CRF++0.54工具包

#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; }