/**
* Builds VocabularyHolder from VocabCache.
*
* <p>Basically we just ignore tokens, and transfer VocabularyWords, supposing that it's already
* truncated by minWordFrequency.
*
* <p>Huffman tree data is ignored and recalculated, due to suspectable flaw in dl4j huffman impl,
* and it's exsessive memory usage.
*
* <p>This code is required for compatibility between dl4j w2v implementation, and standalone w2v
*
* @param cache
*/
protected VocabularyHolder(@NonNull VocabCache cache, boolean markAsSpecial) {
this.vocabCache = cache;
for (VocabWord word : cache.tokens()) {
VocabularyWord vw = new VocabularyWord(word.getWord());
vw.setCount((int) word.getWordFrequency());
// since we're importing this word from external VocabCache, we'll assume that this word is
// SPECIAL, and should NOT be affected by minWordFrequency
vw.setSpecial(markAsSpecial);
// please note: we don't transfer huffman data, since proper way is to recalculate it after
// new words being added
if (word.getPoints() != null && !word.getPoints().isEmpty()) {
vw.setHuffmanNode(
buildNode(word.getCodes(), word.getPoints(), word.getCodeLength(), word.getIndex()));
}
vocabulary.put(vw.getWord(), vw);
}
// there's no sense building huffman tree just for UNK word
if (numWords() > 1) updateHuffmanCodes();
logger.info("Init from VocabCache is complete. " + numWords() + " word(s) were transferred.");
}
