namedlabels Class Reference

#include <global_data.h>

Public Member Functions
	namedlabels (std::string label_list)
	~namedlabels ()
uint32_t	getK ()
uint64_t	get (substring &s)
substring	get (uint32_t v)

Private Attributes
std::vector< substring >	id2name
v_hashmap< substring, uint64_t >	name2id
uint32_t	K

Detailed Description

Definition at line 64 of file global_data.h.

Constructor & Destructor Documentation

namedlabels()

namedlabels::namedlabels ( std::string  label_list )

inline

Definition at line 72 of file global_data.h.

References substring::begin, v_hashmap< K, V >::delete_v(), substring::end, v_hashmap< K, V >::get(), v_hashmap< K, V >::init(), v_hashmap< K, V >::put(), substring_equal(), THROW, tokenize(), and uniform_hash().

  {
    char* temp = calloc_or_throw<char>(1 + label_list.length());
    memcpy(temp, label_list.c_str(), strlen(label_list.c_str()));
    substring ss = {temp, nullptr};
    ss.end = ss.begin + label_list.length();
    tokenize(',', ss, id2name);

    K = (uint32_t)id2name.size();
    name2id.delete_v();  // delete automatically allocated vector.
    name2id.init(4 * K + 1, 0, substring_equal);
    for (size_t k = 0; k < K; k++)
    {
      substring& l = id2name[k];
      uint64_t hash = uniform_hash((unsigned char*)l.begin, l.end - l.begin, 378401);
      uint64_t id = name2id.get(l, hash);
      if (id != 0)  // TODO: memory leak: char* temp
        THROW("error: label dictionary initialized with multiple occurances of: " << l);
      size_t len = l.end - l.begin;
      substring l_copy = {calloc_or_throw<char>(len), nullptr};
      memcpy(l_copy.begin, l.begin, len * sizeof(char));
      l_copy.end = l_copy.begin + len;
      name2id.put(l_copy, hash, k + 1);
    }
  }

~namedlabels()

namedlabels::~namedlabels ( )

inline

Definition at line 98 of file global_data.h.

References v_hashmap< K, V >::delete_v(), deleter(), and v_hashmap< K, V >::iter().

Referenced by VW::finish().

  {
    if (id2name.size() > 0)
      free(id2name[0].begin);
    name2id.iter(deleter);
    name2id.delete_v();
  }

Member Function Documentation

get() [1/2]

uint64_t namedlabels::get ( substring &  s )

inline

Definition at line 108 of file global_data.h.

References c, v_hashmap< K, V >::get(), and uniform_hash().

Referenced by MULTICLASS::finish_example(), finish_example_scores(), COST_SENSITIVE::output_example(), MULTICLASS::parse_label(), COST_SENSITIVE::parse_label(), Search::search::pretty_label(), MULTICLASS::print_label_pred(), and COST_SENSITIVE::print_update().

  {
    uint64_t hash = uniform_hash((unsigned char*)s.begin, s.end - s.begin, 378401);
    uint64_t v = name2id.get(s, hash);
    if (v == 0)
    {
      std::cerr << "warning: missing named label '";
      for (char* c = s.begin; c != s.end; c++) std::cerr << *c;
      std::cerr << '\'' << std::endl;
    }
    return v;
  }

get() [2/2]

substring namedlabels::get ( uint32_t  v )

inline

Definition at line 121 of file global_data.h.

  {
    if ((v == 0) || (v > K))
    {
      substring ss = {nullptr, nullptr};
      return ss;
    }
    else
      return id2name[v - 1];
  }

getK()

uint32_t namedlabels::getK ( )

inline

Definition at line 106 of file global_data.h.

Referenced by oaa_setup(), and parse_example_tweaks().

{ return K; }

Member Data Documentation

id2name

std::vector<substring> namedlabels::id2name

private

Definition at line 67 of file global_data.h.

K

uint32_t namedlabels::K

private

Definition at line 69 of file global_data.h.

name2id

v_hashmap<substring, uint64_t> namedlabels::name2id

private

Definition at line 68 of file global_data.h.

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The documentation for this class was generated from the following file:

• /mnt/c/w/linux/vowpal_wabbit/vowpalwabbit/global_data.h