n,2/n), ..., (1-1/n,1), and they are randomly permuted.X = lhsdesign(...,"smooth","off") produces points at the midpoints of the above intervals: 0.5/n, 1.5/n, ..., 1-0.5/n. The default is "on".X = lhsdesign(...,"criterion",criterion) iteratively generates latin hypercube samples to find the best one according to the criterion criterion, which can be one of the following strings.CriterionDescription"none"No iteration."maximin"Maximize minimum distance between points. This is the default."correlation"Reduce correlation.X = lhsdesign(...,"iterations",k) iterates up to k times in an attempt to improve the design according to the specified criterion. The default is k = 5.
2023-07-10 01:35:214

快来帮帮我,使用rmi时抛出异常java.lang.NoClassDefFoundError: org/hibernate/criterion/Criterion

没导HIBERNATE包吧
2023-07-10 01:35:305

criterion variable是什么意思

亻一起床啦啦啦啦啦啦啦啦啦啦啦啦啦
2023-07-10 01:35:513

criterion-related validity是什么意思

criterion-related validity释义效标关联效度双语例句 1Methods: The split-half method and the equivalent form method were used, and the concurrent validity and predictive validity of the criterion-related validity were tested.方法:采用分半相关法,复本法以及效标关联效度的同时效度和预测效度进行检验。
2023-07-10 01:36:011

standard是什么意思

n. 1. 标准, 水准, 规范2. 平均质量; 业务水平3. 旗帜, 标杆4. 支柱, 基座5. 正常的水平;应达到的标准6. 行为标准;道德水准 7. (很多歌手录制过的)歌曲 8. 法定度量衡标准;法定含量;技术规范;产品规格 9. 准则,准绳;尺度10. 金(或银)的纯度标准(或法定纯度)11. 旗,旗子(如军旗、舰旗等);标志12. 垂直放置之物,竖立的东西adj. 1. 普通的;正常的;通常的;标准的 2. (符合)标准的;按一定规格制作的3. 权威性的4. (拼写、读音、语法等)标准的;规范的5. 模范的;公认为优秀的6. 符合(官方、法律、习惯等)要求的,合格的7. 【商业】中等规格的;一般等级的,最低规格的8. 【园艺】修直挺立的9. 【植物】茎干挺直的10. 【建筑业】有支柱的,用直立柱支撑的有点多意思
2023-07-10 01:36:121

标准参照测验的定量标准是

标准参照测验(Criterion-Referenced Test)又称准则参照测验。标准参照测验的定量标准是合格分数线。标准参照测验(Criterion-Referenced Test)又称准则参照测验。一种精心编制的,在一定的行为领域上按照具体的行为标准水平对被试的测验结果作出直接解释的测验。它为人们提供了有关被试是否达到某种行为标准水平或要求的信息,是一种与以经典测验理论为基础的常模参照测验相对的测验类型。标准参照测验思想的渊源可以追溯得较远,但是标准参照测验理论的产生与发展则是20世纪50年代以后的事情。自1968年以后,标准参照测验的实践也得到了发展。波帕姆及其同事们构建和散发了许多标准参照测验,每一套都与一套可测量的(或详述的)目标相联系。标准参照测验的基本思想:编制的基本原则。标准参照测验的主要目的在于确定被试对某一知识或技能的掌握的真实状况,因而其编制的基本原则为:测量目标必须明确和具体,并且在一测验中不能包含过多的测量目标。测量目标模糊或过多,都不利于测验结果精确描述被试的知识或能力的真实状况。测题必须与测量目标之间具有较高的一致性。每一测验题目的反应必须能体现出所要测量的测量目标上的得为表现。同时,测量同一目标的测题数量既要足够,又要具有较高的同质性。但在测量不同目标的测验题目之间不要求有同质性。
2023-07-10 01:36:431

jsp提交到Servlet,出现java.lang.ClassNotFoundException: org.hibernate.criterion.Criterion 问题

答案很明显的,org.hibernate.criterion.Criterion Criterion这个类没有找到。hibernate jar有问题,去官网重新下个。
2023-07-10 01:37:512

产地证上面的 origin criterion是什么意思

是原产地标准的意思
2023-07-10 01:38:024

秘鲁产地证ORIGIN CRITERION 怎么填

中国--秘鲁产地证 完全国产,无任何进口成分你可以直接打WO。含有进口成份,但是材料和部件具有原产性质,填写:WP产品符合特定原产地标准,填写“PSR”,如货物适用区域价值成分要求的,应注明百分比。例如“PSR
2023-07-10 01:38:111

criterion-related validity是什么意思

效标效度的意思
2023-07-10 01:38:295

如何计算 schwarz bayesian criterion

SBC=-2ln(L)+Lln(n),其中L为极大似然函数,n为观测值个数或说是残差个数,K为未知参数个数,如果是非中心化的ARMA(p,q),则用的是p+q+1,在中心化的ARMA(p,q),则用的是p+q
2023-07-10 01:39:171

spss信度和效度分析怎么做

spss可以做的信度是可信程度,效度一般是结构效度扣扣我
2023-07-10 01:39:276

谁能跟我解释一下Mybatis配置文件中这些语句的含义?最好帮我把里面标签含义说出来就行了

<sql>标签是用来被其他标签引用的。<where>标签就是一个条件标签。<<foreach>就是迭代了。最终得到的结果: where (conditonA=xxx and conditonA=xxx) or (conditonA=xxx and conditonA=xxx) or (.....)
2023-07-10 01:40:062

谁能跟我解释一下Mybatis配置文件中这些语句的含义?最好帮我把里面标签含义说出来就行了

include<iostream>using namespace std;char *deletechar(char *a){int len=strlen(a);char *b=new char();int k=0;for(int i=0;i<len;i++){if(a[i]>="0" && a[i]<="9"){b[k]=a[i];k++;}}
2023-07-10 01:40:142