// Sorts the vocabulary by frequency using word counts, frequent->infrequent
void Vocabulary::sortVocab()
{
int a, size;
unsigned int hash;
// Sort the vocabulary and keep </s> at the first position
qsort(&m_vocab[1], m_vocab_size - 1, sizeof(struct vocab_word_t), vocabCompare);
//reduce words and re-hash
for (a = 0; a < vocab_hash_size; a++) m_vocab_hash[a] = -1;
size = m_vocab_size;
m_train_words = 0;
for (a = 0; a < size; a++)
{
// Words occuring less than min_count times will be discarded from the vocab
if (m_vocab[a].cn < m_min_count)
{
m_vocab_size--;
free(m_vocab[m_vocab_size].word);
m_vocab[m_vocab_size].word = NULL;
}
else
{
// Hash will be re-computed, as after the sorting it is not actual
hash = getWordHash(m_vocab[a].word);
while (m_vocab_hash[hash] != -1) hash = (hash + 1) % vocab_hash_size;
m_vocab_hash[hash] = a;
m_train_words += m_vocab[a].cn;
}
}
m_train_words -= m_vocab[0].cn; //exclude <s>
m_vocab = (struct vocab_word_t *)realloc(m_vocab, (m_vocab_size + 1) * sizeof(struct vocab_word_t));
}
void sortVocab(){
int a, size;
unsigned int hash;
//doesn't use </s>
qsort(vocab, vocab_size, sizeof(vocabWord), VocabCompare);
for(a=0;a<hash_size;a++){
vocab_hash[a] = -1;
}
size = vocab_size;
train_words=0;
for(a=0;a<size;a++){
if(vocab[a].cn < min_count){
vocab_size--;
free(vocab[a].word);
vocab[a].word = (char*)0;
}
else{
hash = getWordHash(vocab[a].word);
while(vocab_hash[hash] != -1){
vocab_hash[hash] = a;
train_words += vocab[a].cn;
}
}
}
for(a=0;a<vocab_size;a++){
vocab[a].code = (char*) calloc(MAX_CODE_LENGTH, sizeof(char));
vocab[a].point = (int*) calloc(MAX_CODE_LENGTH, sizeof(int));
}
}
int addtoCurrentVocab(char word[]){
unsigned int hash;
unsigned int length = strlen(word) + 1;
vocab[vocab_size].word = (char*) calloc(length, sizeof(char));
strcpy(vocab[vocab_size].word, word);
vocab[vocab_size].cn = 0;
vocab_size++;
hash = getWordHash(word);
vocab_hash[hash] = vocab_size - 1;
return vocab_size - 1;
}
// Returns position of a word in the vocabulary; if the word is not found, returns -1
long long Vocabulary::searchVocab(const char *word)
{
unsigned int hash = getWordHash(word);
while (1)
{
if (m_vocab_hash[hash] == -1 || m_vocab[m_vocab_hash[hash]].word == NULL) return -1;
if (!strcmp(word, m_vocab[m_vocab_hash[hash]].word)) return m_vocab_hash[hash];
hash = (hash + 1) % vocab_hash_size;
}
return -1;
}
/* Returns position of a word in the vocabulary; if the word is not found,
* returns -1 */
int distance::searchVocab(char *word)
{
unsigned int hash = getWordHash(word);
int l_b;
while (1)
{
if (vocab_hash[hash] == -1) return -1;
// if (!strcmp(word, vocab[vocab_hash[hash]].word)) return vocab_hash[hash];
l_b = vocab_hash[hash];
if (!strcmp(&vocab[l_b * max_w], word)) return vocab_hash[hash];
hash = (hash + 1) % vocab_hash_size;
}
return -1;
}
int searchCurrentVocab(char word[]){ //uses linear probing approach for hash table
unsigned int i;
unsigned int hash = getWordHash(word);
for(i = hash; 1; i = (i+1) % hash_size){
if(vocab_hash[i] == -1){
return -1;
}
if(!strcmp(word, vocab[vocab_hash[i]].word)){
return vocab_hash[i];
}
}
//shouldn't reach here ever
return -1;
}
long long Vocabulary::addWordToVocab(const char *word)
{
unsigned int hash, length = strlen(word) + 1;
if (length > MAX_STRING) length = MAX_STRING;
m_vocab[m_vocab_size].word = (char *)calloc(length, sizeof(char));
strcpy(m_vocab[m_vocab_size].word, word);
m_vocab[m_vocab_size].cn = 0;
m_vocab_size++;
// Reallocate memory if needed
if (m_vocab_size + 2 >= m_vocab_capacity)
{
m_vocab_capacity += 1000;
m_vocab = (struct vocab_word_t *)realloc(m_vocab, m_vocab_capacity * sizeof(struct vocab_word_t));
}
hash = getWordHash(word);
while (m_vocab_hash[hash] != -1) hash = (hash + 1) % vocab_hash_size;
m_vocab_hash[hash] = m_vocab_size - 1;
return m_vocab_size - 1;
}
// Reduces the vocabulary by removing infrequent tokens
void Vocabulary::reduceVocab()
{
int a, b = 0;
unsigned int hash;
for (a = 0; a < m_vocab_size; a++) if (m_vocab[a].cn > m_min_reduce)
{
m_vocab[b].cn = m_vocab[a].cn;
m_vocab[b].word = m_vocab[a].word;
b++;
} else free(m_vocab[a].word);
m_vocab_size = b;
for (a = 0; a < vocab_hash_size; a++) m_vocab_hash[a] = -1;
for (a = 0; a < m_vocab_size; a++)
{
// Hash will be re-computed, as it is not actual
hash = getWordHash(m_vocab[a].word);
while (m_vocab_hash[hash] != -1) hash = (hash + 1) % vocab_hash_size;
m_vocab_hash[hash] = a;
}
fflush(stdout);
m_min_reduce++;
}
/* Adds a word to the vocabulary */
void distance::addWordToHash(char *word, int l_pos) {
unsigned int hash = getWordHash(word);
while (vocab_hash[hash] != -1) hash = (hash + 1) % vocab_hash_size;
vocab_hash[hash] = l_pos;
}
