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#include <iostream>
#include "crfpp.h"
// c++ -O3 example.cpp -lcrfpp
int main(int argc, char **argv) {
// -v 3: access deep information like alpha,beta,prob
// -nN: enable nbest output. N should be >= 2
CRFPP::Tagger *tagger =
CRFPP::createTagger("-m model -v 3 -n2");
if (!tagger) {
std::cerr << CRFPP::getTaggerError() << std::endl;
return -1;
}
// clear internal context
tagger->clear();
// add context
tagger->add("Confidence NN");
tagger->add("in IN");
tagger->add("the DT");
tagger->add("pound NN");
tagger->add("is VBZ");
tagger->add("widely RB");
tagger->add("expected VBN");
tagger->add("to TO");
tagger->add("take VB");
tagger->add("another DT");
tagger->add("sharp JJ");
tagger->add("dive NN");
tagger->add("if IN");
tagger->add("trade NN");
tagger->add("figures NNS");
tagger->add("for IN");
tagger->add("September NNP");
std::cout << "column size: " << tagger->xsize() << std::endl;
std::cout << "token size: " << tagger->size() << std::endl;
std::cout << "tag size: " << tagger->ysize() << std::endl;
std::cout << "tagset information:" << std::endl;
for (size_t i = 0; i < tagger->ysize(); ++i) {
std::cout << "tag " << i << " " << tagger->yname(i) << std::endl;
}
// parse and change internal stated as 'parsed'
if (! tagger->parse()) return -1;
std::cout << "conditional prob=" << tagger->prob()
<< " log(Z)=" << tagger->Z() << std::endl;
for (size_t i = 0; i < tagger->size(); ++i) {
for (size_t j = 0; j < tagger->xsize(); ++j) {
std::cout << tagger->x(i, j) << '\t';
}
std::cout << tagger->y2(i) << '\t';
std::cout << std::endl;
std::cout << "Details";
for (size_t j = 0; j < tagger->ysize(); ++j) {
std::cout << '\t' << tagger->yname(j) << "/prob=" << tagger->prob(i,j)
<< "/alpha=" << tagger->alpha(i, j)
<< "/beta=" << tagger->beta(i, j);
}
std::cout << std::endl;
}
// when -n20 is specified, you can access nbest outputs
std::cout << "nbest outputs:" << std::endl;
for (size_t n = 0; n < 10; ++n) {
if (! tagger->next()) break;
std::cout << "nbest n=" << n << "\tconditional prob=" << tagger->prob() << std::endl;
// you can access any information using tagger->y()...
}
std::cout << "Done" << std::endl;
delete tagger;
return 0;
}
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