vowpalwabbit/binary.cc


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#include "oaa.h"
#include "vw.h"

using namespace LEARNER;

namespace BINARY {

  template <bool is_learn>
  void predict_or_learn(void* d, learner& base, example* ec) {
    if (is_learn)
      base.learn(ec);
    else
      base.predict(ec);

    if ( ec->final_prediction > 0)
      ec->final_prediction = 1;
    else
      ec->final_prediction = -1;

    label_data* ld = (label_data*)ec->ld;//New loss
    if (ld->label == ec->final_prediction)
      ec->loss = 0.;
    else
      ec->loss = 1.;
  }

  learner* setup(vw& all, std::vector<std::string>&opts, po::variables_map& vm, po::variables_map& vm_file)
  {//parse and set arguments
    if (!vm_file.count("binary"))
      {
	std::stringstream ss;
	ss << " --binary ";
	all.options_from_file.append(ss.str());
      }

    all.sd->binary_label = true;
    //Create new learner
    learner* ret = new learner(NULL, all.l);
    ret->set_learn<void, predict_or_learn<true> >();
    ret->set_predict<void, predict_or_learn<false> >();
    return ret;
  }
}