README
    Libsvm is a simple, easy-to-use, and efficient software for SVM
    classification and regression. It solves C-SVM classification, nu-SVM
    classification, one-class-SVM, epsilon-SVM regression, and nu-SVM
    regression. It also provides an automatic model selection tool for
    C-SVM classification. This document explains the use of libsvm.
    
    Libsvm is available at 
    http://www.csie.ntu.edu.tw/~cjlin/libsvm
    Please read the COPYRIGHT file before using libsvm.
    
    Table of Contents
    =================
    
    - Quick Start
    - Installation and Data Format
    - `svm-train' Usage
    - `svm-predict' Usage
    - `svm-scale' Usage
    - Tips on Practical Use
    - Examples
    - Precomputed Kernels 
    - Library Usage
    - Java Version
    - Building Windows Binaries
    - Additional Tools: Sub-sampling, Parameter Selection, Format checking, etc.
    - MATLAB/OCTAVE Interface
    - Python Interface
    - Additional Information
    
    Quick Start
    ===========
    
    If you are new to SVM and if the data is not large, please go to 
    `tools' directory and use easy.py after installation. It does 
    everything automatic -- from data scaling to parameter selection.
    
    Usage: easy.py training_file [testing_file]
    
    More information about parameter selection can be found in
    `tools/README.'
    
    Installation and Data Format
    ============================
    
    On Unix systems, type `make' to build the `svm-train' and `svm-predict'
    programs. Run them without arguments to show the usages of them.
    
    On other systems, consult `Makefile' to build them (e.g., see
    'Building Windows binaries' in this file) or use the pre-built
    binaries (Windows binaries are in the directory `windows').
    
    The format of training and testing data file is:
    
    <label> <index1>:<value1> <index2>:<value2> ...
    .
    .
    .
    
    Each line contains an instance and is ended by a '\n' character.  For
    classification, <label> is an integer indicating the class label
    (multi-class is supported). For regression, <label> is the target
    value which can be any real number. For one-class SVM, it's not used
    so can be any number.  The pair <index>:<value> gives a feature
    (attribute) value: <index> is an integer starting from 1 and <value>
    is a real number. The only exception is the precomputed kernel, where
    <index> starts from 0; see the section of precomputed kernels. Indices
    must be in ASCENDING order. Labels in the testing file are only used
    to calculate accuracy or errors. If they are unknown, just fill the
    first column with any numbers.
    
    A sample classification data included in this package is
    `heart_scale'. To check if your data is in a correct form, use
    `tools/checkdata.py' (details in `tools/README').
    
    Type `svm-train heart_scale', and the program will read the training
    data and output the model file `heart_scale.model'. If you have a test
    set called heart_scale.t, then type `svm-predict heart_scale.t
    heart_scale.model output' to see the prediction accuracy. The `output'
    file contains the predicted class labels.
    
    For classification, if training data are in only one class (i.e., all
    labels are the same), then `svm-train' issues a warning message:
    `Warning: training data in only one class. See README for details,'
    which means the training data is very unbalanced. The label in the
    training data is directly returned when testing.
    
    There are some other useful programs in this package.
    
    svm-scale:
    
    	This is a tool for scaling input data file.
    
    svm-toy:
    
    	This is a simple graphical interface which shows how SVM
    	separate data in a plane. You can click in the window to 
    	draw data points. Use "change" button to choose class 
    	1, 2 or 3 (i.e., up to three classes are supported), "load"
    	button to load data from a file, "save" button to save data to
    	a file, "run" button to obtain an SVM model, and "clear"
    	button to clear the window.
    
    	You can enter options in the bottom of the window, the syntax of
    	options is the same as `svm-train'.
    
    	Note that "load" and "save" consider dense data format both in
    	classification and the regression cases. For classification,
    	each data point has one label (the color) that must be 1, 2,
    	or 3 and two attributes (x-axis and y-axis values) in
    	[0,1). For regression, each data point has one target value
    	(y-axis) and one attribute (x-axis values) in [0, 1).
    
    	Type `make' in respective directories to build them.
    
    	You need Qt library to build the Qt version.
    	(available from http://www.trolltech.com)
    
    	You need GTK+ library to build the GTK version.
    	(available from http://www.gtk.org)
    	
    	The pre-built Windows binaries are in the `windows'
    	directory. We use Visual C++ on a 32-bit machine, so the
    	maximal cache size is 2GB.
    
    `svm-train' Usage
    =================
    
    Usage: svm-train [options] training_set_file [model_file]
    options:
    -s svm_type : set type of SVM (default 0)
    	0 -- C-SVC		(multi-class classification)
    	1 -- nu-SVC		(multi-class classification)
    	2 -- one-class SVM	
    	3 -- epsilon-SVR	(regression)
    	4 -- nu-SVR		(regression)
    -t kernel_type : set type of kernel function (default 2)
    	0 -- linear: u'*v
    	1 -- polynomial: (gamma*u'*v + coef0)^degree
    	2 -- radial basis function: exp(-gamma*|u-v|^2)
    	3 -- sigmoid: tanh(gamma*u'*v + coef0)
    	4 -- precomputed kernel (kernel values in training_set_file)
    -d degree : set degree in kernel function (default 3)
    -g gamma : set gamma in kernel function (default 1/num_features)
    -r coef0 : set coef0 in kernel function (default 0)
    -c cost : set the parameter C of C-SVC, epsilon-SVR, and nu-SVR (default 1)
    -n nu : set the parameter nu of nu-SVC, one-class SVM, and nu-SVR (default 0.5)
    -p epsilon : set the epsilon in loss function of epsilon-SVR (default 0.1)
    -m cachesize : set cache memory size in MB (default 100)
    -e epsilon : set tolerance of termination criterion (default 0.001)
    -h shrinking : whether to use the shrinking heuristics, 0 or 1 (default 1)
    -b probability_estimates : whether to train a SVC or SVR model for probability estimates, 0 or 1 (default 0)
    -wi weight : set the parameter C of class i to weight*C, for C-SVC (default 1)
    -v n: n-fold cross validation mode
    -q : quiet mode (no outputs)
    
    
    The k in the -g option means the number of attributes in the input data.
    
    option -v randomly splits the data into n parts and calculates cross
    validation accuracy/mean squared error on them.
    
    See libsvm FAQ for the meaning of outputs.
    
    `svm-predict' Usage
    ===================
    
    Usage: svm-predict [options] test_file model_file output_file
    options:
    -b probability_estimates: whether to predict probability estimates, 0 or 1 (default 0); for one-class SVM only 0 is supported
    
    model_file is the model file generated by svm-train.
    test_file is the test data you want to predict.
    svm-predict will produce output in the output_file.
    
    `svm-scale' Usage
    =================
    
    Usage: svm-scale [options] data_filename
    options:
    -l lower : x scaling lower limit (default -1)
    -u upper : x scaling upper limit (default +1)
    -y y_lower y_upper : y scaling limits (default: no y scaling)
    -s save_filename : save scaling parameters to save_filename
    -r restore_filename : restore scaling parameters from restore_filename
    
    See 'Examples' in this file for examples.
    
    Tips on Practical Use
    =====================
    
    * Scale your data. For example, scale each attribute to [0,1] or [-1,+1].
    * For C-SVC, consider using the model selection tool in the tools directory.
    * nu in nu-SVC/one-class-SVM/nu-SVR approximates the fraction of training
      errors and support vectors.
    * If data for classification are unbalanced (e.g. many positive and
      few negative), try different penalty parameters C by -wi (see
      examples below).
    * Specify larger cache size (i.e., larger -m) for huge problems.
    
    Examples
    ========
    
    > svm-scale -l -1 -u 1 -s range train > train.scale
    > svm-scale -r range test > test.scale
    
    Scale each feature of the training data to be in [-1,1]. Scaling
    factors are stored in the file range and then used for scaling the
    test data.
    
    > svm-train -s 0 -c 5 -t 2 -g 0.5 -e 0.1 data_file 
    
    Train a classifier with RBF kernel exp(-0.5|u-v|^2), C=10, and
    stopping tolerance 0.1.
    
    > svm-train -s 3 -p 0.1 -t 0 data_file
    
    Solve SVM regression with linear kernel u'v and epsilon=0.1
    in the loss function.
    
    > svm-train -c 10 -w1 1 -w-2 5 -w4 2 data_file
    
    Train a classifier with penalty 10 = 1 * 10 for class 1, penalty 50 =
    5 * 10 for class -2, and penalty 20 = 2 * 10 for class 4.
    
    > svm-train -s 0 -c 100 -g 0.1 -v 5 data_file
    
    Do five-fold cross validation for the classifier using
    the parameters C = 100 and gamma = 0.1
    
    > svm-train -s 0 -b 1 data_file
    > svm-predict -b 1 test_file data_file.model output_file
    
    Obtain a model with probability information and predict test data with
    probability estimates
    
    Precomputed Kernels 
    ===================
    
    Users may precompute kernel values and input them as training and
    testing files.  Then libsvm does not need the original
    training/testing sets.
    
    Assume there are L training instances x1, ..., xL and. 
    Let K(x, y) be the kernel
    value of two instances x and y. The input formats
    are:
    
    New training instance for xi:
    
    <label> 0:i 1:K(xi,x1) ... L:K(xi,xL) 
    
    New testing instance for any x:
    
    <label> 0:? 1:K(x,x1) ... L:K(x,xL) 
    
    That is, in the training file the first column must be the "ID" of
    xi. In testing, ? can be any value.
    
    All kernel values including ZEROs must be explicitly provided.  Any
    permutation or random subsets of the training/testing files are also
    valid (see examples below).
    
    Note: the format is slightly different from the precomputed kernel
    package released in libsvmtools earlier.
    
    Examples:
    
    	Assume the original training data has three four-feature
    	instances and testing data has one instance:
    
    	15  1:1 2:1 3:1 4:1
    	45      2:3     4:3
    	25          3:1
    
    	15  1:1     3:1
    
    	If the linear kernel is used, we have the following new
    	training/testing sets:
    
    	15  0:1 1:4 2:6  3:1
    	45  0:2 1:6 2:18 3:0 
    	25  0:3 1:1 2:0  3:1
     
    	15  0:? 1:2 2:0  3:1
    
    	? can be any value.
    
    	Any subset of the above training file is also valid. For example,
    
    	25  0:3 1:1 2:0  3:1
    	45  0:2 1:6 2:18 3:0 
    
    	implies that the kernel matrix is
    
    		[K(2,2) K(2,3)] = [18 0]
    		[K(3,2) K(3,3)] = [0  1]
    
    Library Usage
    =============
    
    These functions and structures are declared in the header file
    `svm.h'.  You need to #include "svm.h" in your C/C++ source files and
    link your program with `svm.cpp'. You can see `svm-train.c' and
    `svm-predict.c' for examples showing how to use them. We define
    LIBSVM_VERSION and declare `extern int libsvm_version; ' in svm.h, so
    you can check the version number.
    
    Before you classify test data, you need to construct an SVM model
    (`svm_model') using training data. A model can also be saved in
    a file for later use. Once an SVM model is available, you can use it
    to classify new data.
    
    - Function: struct svm_model *svm_train(const struct svm_problem *prob,
    					const struct svm_parameter *param);
    
        This function constructs and returns an SVM model according to
        the given training data and parameters.
    
        struct svm_problem describes the problem:
    	
    	struct svm_problem
    	{
    		int l;
    		double *y;
    		struct svm_node **x;
    	};
     
        where `l' is the number of training data, and `y' is an array containing
        their target values. (integers in classification, real numbers in
        regression) `x' is an array of pointers, each of which points to a sparse
        representation (array of svm_node) of one training vector. 
    
        For example, if we have the following training data:
    
        LABEL	ATTR1	ATTR2	ATTR3	ATTR4	ATTR5
        -----	-----	-----	-----	-----	-----
          1		  0	  0.1	  0.2	  0	  0
          2		  0	  0.1	  0.3	 -1.2	  0
          1		  0.4	  0	  0	  0	  0
          2		  0	  0.1	  0	  1.4	  0.5
          3		 -0.1	 -0.2	  0.1	  1.1	  0.1
    
        then the components of svm_problem are:
    
        l = 5
    
        y -> 1 2 1 2 3
    
        x -> [ ] -> (2,0.1) (3,0.2) (-1,?)
    	 [ ] -> (2,0.1) (3,0.3) (4,-1.2) (-1,?)
    	 [ ] -> (1,0.4) (-1,?)
    	 [ ] -> (2,0.1) (4,1.4) (5,0.5) (-1,?)
    	 [ ] -> (1,-0.1) (2,-0.2) (3,0.1) (4,1.1) (5,0.1) (-1,?)
    
        where (index,value) is stored in the structure `svm_node':
    
    	struct svm_node
    	{
    		int index;
    		double value;
    	};
    
        index = -1 indicates the end of one vector. Note that indices must
        be in ASCENDING order.
     
        struct svm_parameter describes the parameters of an SVM model:
    
    	struct svm_parameter
    	{
    		int svm_type;
    		int kernel_type;
    		int degree;	/* for poly */
    		double gamma;	/* for poly/rbf/sigmoid */
    		double coef0;	/* for poly/sigmoid */
    
    		/* these are for training only */
    		double cache_size; /* in MB */
    		double eps;	/* stopping criteria */
    		double C;	/* for C_SVC, EPSILON_SVR, and NU_SVR */
    		int nr_weight;		/* for C_SVC */
    		int *weight_label;	/* for C_SVC */
    		double* weight;		/* for C_SVC */
    		double nu;	/* for NU_SVC, ONE_CLASS, and NU_SVR */
    		double p;	/* for EPSILON_SVR */
    		int shrinking;	/* use the shrinking heuristics */
    		int probability; /* do probability estimates */
    	};
    
        svm_type can be one of C_SVC, NU_SVC, ONE_CLASS, EPSILON_SVR, NU_SVR.
    
        C_SVC:		C-SVM classification
        NU_SVC:		nu-SVM classification
        ONE_CLASS:		one-class-SVM
        EPSILON_SVR:	epsilon-SVM regression
        NU_SVR:		nu-SVM regression
    
        kernel_type can be one of LINEAR, POLY, RBF, SIGMOID.
    
        LINEAR:	u'*v
        POLY:	(gamma*u'*v + coef0)^degree
        RBF:	exp(-gamma*|u-v|^2)
        SIGMOID:	tanh(gamma*u'*v + coef0)
        PRECOMPUTED: kernel values in training_set_file
    
        cache_size is the size of the kernel cache, specified in megabytes.
        C is the cost of constraints violation. 
        eps is the stopping criterion. (we usually use 0.00001 in nu-SVC,
        0.001 in others). nu is the parameter in nu-SVM, nu-SVR, and
        one-class-SVM. p is the epsilon in epsilon-insensitive loss function
        of epsilon-SVM regression. shrinking = 1 means shrinking is conducted;
        = 0 otherwise. probability = 1 means model with probability
        information is obtained; = 0 otherwise.
    
        nr_weight, weight_label, and weight are used to change the penalty
        for some classes (If the weight for a class is not changed, it is
        set to 1). This is useful for training classifier using unbalanced
        input data or with asymmetric misclassification cost.
    
        nr_weight is the number of elements in the array weight_label and
        weight. Each weight[i] corresponds to weight_label[i], meaning that
        the penalty of class weight_label[i] is scaled by a factor of weight[i].
        
        If you do not want to change penalty for any of the classes,
        just set nr_weight to 0.
    
        *NOTE* Because svm_model contains pointers to svm_problem, you can
        not free the memory used by svm_problem if you are still using the
        svm_model produced by svm_train(). 
    
        *NOTE* To avoid wrong parameters, svm_check_parameter() should be
        called before svm_train().
    
        struct svm_model stores the model obtained from the training procedure.
        It is not recommended to directly access entries in this structure.
        Programmers should use the interface functions to get the values.
    
    	struct svm_model
    	{
    		struct svm_parameter param;	/* parameter */
    		int nr_class;		/* number of classes, = 2 in regression/one class svm */
    		int l;			/* total #SV */
    		struct svm_node **SV;		/* SVs (SV[l]) */
    		double **sv_coef;	/* coefficients for SVs in decision functions (sv_coef[k-1][l]) */
    		double *rho;		/* constants in decision functions (rho[k*(k-1)/2]) */
    		double *probA;		/* pairwise probability information */
    		double *probB;
    		int *sv_indices;        /* sv_indices[0,...,nSV-1] are values in [1,...,num_traning_data] to indicate SVs in the training set */
    
    		/* for classification only */
    
    		int *label;		/* label of each class (label[k]) */
    		int *nSV;		/* number of SVs for each class (nSV[k]) */
    					/* nSV[0] + nSV[1] + ... + nSV[k-1] = l */
    		/* XXX */
    		int free_sv;		/* 1 if svm_model is created by svm_load_model*/
    					/* 0 if svm_model is created by svm_train */
    	};
    
        param describes the parameters used to obtain the model.
    
        nr_class is the number of classes. It is 2 for regression and one-class SVM.
    
        l is the number of support vectors. SV and sv_coef are support
        vectors and the corresponding coefficients, respectively. Assume there are
        k classes. For data in class j, the corresponding sv_coef includes (k-1) y*alpha vectors,
        where alpha's are solutions of the following two class problems:
        1 vs j, 2 vs j, ..., j-1 vs j, j vs j+1, j vs j+2, ..., j vs k
        and y=1 for the first j-1 vectors, while y=-1 for the remaining k-j 
        vectors. For example, if there are 4 classes, sv_coef and SV are like:
    
            +-+-+-+--------------------+
            |1|1|1|                    |
            |v|v|v|  SVs from class 1  |
            |2|3|4|                    |
            +-+-+-+--------------------+
            |1|2|2|                    |
            |v|v|v|  SVs from class 2  |
            |2|3|4|                    |
            +-+-+-+--------------------+
            |1|2|3|                    |
            |v|v|v|  SVs from class 3  |
            |3|3|4|                    |
            +-+-+-+--------------------+
            |1|2|3|                    |
            |v|v|v|  SVs from class 4  |
            |4|4|4|                    |
            +-+-+-+--------------------+
    
        See svm_train() for an example of assigning values to sv_coef.
    
        rho is the bias term (-b). probA and probB are parameters used in
        probability outputs. If there are k classes, there are k*(k-1)/2
        binary problems as well as rho, probA, and probB values. They are
        aligned in the order of binary problems:
        1 vs 2, 1 vs 3, ..., 1 vs k, 2 vs 3, ..., 2 vs k, ..., k-1 vs k.
    
        sv_indices[0,...,nSV-1] are values in [1,...,num_traning_data] to
        indicate support vectors in the training set.
    
        label contains labels in the training data.
    
        nSV is the number of support vectors in each class.
    
        free_sv is a flag used to determine whether the space of SV should 
        be released in free_model_content(struct svm_model*) and 
        free_and_destroy_model(struct svm_model**). If the model is
        generated by svm_train(), then SV points to data in svm_problem
        and should not be removed. For example, free_sv is 0 if svm_model
        is created by svm_train, but is 1 if created by svm_load_model.
    
    - Function: double svm_predict(const struct svm_model *model,
                                   const struct svm_node *x);
    
        This function does classification or regression on a test vector x
        given a model.
    
        For a classification model, the predicted class for x is returned.
        For a regression model, the function value of x calculated using
        the model is returned. For an one-class model, +1 or -1 is
        returned.
    
    - Function: void svm_cross_validation(const struct svm_problem *prob,
    	const struct svm_parameter *param, int nr_fold, double *target);
    
        This function conducts cross validation. Data are separated to
        nr_fold folds. Under given parameters, sequentially each fold is
        validated using the model from training the remaining. Predicted
        labels (of all prob's instances) in the validation process are
        stored in the array called target.
    
        The format of svm_prob is same as that for svm_train(). 
    
    - Function: int svm_get_svm_type(const struct svm_model *model);
    
        This function gives svm_type of the model. Possible values of
        svm_type are defined in svm.h.
    
    - Function: int svm_get_nr_class(const svm_model *model);
    
        For a classification model, this function gives the number of
        classes. For a regression or an one-class model, 2 is returned.
    
    - Function: void svm_get_labels(const svm_model *model, int* label)
        
        For a classification model, this function outputs the name of
        labels into an array called label. For regression and one-class
        models, label is unchanged.
    
    - Function: void svm_get_sv_indices(const struct svm_model *model, int *sv_indices)
    
        This function outputs indices of support vectors into an array called sv_indices. 
        The size of sv_indices is the number of support vectors and can be obtained by calling svm_get_nr_sv. 
        Each sv_indices[i] is in the range of [1, ..., num_traning_data].
    
    - Function: int svm_get_nr_sv(const struct svm_model *model) 
    
        This function gives the number of total support vector.
    
    - Function: double svm_get_svr_probability(const struct svm_model *model);
    
        For a regression model with probability information, this function
        outputs a value sigma > 0. For test data, we consider the
        probability model: target value = predicted value + z, z: Laplace
        distribution e^(-|z|/sigma)/(2sigma)
    
        If the model is not for svr or does not contain required
        information, 0 is returned.
    
    - Function: double svm_predict_values(const svm_model *model, 
    				    const svm_node *x, double* dec_values)
    
        This function gives decision values on a test vector x given a
        model, and return the predicted label (classification) or
        the function value (regression).
    
        For a classification model with nr_class classes, this function
        gives nr_class*(nr_class-1)/2 decision values in the array
        dec_values, where nr_class can be obtained from the function
        svm_get_nr_class. The order is label[0] vs. label[1], ...,
        label[0] vs. label[nr_class-1], label[1] vs. label[2], ...,
        label[nr_class-2] vs. label[nr_class-1], where label can be
        obtained from the function svm_get_labels. The returned value is
        the predicted class for x. Note that when nr_class = 1, this 
        function does not give any decision value.
    
        For a regression model, dec_values[0] and the returned value are
        both the function value of x calculated using the model. For a
        one-class model, dec_values[0] is the decision value of x, while
        the returned value is +1/-1.
    
    - Function: double svm_predict_probability(const struct svm_model *model, 
    	    const struct svm_node *x, double* prob_estimates);
        
        This function does classification or regression on a test vector x
        given a model with probability information.
    
        For a classification model with probability information, this
        function gives nr_class probability estimates in the array
        prob_estimates. nr_class can be obtained from the function
        svm_get_nr_class. The class with the highest probability is
        returned. For regression/one-class SVM, the array prob_estimates
        is unchanged and the returned value is the same as that of
        svm_predict.
    
    - Function: const char *svm_check_parameter(const struct svm_problem *prob,
                                                const struct svm_parameter *param);
    
        This function checks whether the parameters are within the feasible
        range of the problem. This function should be called before calling
        svm_train() and svm_cross_validation(). It returns NULL if the
        parameters are feasible, otherwise an error message is returned.
    
    - Function: int svm_check_probability_model(const struct svm_model *model);
    
        This function checks whether the model contains required
        information to do probability estimates. If so, it returns
        +1. Otherwise, 0 is returned. This function should be called
        before calling svm_get_svr_probability and
        svm_predict_probability.
    
    - Function: int svm_save_model(const char *model_file_name,
    			       const struct svm_model *model);
    
        This function saves a model to a file; returns 0 on success, or -1
        if an error occurs.
    
    - Function: struct svm_model *svm_load_model(const char *model_file_name);
    
        This function returns a pointer to the model read from the file,
        or a null pointer if the model could not be loaded.
    
    - Function: void svm_free_model_content(struct svm_model *model_ptr);
    
        This function frees the memory used by the entries in a model structure.
    
    - Function: void svm_free_and_destroy_model(struct svm_model **model_ptr_ptr);
    
        This function frees the memory used by a model and destroys the model
        structure. It is equivalent to svm_destroy_model, which
        is deprecated after version 3.0.
    
    - Function: void svm_destroy_param(struct svm_parameter *param);
    
        This function frees the memory used by a parameter set.
    
    - Function: void svm_set_print_string_function(void (*print_func)(const char *));
    
        Users can specify their output format by a function. Use
            svm_set_print_string_function(NULL); 
        for default printing to stdout.
    
    Java Version
    ============
    
    The pre-compiled java class archive `libsvm.jar' and its source files are
    in the java directory. To run the programs, use
    
    java -classpath libsvm.jar svm_train <arguments>
    java -classpath libsvm.jar svm_predict <arguments>
    java -classpath libsvm.jar svm_toy
    java -classpath libsvm.jar svm_scale <arguments>
    
    Note that you need Java 1.5 (5.0) or above to run it.
    
    You may need to add Java runtime library (like classes.zip) to the classpath.
    You may need to increase maximum Java heap size.
    
    Library usages are similar to the C version. These functions are available:
    
    public class svm {
    	public static final int LIBSVM_VERSION=320; 
    	public static svm_model svm_train(svm_problem prob, svm_parameter param);
    	public static void svm_cross_validation(svm_problem prob, svm_parameter param, int nr_fold, double[] target);
    	public static int svm_get_svm_type(svm_model model);
    	public static int svm_get_nr_class(svm_model model);
    	public static void svm_get_labels(svm_model model, int[] label);
    	public static void svm_get_sv_indices(svm_model model, int[] indices);
    	public static int svm_get_nr_sv(svm_model model);
    	public static double svm_get_svr_probability(svm_model model);
    	public static double svm_predict_values(svm_model model, svm_node[] x, double[] dec_values);
    	public static double svm_predict(svm_model model, svm_node[] x);
    	public static double svm_predict_probability(svm_model model, svm_node[] x, double[] prob_estimates);
    	public static void svm_save_model(String model_file_name, svm_model model) throws IOException
    	public static svm_model svm_load_model(String model_file_name) throws IOException
    	public static String svm_check_parameter(svm_problem prob, svm_parameter param);
    	public static int svm_check_probability_model(svm_model model);
    	public static void svm_set_print_string_function(svm_print_interface print_func);
    }
    
    The library is in the "libsvm" package.
    Note that in Java version, svm_node[] is not ended with a node whose index = -1.
    
    Users can specify their output format by
    
    	your_print_func = new svm_print_interface()
    	{ 
    		public void print(String s)
    		{
    			// your own format
    		}
    	};
    	svm.svm_set_print_string_function(your_print_func);
    
    Building Windows Binaries
    =========================
    
    Windows binaries are in the directory `windows'. To build them via
    Visual C++, use the following steps:
    
    1. Open a DOS command box (or Visual Studio Command Prompt) and change
    to libsvm directory. If environment variables of VC++ have not been
    set, type
    
    "C:\Program Files\Microsoft Visual Studio 10.0\VC\bin\vcvars32.bat"
    
    You may have to modify the above command according which version of
    VC++ or where it is installed.
    
    2. Type
    
    nmake -f Makefile.win clean all
    
    3. (optional) To build shared library libsvm.dll, type
    
    nmake -f Makefile.win lib
    
    4. (optional) To build 64-bit windows binaries, you must
    	(1) Run vcvars64.bat instead of vcvars32.bat. Note that 
    	vcvars64.bat is located at "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\bin\amd64\"
    	(2) Change CFLAGS in Makefile.win: /D _WIN32 to /D _WIN64	
    	
    Another way is to build them from Visual C++ environment. See details
    in libsvm FAQ.
    
    - Additional Tools: Sub-sampling, Parameter Selection, Format checking, etc.
    ============================================================================
    
    See the README file in the tools directory.
    
    MATLAB/OCTAVE Interface
    =======================
    
    Please check the file README in the directory `matlab'.
    
    Python Interface
    ================
    
    See the README file in python directory.
    
    Additional Information
    ======================
    
    If you find LIBSVM helpful, please cite it as
    
    Chih-Chung Chang and Chih-Jen Lin, LIBSVM : a library for support
    vector machines. ACM Transactions on Intelligent Systems and
    Technology, 2:27:1--27:27, 2011. Software available at
    http://www.csie.ntu.edu.tw/~cjlin/libsvm
    
    LIBSVM implementation document is available at
    http://www.csie.ntu.edu.tw/~cjlin/papers/libsvm.pdf
    
    For any questions and comments, please email cjlin@csie.ntu.edu.tw
    
    Acknowledgments:
    This work was supported in part by the National Science 
    Council of Taiwan via the grant NSC 89-2213-E-002-013.
    The authors thank their group members and users
    for many helpful discussions and comments. They are listed in
    http://www.csie.ntu.edu.tw/~cjlin/libsvm/acknowledgements
    
    

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