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Gram.cpp
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Gram.cpp
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#include "Gram.hpp"
#include "Word.hpp"
#include "utils/color.hpp"
Gram::Gram(const Word *word, unsigned int depth) :
word(word), depth(depth) {}
const Word *Gram::getWord() const {
return word;
}
const unsigned long Gram::getCount() const {
return count;
}
const double Gram::getProbability() const {
return probability;
}
const std::string Gram::toString() const {
std::stringstream ss;
ss << std::string(depth * 4, ' ') << word->getId() << ":" << word->getOutputText() << " (" << count << "-" << probability << ")" << std::endl;
for (const auto &gram:grams) {
ss << gram.second->toString();
}
return ss.str();
}
const Json::Value Gram::toJson() const {
Json::Value gramJson;
gramJson["word"] = static_cast<Json::UInt64>(word->getId());
gramJson["count"] = static_cast<Json::UInt64>(count);
gramJson["grams"] = Json::Value(Json::arrayValue);
for (auto &gram:grams) {
gramJson["grams"].append(gram.second->toJson());
}
return gramJson;
}
void Gram::fromJson(const Json::Value &gram_json, std::unordered_map<unsigned long, std::unique_ptr<Word>> &wordsById) {
const Json::Value word_json = gram_json["word"];
if (word_json.empty()) {
std::cerr << "Missing gram word" << std::endl;
throw;
}
unsigned long wordId = word_json.asUInt64();
word = wordsById[wordId].get();
const Json::Value count_json = gram_json["count"];
if (count_json.empty()) {
std::cerr << "Missing gram count" << std::endl;
throw;
}
count = count_json.asUInt64();
const Json::Value grams_json = gram_json["grams"];
if (grams_json.empty() || grams_json.type() != Json::arrayValue) {
std::cerr << "Missing gram grams" << std::endl;
throw;
}
for (const auto &i : grams_json) {
std::unique_ptr<Gram> gram(new Gram()); // *new* because of private constructor
gram->depth = depth + 1;
gram->fromJson(i, wordsById);
grams[gram->word->getId()] = std::move(gram);
}
};
void Gram::update(const std::vector<Word *> &sentence, unsigned long position, unsigned long n) {
// We've been seen one more time
++count;
// Go deeper more than one "gram" remaining and not yet at the end of the sentence
position++;
if (n > 1 && position < sentence.size()) {
Gram *gram_ptr;
Word *word = sentence[position];
auto search = grams.find(word->getId());
if (search == grams.end()) {
std::unique_ptr<Gram> gram = std::make_unique<Gram>(word, depth + 1);
gram_ptr = gram.get();
grams[word->getId()] = std::move(gram);
} else {
gram_ptr = search->second.get();
}
gram_ptr->update(sentence, position, n - 1);
}
}
void Gram::computeProbability(unsigned long total) {
probability = (double) count / (double) total;
unsigned long count = 0;
for (const auto &gram:grams) {
count += gram.second->count;
}
for (const auto &gram:grams) {
gram.second->computeProbability(count);
}
}
std::vector<const Gram *> Gram::candidates(const std::vector<const Word *> &sentence, unsigned long position) const {
std::vector<const Gram *> candidates;
if (position < sentence.size()) {
auto search = grams.find(sentence[position]->getId());
if (search != grams.end()) {
candidates = search->second->candidates(sentence, position + 1);
}
} else {
for (const auto &g:grams) {
candidates.push_back(g.second.get());
}
std::sort(
candidates.begin(), candidates.end(),
[](const Gram *a, const Gram *b) {
return a->probability > b->probability;
}
);
}
return candidates;
}
const Gram *Gram::mostProbable(const std::vector<const Word *> &sentence, unsigned long position) const {
const Gram *g{nullptr};
if (position < sentence.size()) {
auto search = grams.find(sentence[position]->getId());
if (search != grams.end()) {
g = search->second->mostProbable(sentence, position + 1);
}
} else {
for (const auto &gram:grams) {
if (gram.second->word->isMarker()) {
continue;
}
if (g == nullptr) {
g = gram.second.get();
} else if (gram.second->probability > g->probability) {
g = gram.second.get();
break;
}
}
}
return g;
}
const Gram *Gram::next(
const std::vector<const Word *> &sentence, unsigned long position,
const std::stack<const Word *> &markerStack, std::vector<const Word *> topic,
bool finishSentence, bool debug
) const {
const Gram *nextGram = nullptr;
if (position < sentence.size()) {
auto search = grams.find(sentence[position]->getId());
if (search != grams.end()) {
if (debug) {
std::cout << std::string(depth + 6, ' ') << "Gram " << Color::FG_CYAN << word->getInputText()
<< Color::FG_DEFAULT << " forwarding to " << Color::FG_CYAN
<< search->second->word->getInputText() << Color::FG_DEFAULT << std::endl;
}
nextGram = search->second->next(sentence, position + 1, markerStack, topic, finishSentence, debug);
} else if (debug) {
std::cout << std::string(depth + 6, ' ') << "Gram " << Color::FG_CYAN << word->getInputText()
<< Color::FG_DEFAULT << " has no follower for " << Color::FG_CYAN
<< sentence[position]->getInputText() << Color::FG_DEFAULT << std::endl;
}
} else {
if (debug) {
std::cout << std::string(depth + 6, ' ') << "Gram " << Color::FG_CYAN << word->getInputText()
<< Color::FG_DEFAULT << " attempting to find a word from:" << std::endl;
for (const auto &gram:grams) {
std::cout << std::string(depth + 7, ' ') << Color::FG_YELLOW
<< std::to_string(gram.second->probability) << Color::FG_DEFAULT << "\t"
<< Color::FG_LIGHT_GRAY << gram.second->word->getInputText() << Color::FG_DEFAULT
<< std::endl;
}
}
// Try finishing the sentence asap
if (finishSentence) {
if (debug) {
std::cout << std::string(depth + 6, ' ')
<< "Trying to finish sentence, giving priority to marker stack: "
<< Color::FG_LIGHT_GRAY << markerStack.top()->getEndMarker()->getInputText()
<< Color::FG_DEFAULT << std::endl;
}
for (const auto &gram:grams) {
if (gram.first == markerStack.top()->getEndMarker()->getId()) {
if (debug) {
std::cout << std::string(depth + 7, ' ') << "Found closing marker "
<< gram.second->word->getInputText() << ", use that instead" << std::endl;
}
return gram.second.get();
}
}
}
double remainingProbability = 1.0;
std::unordered_map<unsigned long, const Gram *> skippedGrams{};
// Try to match the topic
std::vector<const Gram *> topicGrams;
for (const auto &w:topic) {
auto search = grams.find(w->getId());
if (search != grams.end()) {
const Gram *g = w->getGram();
topicGrams.push_back(g);
// Increment maximum probability since we are now adding duplicated to the lot
remainingProbability += g->probability;
}
}
if (debug) {
if (!topicGrams.empty()) {
std::cout << std::string(depth + 6, ' ') << "Topic-matching grams: " << Color::FG_DARK_GRAY;
for (const auto &gram:topicGrams) {
std::cout << gram->word->getInputText() << " ";
}
std::cout << Color::FG_DEFAULT << std::endl;
} else {
std::cout << std::string(depth + 6, ' ') << "No topic-matching grams" << std::endl;
}
}
bool giveUp = false;
do {
std::random_device rd;
std::mt19937 gen(rd());
std::uniform_real_distribution<double> dis(0, remainingProbability);
double rnd = dis(gen);
double probabilities = 0;
// Give more probability to topic grams
for (const auto &gram:topicGrams) {
double probability = gram->probability;
if (probabilities < rnd && rnd <= (probabilities + probability)) {
nextGram = gram;
if (debug) {
std::cout << std::string(depth + 6, ' ') << "Candidate " << Color::FG_YELLOW
<< std::to_string(rnd) << Color::FG_DEFAULT << " "
<< Color::FG_LIGHT_GRAY << nextGram->word->getInputText() << Color::FG_DEFAULT
<< std::endl;
}
break;
}
probabilities += probability;
}
// Do regular grams if no topic gram found
if (nextGram == nullptr) {
for (const auto &gram:grams) {
double probability = gram.second->probability;
if (probabilities < rnd && rnd <= (probabilities + probability)) {
auto search = skippedGrams.find(gram.first);
if (search != skippedGrams.end()) {
// We got a probability match but we already skipped that gram
// so continue to skip adding the probability
continue;
} else {
// We got our gram
nextGram = gram.second.get();
if (debug) {
std::cout << std::string(depth + 6, ' ') << "Candidate " << Color::FG_YELLOW
<< std::to_string(rnd) << Color::FG_DEFAULT << " "
<< Color::FG_LIGHT_GRAY << nextGram->word->getInputText() << Color::FG_DEFAULT
<< std::endl;
}
break;
}
}
probabilities += probability;
}
}
if (nextGram != nullptr && nextGram->word->isMarker()) {
if (finishSentence && nextGram->word->isBeginMarker()) {
if (debug) {
std::cout << std::string(depth + 6, ' ') << Color::FG_RED
<< "Trying to finish sentence, not opening new marker" << Color::FG_DEFAULT
<< std::endl;
}
skippedGrams[nextGram->word->getId()] = nextGram;
remainingProbability -= nextGram->probability;
nextGram = nullptr;
} else if (nextGram->word->isBeginMarker() && nextGram->word->getId() == markerStack.top()->getId()) {
if (debug) {
std::cout << std::string(depth + 6, ' ') << Color::FG_RED << "Can't open stacked marker: "
<< markerStack.top()->getInputText() << Color::FG_DEFAULT << std::endl;
}
skippedGrams[nextGram->word->getId()] = nextGram;
remainingProbability -= nextGram->probability;
nextGram = nullptr;
} else if (nextGram->word->isEndMarker() && nextGram->word->getBeginMarker()->getId() != markerStack.top()->getId()) {
if (debug) {
std::cout << std::string(depth + 6, ' ') << Color::FG_RED
<< "Can't close unstacked marker: "
<< nextGram->word->getInputText() << Color::FG_DEFAULT << std::endl;
}
skippedGrams[nextGram->word->getId()] = nextGram;
remainingProbability -= nextGram->probability;
nextGram = nullptr;
}
}
if (nextGram == nullptr && (grams.size() == skippedGrams.size() || remainingProbability <= 0)) {
giveUp = true;
if (debug) {
if (grams.size() == skippedGrams.size()) {
std::cout << std::string(depth + 6, ' ') << Color::FG_RED
<< "No more grams remaining, giving up!" << Color::FG_DEFAULT << std::endl;
} else if (remainingProbability <= 0) {
std::cout << std::string(depth + 6, ' ') << Color::FG_RED
<< "No more probabilities remaining, giving up!" << Color::FG_DEFAULT << std::endl;
}
}
}
if (debug) {
if (nextGram != nullptr) {
std::cout << std::string(depth + 6, ' ') << "Found " << Color::FG_CYAN
<< nextGram->word->getInputText() << Color::FG_DEFAULT << std::endl;
} else {
std::cout << std::string(depth + 6, ' ') << Color::FG_RED << "Nothing Found!"
<< Color::FG_DEFAULT
<< std::endl;
}
}
} while (nextGram == nullptr && !giveUp);
}
if (debug) {
if (nextGram != nullptr) {
std::cout << std::string(depth + 6, ' ') << "Returning " << Color::FG_CYAN
<< nextGram->word->getInputText() << Color::FG_DEFAULT << std::endl;
} else {
std::cout << std::string(depth + 6, ' ') << Color::FG_RED << "Nothing to return!" << Color::FG_DEFAULT
<< std::endl;
}
}
return nextGram;
}