cost_sensitive.h

/*
Copyright (c) by respective owners including Yahoo!, Microsoft, and
individual contributors. All rights reserved.  Released under a BSD
license as described in the file LICENSE.
 */
#pragma once
#include "label_parser.h"

struct example;
struct vw;

namespace COST_SENSITIVE {
  struct wclass {
    float x;
    uint32_t class_index;
    float partial_prediction;  // a partial prediction: new!
    float wap_value;  // used for wap to store values derived from costs
    bool operator==(wclass j){return class_index == j.class_index;}
  };
/* if class_index > 0, then this this a "normal" example
   if class_index == 0, then:
     if x == -FLT_MAX then this is a 'shared' example
     if x > 0 then this is a label feature vector for (size_t)x
*/

  struct label {
    v_array<wclass> costs;
  };
  
  void output_example(vw& all, example& ec);
  extern label_parser cs_label;

  bool example_is_test(example& ec);

  void print_update(vw& all, bool is_test, example& ec, const v_array<example*> *ec_seq, bool multilabel = false);
  bool ec_is_example_header(example& ec);  // example headers look like "0:-1" or just "shared"
}