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New translations svmtrain.c (French)

l10n_v0.2.x
linlin 5 years ago
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      lang/fr/gklearn/gedlib/lib/libsvm.3.22/matlab/svmtrain.c

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lang/fr/gklearn/gedlib/lib/libsvm.3.22/matlab/svmtrain.c View File

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "svm.h"

#include "mex.h"
#include "svm_model_matlab.h"

#ifdef MX_API_VER
#if MX_API_VER < 0x07030000
typedef int mwIndex;
#endif
#endif

#define CMD_LEN 2048
#define Malloc(type,n) (type *)malloc((n)*sizeof(type))

void print_null(const char *s) {}
void print_string_matlab(const char *s) {mexPrintf(s);}

void exit_with_help()
{
mexPrintf(
"Usage: model = svmtrain(training_label_vector, training_instance_matrix, 'libsvm_options');\n"
"libsvm_options:\n"
"-s svm_type : set type of SVM (default 0)\n"
" 0 -- C-SVC (multi-class classification)\n"
" 1 -- nu-SVC (multi-class classification)\n"
" 2 -- one-class SVM\n"
" 3 -- epsilon-SVR (regression)\n"
" 4 -- nu-SVR (regression)\n"
"-t kernel_type : set type of kernel function (default 2)\n"
" 0 -- linear: u'*v\n"
" 1 -- polynomial: (gamma*u'*v + coef0)^degree\n"
" 2 -- radial basis function: exp(-gamma*|u-v|^2)\n"
" 3 -- sigmoid: tanh(gamma*u'*v + coef0)\n"
" 4 -- precomputed kernel (kernel values in training_instance_matrix)\n"
"-d degree : set degree in kernel function (default 3)\n"
"-g gamma : set gamma in kernel function (default 1/num_features)\n"
"-r coef0 : set coef0 in kernel function (default 0)\n"
"-c cost : set the parameter C of C-SVC, epsilon-SVR, and nu-SVR (default 1)\n"
"-n nu : set the parameter nu of nu-SVC, one-class SVM, and nu-SVR (default 0.5)\n"
"-p epsilon : set the epsilon in loss function of epsilon-SVR (default 0.1)\n"
"-m cachesize : set cache memory size in MB (default 100)\n"
"-e epsilon : set tolerance of termination criterion (default 0.001)\n"
"-h shrinking : whether to use the shrinking heuristics, 0 or 1 (default 1)\n"
"-b probability_estimates : whether to train a SVC or SVR model for probability estimates, 0 or 1 (default 0)\n"
"-wi weight : set the parameter C of class i to weight*C, for C-SVC (default 1)\n"
"-v n : n-fold cross validation mode\n"
"-q : quiet mode (no outputs)\n"
);
}

// svm arguments
struct svm_parameter param; // set by parse_command_line
struct svm_problem prob; // set by read_problem
struct svm_model *model;
struct svm_node *x_space;
int cross_validation;
int nr_fold;


double do_cross_validation()
{
int i;
int total_correct = 0;
double total_error = 0;
double sumv = 0, sumy = 0, sumvv = 0, sumyy = 0, sumvy = 0;
double *target = Malloc(double,prob.l);
double retval = 0.0;

svm_cross_validation(&prob,&param,nr_fold,target);
if(param.svm_type == EPSILON_SVR ||
param.svm_type == NU_SVR)
{
for(i=0;i<prob.l;i++)
{
double y = prob.y[i];
double v = target[i];
total_error += (v-y)*(v-y);
sumv += v;
sumy += y;
sumvv += v*v;
sumyy += y*y;
sumvy += v*y;
}
mexPrintf("Cross Validation Mean squared error = %g\n",total_error/prob.l);
mexPrintf("Cross Validation Squared correlation coefficient = %g\n",
((prob.l*sumvy-sumv*sumy)*(prob.l*sumvy-sumv*sumy))/
((prob.l*sumvv-sumv*sumv)*(prob.l*sumyy-sumy*sumy))
);
retval = total_error/prob.l;
}
else
{
for(i=0;i<prob.l;i++)
if(target[i] == prob.y[i])
++total_correct;
mexPrintf("Cross Validation Accuracy = %g%%\n",100.0*total_correct/prob.l);
retval = 100.0*total_correct/prob.l;
}
free(target);
return retval;
}

// nrhs should be 3
int parse_command_line(int nrhs, const mxArray *prhs[], char *model_file_name)
{
int i, argc = 1;
char cmd[CMD_LEN];
char *argv[CMD_LEN/2];
void (*print_func)(const char *) = print_string_matlab; // default printing to matlab display

// default values
param.svm_type = C_SVC;
param.kernel_type = RBF;
param.degree = 3;
param.gamma = 0; // 1/num_features
param.coef0 = 0;
param.nu = 0.5;
param.cache_size = 100;
param.C = 1;
param.eps = 1e-3;
param.p = 0.1;
param.shrinking = 1;
param.probability = 0;
param.nr_weight = 0;
param.weight_label = NULL;
param.weight = NULL;
cross_validation = 0;

if(nrhs <= 1)
return 1;

if(nrhs > 2)
{
// put options in argv[]
mxGetString(prhs[2], cmd, mxGetN(prhs[2]) + 1);
if((argv[argc] = strtok(cmd, " ")) != NULL)
while((argv[++argc] = strtok(NULL, " ")) != NULL)
;
}

// parse options
for(i=1;i<argc;i++)
{
if(argv[i][0] != '-') break;
++i;
if(i>=argc && argv[i-1][1] != 'q') // since option -q has no parameter
return 1;
switch(argv[i-1][1])
{
case 's':
param.svm_type = atoi(argv[i]);
break;
case 't':
param.kernel_type = atoi(argv[i]);
break;
case 'd':
param.degree = atoi(argv[i]);
break;
case 'g':
param.gamma = atof(argv[i]);
break;
case 'r':
param.coef0 = atof(argv[i]);
break;
case 'n':
param.nu = atof(argv[i]);
break;
case 'm':
param.cache_size = atof(argv[i]);
break;
case 'c':
param.C = atof(argv[i]);
break;
case 'e':
param.eps = atof(argv[i]);
break;
case 'p':
param.p = atof(argv[i]);
break;
case 'h':
param.shrinking = atoi(argv[i]);
break;
case 'b':
param.probability = atoi(argv[i]);
break;
case 'q':
print_func = &print_null;
i--;
break;
case 'v':
cross_validation = 1;
nr_fold = atoi(argv[i]);
if(nr_fold < 2)
{
mexPrintf("n-fold cross validation: n must >= 2\n");
return 1;
}
break;
case 'w':
++param.nr_weight;
param.weight_label = (int *)realloc(param.weight_label,sizeof(int)*param.nr_weight);
param.weight = (double *)realloc(param.weight,sizeof(double)*param.nr_weight);
param.weight_label[param.nr_weight-1] = atoi(&argv[i-1][2]);
param.weight[param.nr_weight-1] = atof(argv[i]);
break;
default:
mexPrintf("Unknown option -%c\n", argv[i-1][1]);
return 1;
}
}

svm_set_print_string_function(print_func);

return 0;
}

// read in a problem (in svmlight format)
int read_problem_dense(const mxArray *label_vec, const mxArray *instance_mat)
{
// using size_t due to the output type of matlab functions
size_t i, j, k, l;
size_t elements, max_index, sc, label_vector_row_num;
double *samples, *labels;

prob.x = NULL;
prob.y = NULL;
x_space = NULL;

labels = mxGetPr(label_vec);
samples = mxGetPr(instance_mat);
sc = mxGetN(instance_mat);

elements = 0;
// number of instances
l = mxGetM(instance_mat);
label_vector_row_num = mxGetM(label_vec);
prob.l = (int)l;

if(label_vector_row_num!=l)
{
mexPrintf("Length of label vector does not match # of instances.\n");
return -1;
}

if(param.kernel_type == PRECOMPUTED)
elements = l * (sc + 1);
else
{
for(i = 0; i < l; i++)
{
for(k = 0; k < sc; k++)
if(samples[k * l + i] != 0)
elements++;
// count the '-1' element
elements++;
}
}

prob.y = Malloc(double,l);
prob.x = Malloc(struct svm_node *,l);
x_space = Malloc(struct svm_node, elements);

max_index = sc;
j = 0;
for(i = 0; i < l; i++)
{
prob.x[i] = &x_space[j];
prob.y[i] = labels[i];

for(k = 0; k < sc; k++)
{
if(param.kernel_type == PRECOMPUTED || samples[k * l + i] != 0)
{
x_space[j].index = (int)k + 1;
x_space[j].value = samples[k * l + i];
j++;
}
}
x_space[j++].index = -1;
}

if(param.gamma == 0 && max_index > 0)
param.gamma = (double)(1.0/max_index);

if(param.kernel_type == PRECOMPUTED)
for(i=0;i<l;i++)
{
if((int)prob.x[i][0].value <= 0 || (int)prob.x[i][0].value > (int)max_index)
{
mexPrintf("Wrong input format: sample_serial_number out of range\n");
return -1;
}
}

return 0;
}

int read_problem_sparse(const mxArray *label_vec, const mxArray *instance_mat)
{
mwIndex *ir, *jc, low, high, k;
// using size_t due to the output type of matlab functions
size_t i, j, l, elements, max_index, label_vector_row_num;
mwSize num_samples;
double *samples, *labels;
mxArray *instance_mat_col; // transposed instance sparse matrix

prob.x = NULL;
prob.y = NULL;
x_space = NULL;

// transpose instance matrix
{
mxArray *prhs[1], *plhs[1];
prhs[0] = mxDuplicateArray(instance_mat);
if(mexCallMATLAB(1, plhs, 1, prhs, "transpose"))
{
mexPrintf("Error: cannot transpose training instance matrix\n");
return -1;
}
instance_mat_col = plhs[0];
mxDestroyArray(prhs[0]);
}

// each column is one instance
labels = mxGetPr(label_vec);
samples = mxGetPr(instance_mat_col);
ir = mxGetIr(instance_mat_col);
jc = mxGetJc(instance_mat_col);

num_samples = mxGetNzmax(instance_mat_col);

// number of instances
l = mxGetN(instance_mat_col);
label_vector_row_num = mxGetM(label_vec);
prob.l = (int) l;

if(label_vector_row_num!=l)
{
mexPrintf("Length of label vector does not match # of instances.\n");
return -1;
}

elements = num_samples + l;
max_index = mxGetM(instance_mat_col);

prob.y = Malloc(double,l);
prob.x = Malloc(struct svm_node *,l);
x_space = Malloc(struct svm_node, elements);

j = 0;
for(i=0;i<l;i++)
{
prob.x[i] = &x_space[j];
prob.y[i] = labels[i];
low = jc[i], high = jc[i+1];
for(k=low;k<high;k++)
{
x_space[j].index = (int)ir[k] + 1;
x_space[j].value = samples[k];
j++;
}
x_space[j++].index = -1;
}

if(param.gamma == 0 && max_index > 0)
param.gamma = (double)(1.0/max_index);

return 0;
}

static void fake_answer(int nlhs, mxArray *plhs[])
{
int i;
for(i=0;i<nlhs;i++)
plhs[i] = mxCreateDoubleMatrix(0, 0, mxREAL);
}

// Interface function of matlab
// now assume prhs[0]: label prhs[1]: features
void mexFunction( int nlhs, mxArray *plhs[],
int nrhs, const mxArray *prhs[] )
{
const char *error_msg;

// fix random seed to have same results for each run
// (for cross validation and probability estimation)
srand(1);

if(nlhs > 1)
{
exit_with_help();
fake_answer(nlhs, plhs);
return;
}

// Transform the input Matrix to libsvm format
if(nrhs > 1 && nrhs < 4)
{
int err;

if(!mxIsDouble(prhs[0]) || !mxIsDouble(prhs[1]))
{
mexPrintf("Error: label vector and instance matrix must be double\n");
fake_answer(nlhs, plhs);
return;
}

if(mxIsSparse(prhs[0]))
{
mexPrintf("Error: label vector should not be in sparse format\n");
fake_answer(nlhs, plhs);
return;
}

if(parse_command_line(nrhs, prhs, NULL))
{
exit_with_help();
svm_destroy_param(&param);
fake_answer(nlhs, plhs);
return;
}

if(mxIsSparse(prhs[1]))
{
if(param.kernel_type == PRECOMPUTED)
{
// precomputed kernel requires dense matrix, so we make one
mxArray *rhs[1], *lhs[1];

rhs[0] = mxDuplicateArray(prhs[1]);
if(mexCallMATLAB(1, lhs, 1, rhs, "full"))
{
mexPrintf("Error: cannot generate a full training instance matrix\n");
svm_destroy_param(&param);
fake_answer(nlhs, plhs);
return;
}
err = read_problem_dense(prhs[0], lhs[0]);
mxDestroyArray(lhs[0]);
mxDestroyArray(rhs[0]);
}
else
err = read_problem_sparse(prhs[0], prhs[1]);
}
else
err = read_problem_dense(prhs[0], prhs[1]);

// svmtrain's original code
error_msg = svm_check_parameter(&prob, &param);

if(err || error_msg)
{
if (error_msg != NULL)
mexPrintf("Error: %s\n", error_msg);
svm_destroy_param(&param);
free(prob.y);
free(prob.x);
free(x_space);
fake_answer(nlhs, plhs);
return;
}

if(cross_validation)
{
double *ptr;
plhs[0] = mxCreateDoubleMatrix(1, 1, mxREAL);
ptr = mxGetPr(plhs[0]);
ptr[0] = do_cross_validation();
}
else
{
int nr_feat = (int)mxGetN(prhs[1]);
const char *error_msg;
model = svm_train(&prob, &param);
error_msg = model_to_matlab_structure(plhs, nr_feat, model);
if(error_msg)
mexPrintf("Error: can't convert libsvm model to matrix structure: %s\n", error_msg);
svm_free_and_destroy_model(&model);
}
svm_destroy_param(&param);
free(prob.y);
free(prob.x);
free(x_space);
}
else
{
exit_with_help();
fake_answer(nlhs, plhs);
return;
}
}

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