fitrsvm
Fit a support vector machine regression model
Syntax
Description
fitrsvm
trains or crossvalidates a support vector
machine (SVM) regression model on a low through moderatedimensional predictor data
set. fitrsvm
supports mapping the predictor data using kernel
functions, and supports SMO, ISDA, or L1 softmargin minimization via
quadratic programming for objectivefunction minimization.
To train a linear SVM regression model on a highdimensional data set, that is, data
sets that include many predictor variables, use fitrlinear
instead.
To train an SVM model for binary classification, see fitcsvm
for low through moderatedimensional predictor data sets, or
fitclinear
for highdimensional data sets.
returns a full, trained support vector machine (SVM) regression model Mdl
= fitrsvm(Tbl
,ResponseVarName
)Mdl
trained using the predictors values in the table Tbl
and the response values in Tbl.ResponseVarName
.
returns an SVM regression model with additional options specified by one or more namevalue pair arguments, using any of the previous syntaxes. For example, you can specify the kernel function or train a crossvalidated model.Mdl
= fitrsvm(___,Name,Value
)
Examples
Train Linear Support Vector Machine Regression Model
Train a support vector machine (SVM) regression model using sample data stored in matrices.
Load the carsmall
data set.
load carsmall rng 'default' % For reproducibility
Specify Horsepower
and Weight
as the predictor variables (X
) and MPG
as the response variable (Y
).
X = [Horsepower,Weight]; Y = MPG;
Train a default SVM regression model.
Mdl = fitrsvm(X,Y)
Mdl = RegressionSVM ResponseName: 'Y' CategoricalPredictors: [] ResponseTransform: 'none' Alpha: [75x1 double] Bias: 57.3800 KernelParameters: [1x1 struct] NumObservations: 94 BoxConstraints: [94x1 double] ConvergenceInfo: [1x1 struct] IsSupportVector: [94x1 logical] Solver: 'SMO'
Mdl
is a trained RegressionSVM
model.
Check the model for convergence.
Mdl.ConvergenceInfo.Converged
ans = logical
0
0
indicates that the model did not converge.
Retrain the model using standardized data.
MdlStd = fitrsvm(X,Y,'Standardize',true)
MdlStd = RegressionSVM ResponseName: 'Y' CategoricalPredictors: [] ResponseTransform: 'none' Alpha: [77x1 double] Bias: 22.9131 KernelParameters: [1x1 struct] Mu: [109.3441 2.9625e+03] Sigma: [45.3545 805.9668] NumObservations: 94 BoxConstraints: [94x1 double] ConvergenceInfo: [1x1 struct] IsSupportVector: [94x1 logical] Solver: 'SMO'
Check the model for convergence.
MdlStd.ConvergenceInfo.Converged
ans = logical
1
1
indicates that the model did converge.
Compute the resubstitution (insample) meansquared error for the new model.
lStd = resubLoss(MdlStd)
lStd = 16.8551
Train Support Vector Machine Regression Model
Train a support vector machine regression model using the abalone data from the UCI Machine Learning Repository.
Download the data and save it in your current folder with the name 'abalone.csv'
.
url = 'https://archive.ics.uci.edu/ml/machinelearningdatabases/abalone/abalone.data'; websave('abalone.csv',url);
Read the data into a table. Specify the variable names.
varnames = {'Sex'; 'Length'; 'Diameter'; 'Height'; 'Whole_weight';... 'Shucked_weight'; 'Viscera_weight'; 'Shell_weight'; 'Rings'}; Tbl = readtable('abalone.csv','Filetype','text','ReadVariableNames',false); Tbl.Properties.VariableNames = varnames;
The sample data contains 4177 observations. All the predictor variables are continuous except for Sex
, which is a categorical variable with possible values 'M'
(for males), 'F'
(for females), and 'I'
(for infants). The goal is to predict the number of rings (stored in Rings
) on the abalone and determine its age using physical measurements.
Train an SVM regression model, using a Gaussian kernel function with an automatic kernel scale. Standardize the data.
rng default % For reproducibility Mdl = fitrsvm(Tbl,'Rings','KernelFunction','gaussian','KernelScale','auto',... 'Standardize',true)
Mdl = RegressionSVM PredictorNames: {'Sex' 'Length' 'Diameter' 'Height' 'Whole_weight' 'Shucked_weight' 'Viscera_weight' 'Shell_weight'} ResponseName: 'Rings' CategoricalPredictors: 1 ResponseTransform: 'none' Alpha: [3635×1 double] Bias: 10.8144 KernelParameters: [1×1 struct] Mu: [0 0 0 0.5240 0.4079 0.1395 0.8287 0.3594 0.1806 0.2388] Sigma: [1 1 1 0.1201 0.0992 0.0418 0.4904 0.2220 0.1096 0.1392] NumObservations: 4177 BoxConstraints: [4177×1 double] ConvergenceInfo: [1×1 struct] IsSupportVector: [4177×1 logical] Solver: 'SMO' Properties, Methods
The Command Window shows that Mdl
is a trained RegressionSVM
model and displays a property list.
Display the properties of Mdl
using dot notation. For example, check to confirm whether the model converged and how many iterations it completed.
conv = Mdl.ConvergenceInfo.Converged
conv = logical
1
iter = Mdl.NumIterations
iter = 2759
The returned results indicate that the model converged after 2759 iterations.
CrossValidate SVM Regression Model
Load the carsmall
data set.
load carsmall rng 'default' % For reproducibility
Specify Horsepower
and Weight
as the predictor variables (X
) and MPG
as the response variable (Y
).
X = [Horsepower Weight]; Y = MPG;
Crossvalidate two SVM regression models using 5fold crossvalidation. For both models, specify to standardize the predictors. For one of the models, specify to train using the default linear kernel, and the Gaussian kernel for the other model.
MdlLin = fitrsvm(X,Y,'Standardize',true,'KFold',5)
MdlLin = RegressionPartitionedSVM CrossValidatedModel: 'SVM' PredictorNames: {'x1' 'x2'} ResponseName: 'Y' NumObservations: 94 KFold: 5 Partition: [1x1 cvpartition] ResponseTransform: 'none'
MdlGau = fitrsvm(X,Y,'Standardize',true,'KFold',5,'KernelFunction','gaussian')
MdlGau = RegressionPartitionedSVM CrossValidatedModel: 'SVM' PredictorNames: {'x1' 'x2'} ResponseName: 'Y' NumObservations: 94 KFold: 5 Partition: [1x1 cvpartition] ResponseTransform: 'none'
MdlLin.Trained
ans=5×1 cell array
{1x1 classreg.learning.regr.CompactRegressionSVM}
{1x1 classreg.learning.regr.CompactRegressionSVM}
{1x1 classreg.learning.regr.CompactRegressionSVM}
{1x1 classreg.learning.regr.CompactRegressionSVM}
{1x1 classreg.learning.regr.CompactRegressionSVM}
MdlLin
and MdlGau
are RegressionPartitionedSVM
crossvalidated models. The Trained
property of each model is a 5by1 cell array of CompactRegressionSVM
models. The models in the cell store the results of training on 4 folds of observations, and leaving one fold of observations out.
Compare the generalization error of the models. In this case, the generalization error is the outofsample meansquared error.
mseLin = kfoldLoss(MdlLin)
mseLin = 17.2987
mseGau = kfoldLoss(MdlGau)
mseGau = 16.5978
The SVM regression model using the Gaussian kernel performs better than the one using the linear kernel.
Create a model suitable for making predictions by passing the entire data set to fitrsvm
, and specify all namevalue pair arguments that yielded the betterperforming model. However, do not specify any crossvalidation options.
MdlGau = fitrsvm(X,Y,'Standardize',true,'KernelFunction','gaussian');
To predict the MPG of a set of cars, pass Mdl
and a table containing the horsepower and weight measurements of the cars to predict
.
Optimize SVM Regression
This example shows how to optimize hyperparameters automatically using fitrsvm
. The example uses the carsmall
data.
Load the carsmall
data set.
load carsmall
Specify Horsepower
and Weight
as the predictor variables (X
) and MPG
as the response variable (Y
).
X = [Horsepower Weight]; Y = MPG;
Delete rows of X
and Y
where either array has missing values.
R = rmmissing([X Y]); X = R(:,1:end1); Y = R(:,end);
Find hyperparameters that minimize fivefold crossvalidation loss by using automatic hyperparameter optimization.
For reproducibility, set the random seed and use the 'expectedimprovementplus'
acquisition function.
rng default Mdl = fitrsvm(X,Y,'OptimizeHyperparameters','auto',... 'HyperparameterOptimizationOptions',struct('AcquisitionFunctionName',... 'expectedimprovementplus'))
===================================================================================================================================  Iter  Eval  Objective:  Objective  BestSoFar  BestSoFar  BoxConstraint KernelScale  Epsilon  Standardize    result  log(1+loss)  runtime  (observed)  (estim.)      ===================================================================================================================================  1  Best  2.935  1.2233  2.935  2.935  294.5  11.95  0.4572  true   2  Accept  3.1111  0.14188  2.935  2.9768  0.3265  938.31  0.26184  false   3  Accept  11.104  9.9651  2.935  3.0267  439.19  0.047381  0.060061  false   4  Accept  9.0938  11.246  2.935  2.9354  0.0086399  0.0027446  0.61439  false   5  Accept  4.1957  0.14793  2.935  2.9354  0.042678  463.49  0.51289  true   6  Accept  4.1988  0.19473  2.935  2.9355  23.091  0.21904  29.248  true   7  Accept  4.1988  0.14214  2.935  2.9355  130.42  0.0010014  77.154  true   8  Accept  4.1988  0.080622  2.935  2.9358  0.0019018  3.7389  81.645  true   9  Accept  2.9657  0.070464  2.935  2.9353  50.48  1.8895  0.0092774  true   10  Accept  4.1988  0.083159  2.935  2.9357  0.0010556  972.06  719.35  false   11  Best  2.9329  0.24026  2.9329  2.9319  954.64  991.7  0.0098825  false   12  Accept  2.9752  0.15905  2.9329  2.9324  558.61  22.677  0.0092798  true   13  Accept  4.197  0.10496  2.9329  2.9315  0.0012485  981.45  0.0108  false   14  Accept  2.9379  0.10223  2.9329  2.9322  988.74  3.08  0.14121  true   15  Accept  4.1825  0.3108  2.9329  2.9312  986.48  970.39  0.053123  true   16  Best  2.9264  0.43748  2.9264  2.9269  30.843  257.23  0.094026  false   17  Accept  2.9465  0.42523  2.9264  2.9268  0.0010942  0.001003  0.14449  true   18  Accept  4.1988  0.16697  2.9264  2.9275  29.454  669.19  508.64  false   19  Accept  6.0027  10.255  2.9264  2.9272  568.56  0.0042859  0.0093077  true   20  Accept  4.1988  0.077266  2.9264  2.927  0.0012201  0.0010958  792.12  true  ===================================================================================================================================  Iter  Eval  Objective:  Objective  BestSoFar  BestSoFar  BoxConstraint KernelScale  Epsilon  Standardize    result  log(1+loss)  runtime  (observed)  (estim.)      ===================================================================================================================================  21  Accept  4.2071  0.086487  2.9264  2.927  0.0019084  6.6721  0.009295  true   22  Accept  4.1988  0.19208  2.9264  2.927  941.47  86.12  806.48  true   23  Best  2.9041  0.11369  2.9041  2.9037  18.528  558.97  0.010173  false   24  Accept  2.966  0.13494  2.9041  2.9038  460.8  6.2394  0.0097641  true   25  Accept  2.9158  0.087168  2.9041  2.9032  124.87  627.46  0.11174  false   26  Accept  2.9417  0.071682  2.9041  2.9031  0.0010651  0.0066941  0.0095734  true   27  Accept  2.9418  0.13283  2.9041  2.9031  0.001026  0.0013388  0.011524  true   28  Accept  3.299  0.11591  2.9041  2.9032  0.0011384  0.14922  0.012052  true   29  Accept  2.9502  0.07864  2.9041  2.9031  31.89  3.5197  0.15958  true   30  Accept  2.9509  0.49815  2.9041  2.9032  885.18  307.02  0.0094396  false  __________________________________________________________ Optimization completed. MaxObjectiveEvaluations of 30 reached. Total function evaluations: 30 Total elapsed time: 63.4905 seconds Total objective function evaluation time: 37.0863 Best observed feasible point: BoxConstraint KernelScale Epsilon Standardize _____________ ___________ ________ ___________ 18.528 558.97 0.010173 false Observed objective function value = 2.9041 Estimated objective function value = 2.9032 Function evaluation time = 0.11369 Best estimated feasible point (according to models): BoxConstraint KernelScale Epsilon Standardize _____________ ___________ ________ ___________ 18.528 558.97 0.010173 false Estimated objective function value = 2.9032 Estimated function evaluation time = 0.18895
Mdl = RegressionSVM ResponseName: 'Y' CategoricalPredictors: [] ResponseTransform: 'none' Alpha: [93x1 double] Bias: 46.6996 KernelParameters: [1x1 struct] NumObservations: 93 HyperparameterOptimizationResults: [1x1 BayesianOptimization] BoxConstraints: [93x1 double] ConvergenceInfo: [1x1 struct] IsSupportVector: [93x1 logical] Solver: 'SMO'
The optimization searched over BoxConstraint
, KernelScale
, Epsilon
, and Standardize
. The output is the regression with the minimum estimated crossvalidation loss.
Input Arguments
Tbl
— Predictor data
table
Sample data used to train the model, specified as a table. Each
row of Tbl
corresponds to one observation, and
each column corresponds to one predictor variable. Optionally, Tbl
can
contain one additional column for the response variable. Multicolumn
variables and cell arrays other than cell arrays of character vectors
are not allowed.
If Tbl
contains the response variable, and
you want to use all remaining variables in Tbl
as
predictors, then specify the response variable using ResponseVarName
.
If Tbl
contains the response variable, and
you want to use only a subset of the remaining variables in Tbl
as
predictors, then specify a formula using formula
.
If Tbl
does not contain the response variable,
then specify a response variable using Y
. The
length of response variable and the number of rows of Tbl
must
be equal.
If a row of Tbl
or an element of Y
contains
at least one NaN
, then fitrsvm
removes
those rows and elements from both arguments when training the model.
To specify the names of the predictors in the order of their
appearance in Tbl
, use the PredictorNames
namevalue
pair argument.
Data Types: table
ResponseVarName
— Response variable name
name of variable in Tbl
Response variable name, specified as the name of a variable in
Tbl
. The response variable must be a numeric vector.
You must specify ResponseVarName
as a character vector or string
scalar. For example, if Tbl
stores the response variable
Y
as Tbl.Y
, then specify it as
'Y'
. Otherwise, the software treats all columns of
Tbl
, including Y
, as predictors when
training the model.
Data Types: char
 string
formula
— Explanatory model of response variable and subset of predictor variables
character vector  string scalar
Explanatory model of the response variable and a subset of the predictor variables,
specified as a character vector or string scalar in the form
"Y~x1+x2+x3"
. In this form, Y
represents the
response variable, and x1
, x2
, and
x3
represent the predictor variables.
To specify a subset of variables in Tbl
as predictors for
training the model, use a formula. If you specify a formula, then the software does not
use any variables in Tbl
that do not appear in
formula
.
The variable names in the formula must be both variable names in Tbl
(Tbl.Properties.VariableNames
) and valid MATLAB^{®} identifiers. You can verify the variable names in Tbl
by
using the isvarname
function. If the variable names
are not valid, then you can convert them by using the matlab.lang.makeValidName
function.
Data Types: char
 string
Y
— Response data
numeric vector
Response data, specified as an nby1 numeric
vector. The length of Y
and the number of rows
of Tbl
or X
must be equal.
If a row of Tbl
or X
,
or an element of Y
, contains at least one NaN
,
then fitrsvm
removes those rows and elements
from both arguments when training the model.
To specify the response variable name, use the ResponseName
namevalue
pair argument.
Data Types: single
 double
X
— Predictor data
numeric matrix
Predictor data to which the SVM regression model is fit, specified as an nbyp numeric matrix. n is the number of observations and p is the number of predictor variables.
The length of Y
and the number of rows
of X
must be equal.
If a row of X
or an element of Y
contains
at least one NaN
, then fitrsvm
removes
those rows and elements from both arguments.
To specify the names of the predictors in the order of their
appearance in X
, use the PredictorNames
namevalue
pair argument.
Data Types: single
 double
NameValue Arguments
Specify optional pairs of arguments as
Name1=Value1,...,NameN=ValueN
, where Name
is
the argument name and Value
is the corresponding value.
Namevalue arguments must appear after other arguments, but the order of the
pairs does not matter.
Before R2021a, use commas to separate each name and value, and enclose
Name
in quotes.
Example: 'KernelFunction','gaussian','Standardize',true,'CrossVal','on'
trains a 10fold crossvalidated SVM regression model using a Gaussian kernel and standardized training data.
Note
You cannot use any crossvalidation namevalue argument together with the
'OptimizeHyperparameters'
namevalue argument. You can modify the
crossvalidation for 'OptimizeHyperparameters'
only by using the
'HyperparameterOptimizationOptions'
namevalue argument.
BoxConstraint
— Box constraint
positive scalar value
Box constraint for the alpha coefficients, specified as the commaseparated pair consisting of 'BoxConstraint'
and a positive scalar value.
The absolute value of the Alpha
coefficients cannot exceed the value of BoxConstraint
.
The default BoxConstraint
value for the 'gaussian'
or 'rbf'
kernel function is iqr(Y)/1.349
, where iqr(Y)
is the interquartile range of response variable Y
. For all other kernels, the default BoxConstraint
value is 1.
Example: BoxConstraint,10
Data Types: single
 double
KernelFunction
— Kernel function
'linear'
(default)  'gaussian'
 'rbf'
 'polynomial'
 function name
Kernel function used to compute the Gram matrix, specified as the commaseparated pair consisting of 'KernelFunction'
and a value in this table.
Value  Description  Formula 

'gaussian' or 'rbf'  Gaussian or Radial Basis Function (RBF) kernel 
$$G\left({x}_{j},{x}_{k}\right)=\mathrm{exp}\left({\Vert {x}_{j}{x}_{k}\Vert}^{2}\right)$$

'linear'  Linear kernel 
$$G({x}_{j},{x}_{k})={x}_{j}\prime {x}_{k}$$

'polynomial'  Polynomial kernel. Use 'PolynomialOrder', to specify a polynomial kernel of order q . 
$$G({x}_{j},{x}_{k})={(1+{x}_{j}\prime {x}_{k})}^{q}$$

You can set your own kernel function, for example, kernel
, by setting 'KernelFunction','kernel'
. kernel
must have the following form:
function G = kernel(U,V)
U
is an mbyp matrix.V
is an nbyp matrix.G
is an mbyn Gram matrix of the rows ofU
andV
.
And kernel.m
must be on the MATLAB path.
It is good practice to avoid using generic names for kernel functions. For example, call a sigmoid kernel function 'mysigmoid'
rather than 'sigmoid'
.
Example: 'KernelFunction','gaussian'
Data Types: char
 string
KernelScale
— Kernel scale parameter
1
(default)  'auto'
 positive scalar
Kernel scale parameter, specified as the commaseparated pair
consisting of 'KernelScale'
and 'auto'
or
a positive scalar. The software divides all elements of the predictor
matrix X
by the value of KernelScale
.
Then, the software applies the appropriate kernel norm to compute
the Gram matrix.
If you specify
'auto'
, then the software selects an appropriate scale factor using a heuristic procedure. This heuristic procedure uses subsampling, so estimates can vary from one call to another. Therefore, to reproduce results, set a random number seed usingrng
before training.If you specify
KernelScale
and your own kernel function, for example,'KernelFunction','kernel'
, then the software throws an error. You must apply scaling withinkernel
.
Example: 'KernelScale','auto'
Data Types: double
 single
 char
 string
PolynomialOrder
— Polynomial kernel function order
3
(default)  positive integer
Polynomial kernel function order, specified as the commaseparated
pair consisting of 'PolynomialOrder'
and a positive
integer.
If you set 'PolynomialOrder'
and KernelFunction
is
not 'polynomial'
, then the software throws an error.
Example: 'PolynomialOrder',2
Data Types: double
 single
KernelOffset
— Kernel offset parameter
nonnegative scalar
Kernel offset parameter, specified as the commaseparated pair
consisting of 'KernelOffset'
and a nonnegative
scalar.
The software adds KernelOffset
to each element
of the Gram matrix.
The defaults are:
0
if the solver is SMO (that is, you set'Solver','SMO'
)0.1
if the solver is ISDA (that is, you set'Solver','ISDA'
)
Example: 'KernelOffset',0
Data Types: double
 single
Epsilon
— Half the width of epsiloninsensitive band
iqr(Y)/13.49
(default)  nonnegative scalar value
Half the width of the epsiloninsensitive band, specified as
the commaseparated pair consisting of 'Epsilon'
and
a nonnegative scalar value.
The default Epsilon
value is iqr(Y)/13.49
,
which is an estimate of a tenth of the standard deviation using the
interquartile range of the response variable Y
.
If iqr(Y)
is equal to zero, then the default Epsilon
value
is 0.1.
Example: 'Epsilon',0.3
Data Types: single
 double
Standardize
— Flag to standardize predictor data
false
(default)  true
Flag to standardize the predictor data, specified as the commaseparated pair consisting of 'Standardize'
and true
(1
) or false
(0)
.
If you set 'Standardize',true
:
The software centers and scales each column of the predictor data (
X
) by the weighted column mean and standard deviation, respectively (for details on weighted standardizing, see Algorithms). MATLAB does not standardize the data contained in the dummy variable columns generated for categorical predictors.The software trains the model using the standardized predictor matrix, but stores the unstandardized data in the model property
X
.
Example: 'Standardize',true
Data Types: logical
Solver
— Optimization routine
'ISDA'
 'L1QP'
 'SMO'
Optimization routine, specified as the commaseparated pair consisting of 'Solver'
and a value in this table.
Value  Description 

'ISDA'  Iterative Single Data Algorithm (see [30]) 
'L1QP'  Uses quadprog (Optimization Toolbox) to implement L1 softmargin minimization by quadratic programming. This option requires an Optimization Toolbox™ license. For more details, see Quadratic Programming Definition (Optimization Toolbox). 
'SMO'  Sequential Minimal Optimization (see [17]) 
The defaults are:
'ISDA'
if you set'OutlierFraction'
to a positive value'SMO'
otherwise
Example: 'Solver','ISDA'
Alpha
— Initial estimates of alpha coefficients
numeric vector
Initial estimates of alpha coefficients, specified as the commaseparated pair consisting of 'Alpha'
and a numeric vector. The length of Alpha
must be equal to the number of rows of X
.
Each element of
Alpha
corresponds to an observation inX
.Alpha
cannot contain anyNaN
s.If you specify
Alpha
and any one of the crossvalidation namevalue pair arguments ('CrossVal'
,'CVPartition'
,'Holdout'
,'KFold'
, or'Leaveout'
), then the software returns an error.
If Y
contains any missing values, then remove all rows of Y
, X
, and Alpha
that correspond to the missing values. That is, enter:
idx = ~isnan(Y); Y = Y(idx); X = X(idx,:); alpha = alpha(idx);
Y
, X
, and alpha
as the response, predictors, and initial alpha estimates, respectively.
The default is zeros(size(Y,1))
.
Example: 'Alpha',0.1*ones(size(X,1),1)
Data Types: single
 double
CacheSize
— Cache size
1000
(default)  'maximal'
 positive scalar
Cache size, specified as the commaseparated pair consisting
of 'CacheSize'
and 'maximal'
or
a positive scalar.
If CacheSize
is 'maximal'
,
then the software reserves enough memory to hold the entire nbyn Gram matrix.
If CacheSize
is a positive scalar, then the
software reserves CacheSize
megabytes of memory
for training the model.
Example: 'CacheSize','maximal'
Data Types: double
 single
 char
 string
ClipAlphas
— Flag to clip alpha coefficients
true
(default)  false
Flag to clip alpha coefficients, specified as the commaseparated
pair consisting of 'ClipAlphas'
and either true
or false
.
Suppose that the alpha coefficient for observation j is α_{j} and the box constraint of observation j is C_{j}, j = 1,...,n, where n is the training sample size.
Value  Description 

true  At each iteration, if α_{j} is near 0 or near C_{j}, then MATLAB sets α_{j} to 0 or to C_{j}, respectively. 
false  MATLAB does not change the alpha coefficients during optimization. 
MATLAB stores the final values of α in
the Alpha
property of the trained SVM model object.
ClipAlphas
can affect SMO and ISDA convergence.
Example: 'ClipAlphas',false
Data Types: logical
NumPrint
— Number of iterations between optimization diagnostic message output
1000
(default)  nonnegative integer
Number of iterations between optimization diagnostic message
output, specified as the commaseparated pair consisting of 'NumPrint'
and
a nonnegative integer.
If you specify 'Verbose',1
and 'NumPrint',numprint
, then
the software displays all optimization diagnostic messages from SMO and ISDA every
numprint
iterations in the Command Window.
Example: 'NumPrint',500
Data Types: double
 single
OutlierFraction
— Expected proportion of outliers in training data
0 (default)  numeric scalar in the interval [0,1)
Expected proportion of outliers in training data, specified as the commaseparated pair consisting of 'OutlierFraction'
and a numeric scalar in the interval [0,1). fitrsvm
removes observations with large gradients, ensuring that fitrsvm
removes the fraction of observations specified by OutlierFraction
by the time convergence is reached. This namevalue pair is only valid when 'Solver'
is 'ISDA'
.
Example: 'OutlierFraction',0.1
Data Types: single
 double
RemoveDuplicates
— Flag to replace duplicate observations with single observations
false
(default)  true
Flag to replace duplicate observations with single observations in the training data,
specified as the commaseparated pair consisting of
'RemoveDuplicates'
and true
or
false
.
If RemoveDuplicates
is true
, then
fitrsvm
replaces duplicate observations in the training
data with a single observation of the same value. The weight of the single observation
is equal to the sum of the weights of the corresponding removed duplicates (see
Weights
).
Tip
If your data set contains many duplicate observations, then specifying
'RemoveDuplicates',true
can decrease convergence time
considerably.
Data Types: logical
Verbose
— Verbosity level
0
(default)  1
 2
Verbosity level, specified as the commaseparated pair consisting of
'Verbose'
and 0
, 1
, or
2
. The value of Verbose
controls the amount of
optimization information that the software displays in the Command Window and saves the
information as a structure to Mdl.ConvergenceInfo.History
.
This table summarizes the available verbosity level options.
Value  Description 

0  The software does not display or save convergence information. 
1  The software displays diagnostic messages and saves convergence
criteria every numprint iterations, where
numprint is the value of the namevalue pair
argument 'NumPrint' . 
2  The software displays diagnostic messages and saves convergence criteria at every iteration. 
Example: 'Verbose',1
Data Types: double
 single
CategoricalPredictors
— Categorical predictors list
vector of positive integers  logical vector  character matrix  string array  cell array of character vectors  'all'
Categorical predictors list, specified as one of the values in this table.
Value  Description 

Vector of positive integers 
Each entry in the vector is an index value indicating that the corresponding predictor is
categorical. The index values are between 1 and If 
Logical vector 
A 
Character matrix  Each row of the matrix is the name of a predictor variable. The names must match the entries in PredictorNames . Pad the names with extra blanks so each row of the character matrix has the same length. 
String array or cell array of character vectors  Each element in the array is the name of a predictor variable. The names must match the entries in PredictorNames . 
"all"  All predictors are categorical. 
By default, if the
predictor data is in a table (Tbl
), fitrsvm
assumes that a variable is categorical if it is a logical vector, categorical vector, character
array, string array, or cell array of character vectors. If the predictor data is a matrix
(X
), fitrsvm
assumes that all predictors are
continuous. To identify any other predictors as categorical predictors, specify them by using
the CategoricalPredictors
namevalue argument.
For the identified categorical predictors, fitrsvm
creates dummy variables using two different schemes, depending on whether a categorical variable is unordered or ordered. For an unordered categorical variable, fitrsvm
creates one dummy variable for each level of the categorical variable. For an ordered categorical variable, fitrsvm
creates one less dummy variable than the number of categories. For details, see Automatic Creation of Dummy Variables.
Example: 'CategoricalPredictors','all'
Data Types: single
 double
 logical
 char
 string
 cell
PredictorNames
— Predictor variable names
string array of unique names  cell array of unique character vectors
Predictor variable names, specified as a string array of unique names or cell array of unique
character vectors. The functionality of PredictorNames
depends on the
way you supply the training data.
If you supply
X
andY
, then you can usePredictorNames
to assign names to the predictor variables inX
.The order of the names in
PredictorNames
must correspond to the column order ofX
. That is,PredictorNames{1}
is the name ofX(:,1)
,PredictorNames{2}
is the name ofX(:,2)
, and so on. Also,size(X,2)
andnumel(PredictorNames)
must be equal.By default,
PredictorNames
is{'x1','x2',...}
.
If you supply
Tbl
, then you can usePredictorNames
to choose which predictor variables to use in training. That is,fitrsvm
uses only the predictor variables inPredictorNames
and the response variable during training.PredictorNames
must be a subset ofTbl.Properties.VariableNames
and cannot include the name of the response variable.By default,
PredictorNames
contains the names of all predictor variables.A good practice is to specify the predictors for training using either
PredictorNames
orformula
, but not both.
Example: "PredictorNames",["SepalLength","SepalWidth","PetalLength","PetalWidth"]
Data Types: string
 cell
ResponseName
— Response variable name
"Y"
(default)  character vector  string scalar
Response variable name, specified as a character vector or string scalar.
If you supply
Y
, then you can useResponseName
to specify a name for the response variable.If you supply
ResponseVarName
orformula
, then you cannot useResponseName
.
Example: "ResponseName","response"
Data Types: char
 string
ResponseTransform
— Response transformation
'none'
(default)  function handle
Response transformation, specified as either 'none'
or a function
handle. The default is 'none'
, which means @(y)y
,
or no transformation. For a MATLAB function or a function you define, use its function handle for the
response transformation. The function handle must accept a vector (the original response
values) and return a vector of the same size (the transformed response values).
Example: Suppose you create a function handle that applies an exponential
transformation to an input vector by using myfunction = @(y)exp(y)
.
Then, you can specify the response transformation as
'ResponseTransform',myfunction
.
Data Types: char
 string
 function_handle
Weights
— Observation weights
ones(size(X,1),1)
(default)  vector of numeric values
Observation weights, specified as the commaseparated pair consisting of 'Weights'
and a vector of numeric values. The size of Weights
must equal the number of rows in X
. fitrsvm
normalizes the values of Weights
to sum to 1.
Data Types: single
 double
CrossVal
— Crossvalidation flag
'off'
(default)  'on'
Crossvalidation flag, specified as the commaseparated pair consisting of 'CrossVal'
and either 'on'
or 'off'
.
If you specify 'on'
, then the software implements 10fold crossvalidation.
To override this crossvalidation setting, use one of these namevalue pair arguments: CVPartition
, Holdout
, KFold
, or Leaveout
. To create a crossvalidated model, you can use one crossvalidation namevalue pair argument at a time only.
Alternatively, you can crossvalidate the model later using the crossval
method.
Example: 'CrossVal','on'
CVPartition
— Crossvalidation partition
[]
(default)  cvpartition
object
Crossvalidation partition, specified as a cvpartition
object that specifies the type of crossvalidation and the
indexing for the training and validation sets.
To create a crossvalidated model, you can specify only one of these four namevalue
arguments: CVPartition
, Holdout
,
KFold
, or Leaveout
.
Example: Suppose you create a random partition for 5fold crossvalidation on 500
observations by using cvp = cvpartition(500,KFold=5)
. Then, you can
specify the crossvalidation partition by setting
CVPartition=cvp
.
Holdout
— Fraction of data for holdout validation
scalar value in the range (0,1)
Fraction of the data used for holdout validation, specified as a scalar value in the range
[0,1]. If you specify Holdout=p
, then the software completes these
steps:
Randomly select and reserve
p*100
% of the data as validation data, and train the model using the rest of the data.Store the compact trained model in the
Trained
property of the crossvalidated model.
To create a crossvalidated model, you can specify only one of these four namevalue
arguments: CVPartition
, Holdout
,
KFold
, or Leaveout
.
Example: Holdout=0.1
Data Types: double
 single
KFold
— Number of folds
10
(default)  positive integer value greater than 1
Number of folds to use in the crossvalidated model, specified as a positive integer value
greater than 1. If you specify KFold=k
, then the software completes
these steps:
Randomly partition the data into
k
sets.For each set, reserve the set as validation data, and train the model using the other
k
– 1 sets.Store the
k
compact trained models in ak
by1 cell vector in theTrained
property of the crossvalidated model.
To create a crossvalidated model, you can specify only one of these four namevalue
arguments: CVPartition
, Holdout
,
KFold
, or Leaveout
.
Example: KFold=5
Data Types: single
 double
Leaveout
— Leaveoneout crossvalidation flag
"off"
(default)  "on"
Leaveoneout crossvalidation flag, specified as "on"
or
"off"
. If you specify Leaveout="on"
, then for
each of the n observations (where n is the number
of observations, excluding missing observations, specified in the
NumObservations
property of the model), the software completes
these steps:
Reserve the one observation as validation data, and train the model using the other n – 1 observations.
Store the n compact trained models in an nby1 cell vector in the
Trained
property of the crossvalidated model.
To create a crossvalidated model, you can specify only one of these four namevalue
arguments: CVPartition
, Holdout
,
KFold
, or Leaveout
.
Example: Leaveout="on"
Data Types: char
 string
DeltaGradientTolerance
— Tolerance for gradient difference
0 (default)  nonnegative scalar
Tolerance for gradient difference between upper and lower violators obtained by SMO or ISDA, specified as the commaseparated pair consisting of 'DeltaGradientTolerance'
and a nonnegative scalar.
Example: 'DeltaGradientTolerance',1e4
Data Types: single
 double
GapTolerance
— Feasibility gap tolerance
1e3
(default)  nonnegative scalar
Feasibility gap tolerance obtained by SMO or ISDA, specified as the commaseparated pair consisting of 'GapTolerance'
and a nonnegative scalar.
If GapTolerance
is 0
, then fitrsvm
does not use this parameter to check convergence.
Example: 'GapTolerance',1e4
Data Types: single
 double
IterationLimit
— Maximal number of numerical optimization iterations
1e6
(default)  positive integer
Maximal number of numerical optimization iterations, specified
as the commaseparated pair consisting of 'IterationLimit'
and
a positive integer.
The software returns a trained model regardless of whether the
optimization routine successfully converges. Mdl.ConvergenceInfo
contains
convergence information.
Example: 'IterationLimit',1e8
Data Types: double
 single
KKTTolerance
— Tolerance for KKT violation
0  nonnegative scalar value
Tolerance for KarushKuhnTucker (KKT) violation, specified as the commaseparated pair consisting of 'KKTTolerance'
and a nonnegative scalar value.
This namevalue pair applies only if 'Solver'
is 'SMO'
or 'ISDA'
.
If KKTTolerance
is 0
, then fitrsvm
does not use this parameter to check convergence.
Example: 'KKTTolerance',1e4
Data Types: single
 double
ShrinkagePeriod
— Number of iterations between reductions of active set
0
(default)  nonnegative integer
Number of iterations between reductions of the active set, specified as the
commaseparated pair consisting of 'ShrinkagePeriod'
and a
nonnegative integer.
If you set 'ShrinkagePeriod',0
, then the software does not shrink
the active set.
Example: 'ShrinkagePeriod',1000
Data Types: double
 single
OptimizeHyperparameters
— Parameters to optimize
'none'
(default)  'auto'
 'all'
 string array or cell array of eligible parameter names  vector of optimizableVariable
objects
Parameters to optimize, specified as the commaseparated pair consisting of 'OptimizeHyperparameters'
and one of the following:
'none'
— Do not optimize.'auto'
— Use{'BoxConstraint','KernelScale','Epsilon','Standardize'}
.'all'
— Optimize all eligible parameters.String array or cell array of eligible parameter names.
Vector of
optimizableVariable
objects, typically the output ofhyperparameters
.
The optimization attempts to minimize the crossvalidation loss (error) for fitrsvm
by varying the parameters. To control the crossvalidation type and other aspects of the optimization, use the HyperparameterOptimizationOptions
namevalue pair.
Note
The values of 'OptimizeHyperparameters'
override any values you specify
using other namevalue arguments. For example, setting
'OptimizeHyperparameters'
to 'auto'
causes
fitrsvm
to optimize hyperparameters corresponding to the
'auto'
option and to ignore any specified values for the
hyperparameters.
The eligible parameters for fitrsvm
are:
BoxConstraint
—fitrsvm
searches among positive values, by default logscaled in the range[1e3,1e3]
.Epsilon
—fitrsvm
searches among positive values, by default logscaled in the range[1e3,1e2]*iqr(Y)/1.349
.KernelFunction
—fitrsvm
searches among'gaussian'
,'linear'
, and'polynomial'
.KernelScale
—fitrsvm
searches among positive values, by default logscaled in the range[1e3,1e3]
.PolynomialOrder
—fitrsvm
searches among integers in the range[2,4]
.Standardize
—fitrsvm
searches among'true'
and'false'
.
Set nondefault parameters by passing a vector of optimizableVariable
objects that have nondefault values. For example,
load carsmall params = hyperparameters('fitrsvm',[Horsepower,Weight],MPG); params(1).Range = [1e4,1e6];
Pass params
as the value of OptimizeHyperparameters
.
By default, the iterative display appears at the command line,
and plots appear according to the number of hyperparameters in the optimization. For the
optimization and plots, the objective function is log(1 + crossvalidation loss). To control the iterative display, set the Verbose
field of
the 'HyperparameterOptimizationOptions'
namevalue argument. To control the
plots, set the ShowPlots
field of the
'HyperparameterOptimizationOptions'
namevalue argument.
For an example, see Optimize SVM Regression.
Example: 'OptimizeHyperparameters','auto'
HyperparameterOptimizationOptions
— Options for optimization
structure
Options for optimization, specified as a structure. This argument modifies the effect of the
OptimizeHyperparameters
namevalue argument. All fields in the
structure are optional.
Field Name  Values  Default 

Optimizer 
 'bayesopt' 
AcquisitionFunctionName 
Acquisition functions whose names include
 'expectedimprovementpersecondplus' 
MaxObjectiveEvaluations  Maximum number of objective function evaluations.  30 for 'bayesopt' and
'randomsearch' , and the entire grid for
'gridsearch' 
MaxTime  Time limit, specified as a positive real scalar. The time limit is in seconds, as
measured by  Inf 
NumGridDivisions  For 'gridsearch' , the number of values in each dimension. The value can be
a vector of positive integers giving the number of
values for each dimension, or a scalar that
applies to all dimensions. This field is ignored
for categorical variables.  10 
ShowPlots  Logical value indicating whether to show plots. If true , this field plots
the best observed objective function value against the iteration number. If you
use Bayesian optimization (Optimizer is
'bayesopt' ), then this field also plots the best
estimated objective function value. The best observed objective function values
and best estimated objective function values correspond to the values in the
BestSoFar (observed) and BestSoFar
(estim.) columns of the iterative display, respectively. You can
find these values in the properties ObjectiveMinimumTrace and EstimatedObjectiveMinimumTrace of
Mdl.HyperparameterOptimizationResults . If the problem
includes one or two optimization parameters for Bayesian optimization, then
ShowPlots also plots a model of the objective function
against the parameters.  true 
SaveIntermediateResults  Logical value indicating whether to save results when Optimizer is
'bayesopt' . If
true , this field overwrites a
workspace variable named
'BayesoptResults' at each
iteration. The variable is a BayesianOptimization object.  false 
Verbose  Display at the command line:
For details, see the  1 
UseParallel  Logical value indicating whether to run Bayesian optimization in parallel, which requires Parallel Computing Toolbox™. Due to the nonreproducibility of parallel timing, parallel Bayesian optimization does not necessarily yield reproducible results. For details, see Parallel Bayesian Optimization.  false 
Repartition  Logical value indicating whether to repartition the crossvalidation at every
iteration. If this field is The setting
 false 
Use no more than one of the following three options.  
CVPartition  A cvpartition object, as created by cvpartition  'Kfold',5 if you do not specify a crossvalidation
field 
Holdout  A scalar in the range (0,1) representing the holdout fraction  
Kfold  An integer greater than 1 
Example: 'HyperparameterOptimizationOptions',struct('MaxObjectiveEvaluations',60)
Data Types: struct
Output Arguments
Mdl
— Trained SVM regression model
RegressionSVM
model  RegressionPartitionedSVM
crossvalidated model
Trained SVM regression model, returned as a RegressionSVM
model or RegressionPartitionedSVM
crossvalidated model.
If you set any of the namevalue pair arguments KFold
, Holdout
, Leaveout
, CrossVal
, or CVPartition
, then Mdl
is a RegressionPartitionedSVM
crossvalidated model. Otherwise, Mdl
is a RegressionSVM
model.
Limitations
fitrsvm
supports low through moderatedimensional data sets. For highdimensional data set, use fitrlinear
instead.
Tips
Unless your data set is large, always try to standardize the predictors (see
Standardize
). Standardization makes predictors insensitive to the scales on which they are measured.It is good practice to crossvalidate using the
KFold
namevalue pair argument. The crossvalidation results determine how well the SVM model generalizes.Sparsity in support vectors is a desirable property of an SVM model. To decrease the number of support vectors, set the
BoxConstraint
namevalue pair argument to a large value. This action also increases the training time.For optimal training time, set
CacheSize
as high as the memory limit on your computer allows.If you expect many fewer support vectors than observations in the training set, then you can significantly speed up convergence by shrinking the activeset using the namevalue pair argument
'ShrinkagePeriod'
. It is good practice to use'ShrinkagePeriod',1000
.Duplicate observations that are far from the regression line do not affect convergence. However, just a few duplicate observations that occur near the regression line can slow down convergence considerably. To speed up convergence, specify
'RemoveDuplicates',true
if:Your data set contains many duplicate observations.
You suspect that a few duplicate observations can fall near the regression line.
However, to maintain the original data set during training,
fitrsvm
must temporarily store separate data sets: the original and one without the duplicate observations. Therefore, if you specifytrue
for data sets containing few duplicates, thenfitrsvm
consumes close to double the memory of the original data.After training a model, you can generate C/C++ code that predicts responses for new data. Generating C/C++ code requires MATLAB Coder™. For details, see Introduction to Code Generation.
Algorithms
For the mathematical formulation of linear and nonlinear SVM regression problems and the solver algorithms, see Understanding Support Vector Machine Regression.
NaN
,<undefined>
, empty character vector (''
), empty string (""
), and<missing>
values indicate missing data values.fitrsvm
removes entire rows of data corresponding to a missing response. When normalizing weights,fitrsvm
ignores any weight corresponding to an observation with at least one missing predictor. Consequently, observation box constraints might not equalBoxConstraint
.fitrsvm
removes observations that have zero weight.If you set
'Standardize',true
and'Weights'
, thenfitrsvm
standardizes the predictors using their corresponding weighted means and weighted standard deviations. That is,fitrsvm
standardizes predictor j (x_{j}) using$${x}_{j}^{\ast}=\frac{{x}_{j}{\mu}_{j}^{\ast}}{{\sigma}_{j}^{\ast}}.$$
$${\mu}_{j}^{\ast}=\frac{1}{{\displaystyle \sum _{k}{w}_{k}}}{\displaystyle \sum _{k}{w}_{k}{x}_{jk}}.$$
x_{jk} is observation k (row) of predictor j (column).
$${\left({\sigma}_{j}^{\ast}\right)}^{2}=\frac{{v}_{1}}{{v}_{1}^{2}{v}_{2}}{\displaystyle \sum _{k}{w}_{k}{\left({x}_{jk}{\mu}_{j}^{\ast}\right)}^{2}}.$$
$${v}_{1}={\displaystyle \sum _{j}{w}_{j}}.$$
$${v}_{2}={\displaystyle \sum _{j}{\left({w}_{j}\right)}^{2}}.$$
If your predictor data contains categorical variables, then the software generally uses full dummy encoding for these variables. The software creates one dummy variable for each level of each categorical variable.
The
PredictorNames
property stores one element for each of the original predictor variable names. For example, assume that there are three predictors, one of which is a categorical variable with three levels. ThenPredictorNames
is a 1by3 cell array of character vectors containing the original names of the predictor variables.The
ExpandedPredictorNames
property stores one element for each of the predictor variables, including the dummy variables. For example, assume that there are three predictors, one of which is a categorical variable with three levels. ThenExpandedPredictorNames
is a 1by5 cell array of character vectors containing the names of the predictor variables and the new dummy variables.Similarly, the
Beta
property stores one beta coefficient for each predictor, including the dummy variables.The
SupportVectors
property stores the predictor values for the support vectors, including the dummy variables. For example, assume that there are m support vectors and three predictors, one of which is a categorical variable with three levels. ThenSupportVectors
is an mby5 matrix.The
X
property stores the training data as originally input. It does not include the dummy variables. When the input is a table,X
contains only the columns used as predictors.
For predictors specified in a table, if any of the variables contain ordered (ordinal) categories, the software uses ordinal encoding for these variables.
For a variable having k ordered levels, the software creates k – 1 dummy variables. The jth dummy variable is 1 for levels up to j, and +1 for levels j + 1 through k.
The names of the dummy variables stored in the
ExpandedPredictorNames
property indicate the first level with the value +1. The software stores k – 1 additional predictor names for the dummy variables, including the names of levels 2, 3, ..., k.
All solvers implement L1 softmargin minimization.
Let
p
be the proportion of outliers that you expect in the training data. If you set'OutlierFraction',p
, then the software implements robust learning. In other words, the software attempts to remove 100p
% of the observations when the optimization algorithm converges. The removed observations correspond to gradients that are large in magnitude.
References
[1] Clark, D., Z. Schreter, A. Adams. "A Quantitative Comparison of Dystal and Backpropagation." submitted to the Australian Conference on Neural Networks, 1996.
[2] Fan, R.E., P.H. Chen, and C.J. Lin. “Working set selection using second order information for training support vector machines.” Journal of Machine Learning Research, Vol 6, 2005, pp. 1889–1918.
[3] Kecman V., T. M. Huang, and M. Vogt. “Iterative Single Data Algorithm for Training Kernel Machines from Huge Data Sets: Theory and Performance.” In Support Vector Machines: Theory and Applications. Edited by Lipo Wang, 255–274. Berlin: SpringerVerlag, 2005.
[4] Lichman, M. UCI Machine Learning Repository, [http://archive.ics.uci.edu/ml]. Irvine, CA: University of California, School of Information and Computer Science.
[5] Nash, W.J., T. L. Sellers, S. R. Talbot, A. J. Cawthorn, and W. B. Ford. "The Population Biology of Abalone (Haliotis species) in Tasmania. I. Blacklip Abalone (H. rubra) from the North Coast and Islands of Bass Strait." Sea Fisheries Division, Technical Report No. 48, 1994.
[6] Waugh, S. "Extending and Benchmarking CascadeCorrelation: Extensions to the CascadeCorrelation Architecture and Benchmarking of Feedforward Supervised Artificial Neural Networks." University of Tasmania Department of Computer Science thesis, 1995.
Extended Capabilities
Automatic Parallel Support
Accelerate code by automatically running computation in parallel using Parallel Computing Toolbox™.
To perform parallel hyperparameter optimization, use the
'HyperparameterOptimizationOptions', struct('UseParallel',true)
namevalue argument in the call to the fitrsvm
function.
For more information on parallel hyperparameter optimization, see Parallel Bayesian Optimization.
For general information about parallel computing, see Run MATLAB Functions with Automatic Parallel Support (Parallel Computing Toolbox).
GPU Arrays
Accelerate code by running on a graphics processing unit (GPU) using Parallel Computing Toolbox™.
Usage notes and limitations:
You cannot specify the
KernelFunction
namevalue argument as a custom kernel function.You can specify the
Solver
namevalue argument as "SMO
" only.You cannot specify the
OutlierFraction
orShrinkagePeriod
namevalue argument.The predictor data cannot contain infinite values.
fitrsvm
fits the model on a GPU if any of the following apply:The input argument
X
is agpuArray
object.The input argument
Y
is agpuArray
object.The input argument
Tbl
containsgpuArray
predictor or response variables.
Version History
Introduced in R2015bR2023b: "auto"
option of OptimizeHyperparameters
includes Standardize
Starting in R2023b, when you specify "auto"
as the OptimizeHyperparameters
value, fitrsvm
includes Standardize
as an optimizable hyperparameter.
R2023a: fitrsvm
now accepts gpuArray
inputs
(requires Parallel Computing Toolbox)
Starting in R2023a, fitrsvm
supports GPU arrays with some
limitations.
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