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library_example.cc
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library_example.cc
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#include <stdio.h>
#include "../vowpalwabbit/parser.h"
#include "../vowpalwabbit/vw.h"
inline feature vw_feature_from_string(VW::workspace& v, std::string fstr, unsigned long seed, float val)
{ auto foo = VW::hash_feature(v, fstr, seed);
feature f = { val, foo};
return f;
}
int main(int argc, char *argv[])
{
VW::workspace* model = VW::initialize("--hash all -q st --noconstant -f train2.vw --no_stdin");
VW::example* vec2 = VW::read_example(*model, (char*)"|s p^the_man w^the w^man |t p^un_homme w^un w^homme");
model->learn(*vec2);
std::cerr << "p2 = " << vec2->pred.scalar << std::endl;
VW::finish_example(*model, *vec2);
VW::primitive_feature_space features[2];
VW::primitive_feature_space *s = features, *t = features + 1;
s->name = 's';
t->name = 't';
uint32_t s_hash = static_cast<uint32_t>(VW::hash_space(*model, "s"));
uint32_t t_hash = static_cast<uint32_t>(VW::hash_space(*model, "t"));
s->fs = new feature[3];
s->len = 3;
t->fs = new feature[3];
t->len = 3;
s->fs[0] = vw_feature_from_string(*model, "p^the_man", s_hash, 1.0);
s->fs[1] = vw_feature_from_string(*model, "w^the", s_hash, 1.0);
s->fs[2] = vw_feature_from_string(*model, "w^man", s_hash, 1.0);
t->fs[0] = vw_feature_from_string(*model, "p^le_homme", t_hash, 1.0);
t->fs[1] = vw_feature_from_string(*model, "w^le", t_hash, 1.0);
t->fs[2] = vw_feature_from_string(*model, "w^homme", t_hash, 1.0);
VW::example* vec3 = VW::import_example(*model, "", features, 2);
model->learn(*vec3);
std::cerr << "p3 = " << vec3->pred.scalar << std::endl;
// TODO: this does not invoke m_vw->l->finish_example()
VW::finish_example(*model, *vec3);
VW::finish(*model);
VW::workspace* model2 = VW::initialize("--hash all -q st --noconstant -i train2.vw --no_stdin");
vec2 = VW::read_example(*model2, (char*)" |s p^the_man w^the w^man |t p^un_homme w^un w^homme");
model2->learn(*vec2);
std::cerr << "p4 = " << vec2->pred.scalar << std::endl;
size_t len=0;
VW::primitive_feature_space* pfs = VW::export_example(*model2, vec2, len);
for (size_t i = 0; i < len; i++)
{ std::cout << "namespace = " << pfs[i].name;
for (size_t j = 0; j < pfs[i].len; j++)
{
std::cout << " " << pfs[i].fs[j].weight_index << ":" << pfs[i].fs[j].x << ":"
<< VW::get_weight(*model2, static_cast<uint32_t>(pfs[i].fs[j].weight_index), 0);
}
std::cout << std::endl;
}
VW::finish_example(*model2, *vec2);
VW::finish(*model2);
}